# Agentropolis

> A search engine for agent-usable tools: MCP servers, x402 and MPP paid HTTP APIs, A2A agents and "kits". 38952 listings. Trust scores come only from verified, non-wash payments. Agentropolis is never a party to transactions: buyers pay sellers directly (x402/Coinbase, MPP, Stripe). No splits, referral fees or proxying.

Search returns organic `results` ranked by relevance and payment-verified trust; Seenly's first-party kits (affiliated) appear only in the labelled `featured_first_party` array. `trust.score: null` means no payment evidence, not a bad tool. Always trust the seller's live HTTP 402 challenge over any listed price. Full reference in one file: https://agentropolis.io/llms-full.txt

## Docs
- [llms-full.txt](https://agentropolis.io/llms-full.txt): this index plus the full reference (API, MCP tools, rules, badges, free allowance, x402 pass-through) and the data behind every topic and comparison page
- [OpenAPI](https://agentropolis.io/openapi.json): REST API (search, listings, kit manifests, stats, reports, badges)
- [MCP server](https://agentropolis.io/api/mcp): Streamable HTTP, no auth, read-only search tools plus call_kit (forwards to an x402 seller, never pays)
- [A2A agent card](https://agentropolis.io/.well-known/agent-card.json): JSON-RPC at https://agentropolis.io/a2a (message/send)
- [API catalog (RFC 9727)](https://agentropolis.io/.well-known/api-catalog)
- [Install](https://agentropolis.io/install): Claude Code, Cursor, VS Code, AI SDK, LangChain, CrewAI, OpenAI Agents SDK
- [Trust method](https://agentropolis.io/api/v1/trust/method): how the 0-100 trust score is computed from wash-filtered on-chain payments
- [kit.json v0.1 schema](https://agentropolis.io/spec/kit-v0.1.json) and [first-party kits index](https://agentropolis.io/.well-known/kits.json)

## Search
- [Search API](https://agentropolis.io/api/v1/search?q=web+search&rail=x402&max_price_usd=0.05&min_trust=40): params q, kind (mcp_server, http_api, a2a_agent, kit), category, rail (x402, mpp, stripe), max_price_usd, min_trust, limit
- [Listing JSON](https://agentropolis.io/api/v1/listings/x402.exa): GET /api/v1/listings/{id}; kit manifest at /api/v1/listings/{id}/kit.json; HTML at /listing/{id}
- [Web search UI](https://agentropolis.io/?q=weather)

## Answers (topic pages from real searches)
- [Agent-to-agent micropayment APIs](https://agentropolis.io/topics/agent-micropayments): Pay-per-call APIs, facilitators and MCP servers that let AI agents pay each other in small amounts, with their payment rail, listed price and payment-verified usage from the Agentropolis index.
- [Nano (XNO) payments for agents](https://agentropolis.io/topics/nano-xno-payments): Listings in the Agentropolis index that accept or work with Nano (XNO) payments, feeless transfers or Nano invoices, with what we can and cannot verify about each. (thin: few listings with evidence yet)
- [SEO and backlink tools agents can use](https://agentropolis.io/topics/seo-backlink-tools-for-agents): MCP servers and pay-per-call APIs for backlink data, keyword research, rank tracking and AI-search visibility, from the Agentropolis index, with remote-endpoint and payment evidence where it exists.
- [Weather APIs for AI agents](https://agentropolis.io/topics/weather-apis-for-ai-agents): Weather and forecast APIs and MCP servers an AI agent can call, ranked by payment-verified usage, with listed prices per call and uptime where measured.

## Comparisons
- [Transcription APIs for AI agents, compared](https://agentropolis.io/compare/best-transcription-apis-for-ai-agents): Speech-to-text and transcription APIs and MCP servers an agent can call, compared on listed price, payment rail and on-chain verified usage. Our own kit, Transcript+, is first-party and shown separately.
- [x402 vs Stripe for agent payments](https://agentropolis.io/compare/x402-vs-stripe-for-agent-payments): How x402 and Stripe machine payments (MPP, cards via Shared Payment Tokens, stablecoins) compare for selling an API to AI agents: published fees, minimum charge, settlement and what the Agentropolis index shows about real usage.
- [Web search for agents: MCP servers vs pay-per-call APIs](https://agentropolis.io/compare/best-mcp-servers-for-web-search): Web search MCP servers (remote endpoints first) and x402 pay-per-call search APIs from the Agentropolis index, compared on connection type, listed price and payment-verified usage.
- [Token safety / honeypot check APIs for agents](https://agentropolis.io/compare/token-safety-check-apis-for-agents): APIs and MCP servers that check an ERC-20 or Solana token for honeypots, rug-pull signals or contract risks before an agent trades, compared on price, rail and verified usage. Our own Token Preflight kit is first-party and shown separately.
- Disclosure: Agentropolis is affiliated with Seenly; Seenly kits on these pages are labelled first-party and never ranked.

## Categories
- [Security & verification](https://agentropolis.io/categories/security-verification): 3,448 listings, 101 with payment-verified usage, median listed price $0.01
- [Crypto & on-chain data](https://agentropolis.io/categories/crypto-onchain-data): 1,798 listings, 70 with payment-verified usage, median listed price $0.01
- [Media: speech, video & image](https://agentropolis.io/categories/media-speech-video-image): 2,153 listings, 44 with payment-verified usage, median listed price $0.01
- [LLM inference](https://agentropolis.io/categories/llm-inference): 2,316 listings, 43 with payment-verified usage, median listed price $0.01
- [People & company enrichment](https://agentropolis.io/categories/people-company-enrichment): 2,094 listings, 38 with payment-verified usage, median listed price $0.008
- [Web search](https://agentropolis.io/categories/web-search): 3,904 listings, 36 with payment-verified usage, median listed price $0.01
- [Scraping & extraction](https://agentropolis.io/categories/scraping-extraction): 1,173 listings, 32 with payment-verified usage, median listed price $0.01
- [Social data](https://agentropolis.io/categories/social-data): 945 listings, 24 with payment-verified usage, median listed price $0.01
- [Finance & markets](https://agentropolis.io/categories/finance-markets): 1,514 listings, 23 with payment-verified usage, median listed price $0.02
- [Compute & infra tools](https://agentropolis.io/categories/compute-infra-tools): 1,977 listings, 9 with payment-verified usage, median listed price $0.0075
- [Reports & research](https://agentropolis.io/categories/reports-research-intel): 931 listings, 7 with payment-verified usage, median listed price $0.01
- [Travel](https://agentropolis.io/categories/travel): 502 listings, 7 with payment-verified usage, median listed price $0.01
- [Off-ramp, gift cards & payouts](https://agentropolis.io/categories/offramp-giftcards-payouts): 74 listings, 4 with payment-verified usage, median listed price $0.02
- [All categories](https://agentropolis.io/categories) (thin categories are listed there but not indexed)

## Market data (wash-filtered; data: x402-list.com CC BY 4.0)
- [Live stats](https://agentropolis.io/stats): JSON https://agentropolis.io/api/v1/stats ; chart https://agentropolis.io/stats/chart.svg
- [State of paid agent tools, 2026-40](https://agentropolis.io/reports/2026-40): JSON https://agentropolis.io/api/v1/reports/2026-40
- [All reports](https://agentropolis.io/reports) ; [RSS](https://agentropolis.io/reports/rss.xml)

## Sellers
- [Claim a listing](https://agentropolis.io/sellers): email sign-in; verify via /.well-known/agent-hub-verify.txt, DNS TXT or email at your domain
- [Badges](https://agentropolis.io/badges): Verified, Live-Tested, Trusted (earned); Agentropolis Pro (paid, coming soon, no charges enabled)

## Optional
- [Sources and terms](https://agentropolis.io/sources) ; JSON https://agentropolis.io/api/v1/sources
- [Privacy](https://agentropolis.io/privacy): no raw IPs; bots and crawlers are labelled and excluded from seller stats
- [Roadmap](https://agentropolis.io/roadmap) ; [Business model](https://agentropolis.io/api/v1/business-model)
- [Examples repo](https://github.com/seenly721/agentropolis-examples)
- Contact: hello@agentropolis.io (read by a human)

---

# Full reference

## Use it
- Search (HTTP): GET https://agentropolis.io/api/v1/search?q=web+search&rail=x402&max_price_usd=0.05&min_trust=40
- MCP server (Streamable HTTP): https://agentropolis.io/api/mcp  (no auth; 10 tools: search_kits, get_kit, get_kit_manifest, call_kit, list_categories, list_sources, get_trust_method, get_bazaar_link, get_market_snapshot, get_roadmap; all read-only except call_kit, which forwards a request to an x402 seller and never pays by itself. Old names trust_method, bazaar_link, market_snapshot, roadmap still work.)
- A2A agent card: https://agentropolis.io/.well-known/agent-card.json ; JSON-RPC endpoint https://agentropolis.io/a2a (message/send)
- OpenAPI: https://agentropolis.io/openapi.json ; API catalog (RFC 9727): https://agentropolis.io/.well-known/api-catalog
- Listing: GET https://agentropolis.io/api/v1/listings/{id} ; kit manifest: GET https://agentropolis.io/api/v1/listings/{id}/kit.json
- kit.json v0.1 schema: https://agentropolis.io/spec/kit-v0.1.json ; first-party kits index: https://agentropolis.io/.well-known/kits.json

## Install (free, no auth)
- Claude Code: claude mcp add --transport http agentropolis https://agentropolis.io/api/mcp
- Cursor (one click): https://cursor.com/en/install-mcp?name=agentropolis&config=eyJ1cmwiOiJodHRwczovL2FnZW50cm9wb2xpcy5pby9hcGkvbWNwIn0%3D
- VS Code (one click): https://insiders.vscode.dev/redirect/mcp/install?name=agentropolis&config=%7B%22type%22%3A%22http%22%2C%22url%22%3A%22https%3A%2F%2Fagentropolis.io%2Fapi%2Fmcp%22%7D
- Any MCP client (mcp.json): {"mcpServers":{"agentropolis":{"url":"https://agentropolis.io/api/mcp"}}}
- Snippets for Vercel AI SDK, LangChain, CrewAI, OpenAI Agents SDK: https://agentropolis.io/install
- Examples repo: https://github.com/seenly721/agentropolis-examples (Runnable, tested examples (MIT) for Vercel AI SDK, LangChain, CrewAI, OpenAI Agents SDK and Coinbase AgentKit: connect to the MCP server, search, and pay a kit via x402 with your own wallet (key from an env var).)
```ts
import { createMCPClient } from '@ai-sdk/mcp';
import { generateText } from 'ai';

const mcp = await createMCPClient({ transport: { type: 'http', url: 'https://agentropolis.io/api/mcp' } });
try {
  const { text } = await generateText({
    model: 'openai/gpt-5-mini', // any AI SDK model
    tools: await mcp.tools(),
    prompt: 'Find an x402 web search API under $0.01 per call with verified buyers.',
  });
  console.log(text);
} finally {
  await mcp.close();
}
```
```python
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain.agents import create_agent

client = MultiServerMCPClient({
    "agentropolis": {"transport": "streamable_http", "url": "https://agentropolis.io/api/mcp"}
})
tools = await client.get_tools()
agent = create_agent("openai:gpt-5-mini", tools)
result = await agent.ainvoke({"messages": [{"role": "user", "content": "Find an MCP server for Postgres"}]})
```

## Market data (wash-filtered; data: x402-list.com CC BY 4.0)
- Live stats: https://agentropolis.io/stats (JSON https://agentropolis.io/api/v1/stats) ; embeddable chart https://agentropolis.io/stats/chart.svg
- Weekly report "State of paid agent tools": https://agentropolis.io/reports (latest https://agentropolis.io/reports/latest, RSS https://agentropolis.io/reports/rss.xml, JSON https://agentropolis.io/api/v1/reports)
- Category pages with prices and verified buyers: https://agentropolis.io/categories (e.g. https://agentropolis.io/categories/web-search)
- Caveat: verified buyers are summed per service (one wallet paying several services counts once per service).

## Rules agents should know
- Seeded listings are "unclaimed": built from public metadata, not reviewed by the seller.
- First-party kits ("Featured from Seenly", an affiliated publisher) appear only in "featured_first_party" (labeled), never inside organic "results".
- "featured" is a separate, labelled array of Agentropolis Pro listings (today only our first-party showcase kits). "sponsored" is always a separate array (currently empty). Paid placement never changes organic rank or trust.
- trust.score null = no payment evidence (not negative). Method: https://agentropolis.io/api/v1/trust/method
- Always trust the seller's live 402 challenge over any listed price.
- Coinbase Bazaar / Agentic.Market: link-out only (their terms forbid caching/aggregation).

## Sources (terms-checked): https://agentropolis.io/api/v1/sources
Official MCP Registry (CC0) · tempoxyz/mpp services registry (MIT/Apache-2.0) · Data: x402-list.com (CC BY 4.0) · seller origins (robots-aware discovery files) · first-party kits (Seenly, affiliated)

## Buy here (x402 pass-through, non-custodial)
- Listings with links.call support https://agentropolis.io/api/v1/call/{id}?endpoint=/path : send the request as you would to the seller. On 402 you get the seller's requirements unchanged; pay the seller's payTo from your own wallet and retry with X-PAYMENT (v1) or PAYMENT-SIGNATURE (v2). Settlement comes back in PAYMENT-RESPONSE / X-PAYMENT-RESPONSE.
- Same via MCP tool call_kit and A2A skill call_kit. Agentropolis holds no keys or funds, never edits payTo/amount, never settles, charges no fees. Card-only listings: link out.
- Limits: https sellers on the listing's own host only, 256 KB request, 2 MB response, 25 s timeout, 20 calls/min per client.

## Free daily allowance on Seenly's first-party kits (opt-in)
- pitch-kit: 3 free calls per caller network (IPv4 /24, IPv6 /64) per UTC day, global cap 5/day (POST /api/script)
- transcript-plus: 3 free calls per caller network (IPv4 /24, IPv6 /64) per UTC day, global cap 10/day, audio up to 2 min (POST /api/transcribe, audio up to 2 min)
- token-preflight: 3 free calls per caller network (IPv4 /24, IPv6 /64) per UTC day, global cap 50/day (POST/GET /api/token-preflight)
- Opt in per request with header "X-Free-Allowance: use" (or ?free=1) on a valid request sent directly to the kit. Without it you always get the normal x402 402.
- Granted: 200 + X-Free-Allowance header + free_allowance block, no payment. Used up: the normal x402 402 with free_allowance.status (caller_limit / global_limit).
- Free calls are never sales: no settlement, never counted in trust, stats, reports or badges. Calls through the Agentropolis relay (call_kit, /api/v1/call) always use x402.
- Settings JSON: https://agentropolis.io/api/internal/free-allowance (worst-case total free cost ~$0.135/day)

## Badges (https://agentropolis.io/badges ; JSON: https://agentropolis.io/api/v1/badges)
- Verified (earned): claimed listing with domain proof (first-party kits: operator-owned domain).
- Live-Tested (earned): Agentropolis check in the last 24 h found the discovery file and a valid 402 challenge matching the published offer, plus a verified on-chain paid call in the last 30 days (test purchases count here, not toward trust). Small organic boost (x1.1).
- Trusted (earned): trust score from independent on-chain settlements (>= 3 outside buyers, >= 5 settlements in 30 days). Self/operator test purchases never count.
- Agentropolis Pro (paid, coming soon; contact hello@agentropolis.io; no charges enabled): labelled "featured" row in search. Our own kits show it as "Pro · first-party showcase" (no fee paid, no independent sales claimed).
- Every listing: tiers in search results, /api/v1/listings/{id}, MCP get_kit/search_kits and A2A. HTML page: https://agentropolis.io/listing/{id}
- Embeddable SVG: https://agentropolis.io/badge/{id}.svg  e.g. [![Agentropolis](https://agentropolis.io/badge/seenly.seenly-pitch-kit.svg)](https://agentropolis.io/listing/seenly.seenly-pitch-kit)

## Sellers
Claim a listing at https://agentropolis.io/sellers (email sign-in; verify via /.well-known/agent-hub-verify.txt, DNS TXT, or email at your domain). Basic stats for claimed listings.

## Privacy
Searches and click-throughs (results[].links.go) are logged without raw IPs (daily-rotating salted hash). https://agentropolis.io/privacy

## Roadmap (stubs return 501): https://agentropolis.io/api/v1/roadmap
Sellers: Agentropolis Pro (coming soon), advanced analytics, kit builder. Buyers: premium tier with private catalogs and spend controls. Market data reports (free preview at https://agentropolis.io/api/v1/market/reports). Sponsored placement (labeled). Business model: https://agentropolis.io/api/v1/business-model

## Opt-out / corrections
Sellers who want a listing removed or corrected: claim it at https://agentropolis.io/sellers or email hello@agentropolis.io.

## Contact
hello@agentropolis.io (read by a human; no auto-replies)

## Trust method (hub-trust-v0.1)
{
 "method": "hub-trust-v0.1",
 "inputs": "Only verified, non-wash payments: x402-list.com on-chain measured USDC settlements (30d) per service (CC BY 4.0), plus settlements Agentropolis verified itself by reading Base receipts to a payTo the seller published. No directory popularity counters, reviews, or paid inputs.",
 "exclusions": [
  "one_buyer_>=80pct_of_volume (>=10 settlements)",
  "<=2_buyers_with_>=$50",
  "calls_per_buyer_<=1.5_wallet_farm_pattern (>=50 buyers)",
  "purchases by the seller's, the operator's or Agentropolis's own wallets (disclosed as test sales, never counted)"
 ],
 "watch": [
  "watch:many_low_value_buyers (>=500 buyers, < $0.10 per buyer): shown, score capped at 80"
 ],
 "score": "0-100 = 60 x min(1, log10(1+buyers)/2) + 20 x min(1, log10(1+settlements)/4) + 20 x (1 - top_buyer_share) [halved if payout wallet is shared]. null when there is no evidence or wash signals are present. Agentropolis-verified evidence with < 3 buyers or < 5 settlements is capped at 25 (low sample).",
 "null_means": "No payment evidence yet (most MCP servers and MPP-only services). Not a negative signal.",
 "caveats": [
  "Flags are signals, not accusations.",
  "Sybil farms using many funded fresh wallets can still pass; on-chain funding-source clustering is on the roadmap.",
  "Listings without x402 settlements (most MCP servers, MPP-only services) have no score yet."
 ],
 "provenance": "Rules reused from the Agentropolis agent-payments tracker (x402-list filters) plus the calls-per-payer farm test."
}

## Topic and comparison pages: full data
Order on every page: payment-verified trust, then verified buyers, then a published remote endpoint, then a listed price, then the lowest price. No ratings or reviews exist on Agentropolis.

### Agent-to-agent micropayment APIs
URL: https://agentropolis.io/topics/agent-micropayments (updated 2026-10-03)

Agents that pay other agents need a rail that works for sub-cent amounts without a checkout page. In the Agentropolis index the main machine-payment rails are x402 (HTTP 402 plus a stablecoin payment, usually USDC on Base) and MPP (the Machine Payments Protocol).
Below are real listings that describe agent payments, micropayments, payment settlement or facilitation. Each row shows the rail and listed price the seller published and, where it exists, on-chain usage measured by x402-list.com. A blank trust score means no payment evidence yet, not a bad service.

Why this page exists: An outside agent asked Agentropolis on Oct 3, 2026 to “find an API that settles agent-to-agent micro-payments free and instantly” and to say which payment rail each result uses.

Payment and settlement APIs for agents:
1. vaaya [Pay-per-call API] https://agentropolis.io/listing/x402.vaaya | price $0.01–$2.00 per call | rail x402 | trust 89 | verified buyers 30d 89
2. AsterPay [Pay-per-call API] https://agentropolis.io/listing/x402.asterpay | price $0.001–$0.01 per call | rail x402 | trust 49 | verified buyers 30d 9
3. x402dir Facilitator Recommend [Pay-per-call API] https://agentropolis.io/listing/x402.x402dir-facilitator-recommend | price $0.001 per call | rail x402 | trust 36 | verified buyers 30d 4
4. Horizon Pulse [Pay-per-call API] https://agentropolis.io/listing/x402.horizon-pulse | price $0.005–$0.04 per call | rail x402 | trust 33 | verified buyers 30d 4
5. agent-dust [Pay-per-call API] https://agentropolis.io/listing/x402.agent-dust | price $0.005–$0.02 per call | rail x402 | trust none | verified buyers 30d 0
6. Permit Verdict Settlement Oracle [Pay-per-call API] https://agentropolis.io/listing/x402.permit-verdict-settlement-oracle | price $0.01–$0.25 per call | rail x402 | trust none | verified buyers 30d 0
7. LedgerProof Settlement Army [Pay-per-call API] https://agentropolis.io/listing/x402.ledgerproof-settlement-army | price $0.05 per call | rail x402 | trust none | verified buyers 30d 0
8. PayAI x402 Facilitator [MCP server] https://agentropolis.io/listing/mcp.network-payai-facilitator | price n/a | rail n/a | trust none | verified buyers 30d n/a
9. Vermarco [MCP server] https://agentropolis.io/listing/mcp.com-vermarco-marketplace | price n/a | rail n/a | trust none | verified buyers 30d n/a
10. BentCrypto Machine Payments [MCP server] https://agentropolis.io/listing/mcp.io-github-ghstaking-bentcrypto-machine-payments | price n/a | rail n/a | trust none | verified buyers 30d n/a
11. Stabledrop escrow payments [MCP server] https://agentropolis.io/listing/mcp.me-stabledrop-escrow-payments | price n/a | rail n/a | trust none | verified buyers 30d n/a
12. AgentPay x402 Facilitator [MCP server] https://agentropolis.io/listing/mcp.com-x402-agent-pay-facilitator | price n/a | rail n/a | trust none | verified buyers 30d n/a
13. Neuronto Payments: x402 facilitator [MCP server] https://agentropolis.io/listing/mcp.com-neuronto-x402-payments-facilitator | price n/a | rail n/a | trust none | verified buyers 30d n/a
14. MCPVOT — x402 Facilitator Machine [MCP server] https://agentropolis.io/listing/mcp.io-github-mcpvot-mcpvot | price n/a | rail n/a | trust none | verified buyers 30d n/a
15. merona — x402 settlement index [MCP server] https://agentropolis.io/listing/mcp.io-merona-settlement-index | price n/a | rail n/a | trust none | verified buyers 30d n/a

Sources:
[1] x402-list.com on-chain measured settlements (CC BY 4.0), used for payment-verified trust and verified buyers: https://x402-list.com
[2] Official MCP Registry (CC0 1.0): https://registry.modelcontextprotocol.io
[3] Agentropolis trust method hub-trust-v0.1: https://agentropolis.io/api/v1/trust/method
[4] x402 protocol (x402 Foundation): https://www.x402.org
[5] Coinbase CDP x402 facilitator pricing: https://docs.cdp.coinbase.com/x402/seller/facilitator

### Nano (XNO) payments for agents
URL: https://agentropolis.io/topics/nano-xno-payments (updated 2026-10-03; thin: 5 relevant listing(s), 0 with a price or payment evidence (needs 5+ and 3+))

Nano (XNO) is a feeless cryptocurrency, which makes it interesting for very small agent payments. Agentropolis measures payments only on x402 rails today, so Nano usage below is not payment-verified: rows show what sellers publish.
We only list services whose own description mentions Nano or XNO. Several popular results for “nano” are unrelated (image models named “Nano Banana”, Nano ID libraries) and are excluded.

Why this page exists: An outside agent searched Agentropolis on Oct 3, 2026 for nano, nano-invoice, XNO, nano-finality, nano-mcp, nanswap and subnano; several of those searches returned nothing relevant.

Services that mention Nano / XNO:
1. Nagora [MCP server] https://agentropolis.io/listing/mcp.shop-nagora-nagora | price n/a | rail n/a | trust none | verified buyers 30d n/a
2. com.feeless402/nano-pay [MCP server] https://agentropolis.io/listing/mcp.com-feeless402-nano-pay | price n/a | rail n/a | trust none | verified buyers 30d n/a
3. Vend API Merchant [Pay-per-call API] https://agentropolis.io/listing/x402.vend-api-merchant-mub57rxj-0 | price n/a | rail x402 | trust none | verified buyers 30d n/a
4. Feeless402 [Pay-per-call API] https://agentropolis.io/listing/x402.feeless402 | price n/a | rail x402 | trust none | verified buyers 30d n/a
5. Document Analysis & OCR — Micropayment, No Transfer Fee [Pay-per-call API] https://agentropolis.io/listing/x402.document-analysis-ocr-micropayment-no-transfer-fee | price n/a | rail x402 | trust none | verified buyers 30d n/a

Sources:
[1] x402-list.com on-chain measured settlements (CC BY 4.0), used for payment-verified trust and verified buyers: https://x402-list.com
[2] Official MCP Registry (CC0 1.0): https://registry.modelcontextprotocol.io
[3] Agentropolis trust method hub-trust-v0.1: https://agentropolis.io/api/v1/trust/method
[4] Nano (XNO) project: https://nano.org

### SEO and backlink tools agents can use
URL: https://agentropolis.io/topics/seo-backlink-tools-for-agents (updated 2026-10-03)

These are tools an agent can call directly for SEO work: backlink lookups, keyword and SERP data, site audits and visibility in AI answers. Most are MCP servers from the Official MCP Registry; where a remote endpoint is published you can connect without installing anything.
Agentropolis does not rate SEO agencies or services, and none of these listings have payment-verified usage yet unless a trust score is shown.

Why this page exists: Searches on Agentropolis on Oct 2, 2026 included “backlinks” and “the Profound agency” (an AI-search visibility company). Profound itself is not in our index.

SEO and backlink tools:
1. ForgeMesh SEO Authority [Pay-per-call API] https://agentropolis.io/listing/x402.forgemesh-seo-authority | price $0.005–$0.02 per call | rail x402 | trust 45 | verified buyers 30d 7
2. Google Trends SEO Keyword Data [Pay-per-call API] https://agentropolis.io/listing/x402.google-trends-seo-keyword-data | price $0.03–$0.05 per call | rail x402 | trust none | verified buyers 30d 25
3. Citable [Pay-per-call API] https://agentropolis.io/listing/x402.citable | price $0.005–$0.30 per call | rail x402 | trust none | verified buyers 30d 0
4. Seo Backlinks [MCP server] https://agentropolis.io/listing/mcp.io-github-pipeworx-io-seo-backlinks | price n/a | rail n/a | trust none | verified buyers 30d n/a
5. AIsa Backlinks [MCP server] https://agentropolis.io/listing/mcp.one-aisa-seo-backlinks | price n/a | rail n/a | trust none | verified buyers 30d n/a
6. AIsa SEO & AI Visibility [MCP server] https://agentropolis.io/listing/mcp.one-aisa-seo | price n/a | rail n/a | trust none | verified buyers 30d n/a
7. Visibly AI — SEO MCP Server [MCP server] https://agentropolis.io/listing/mcp.io-github-antonioblago-visibly-ai | price n/a | rail n/a | trust none | verified buyers 30d n/a
8. com.superagnt/seo-data [MCP server] https://agentropolis.io/listing/mcp.com-superagnt-seo-data | price n/a | rail n/a | trust none | verified buyers 30d n/a
9. Miraqo [MCP server] https://agentropolis.io/listing/mcp.io-github-deleteweb-seo | price n/a | rail n/a | trust none | verified buyers 30d n/a
10. Ubersuggest [MCP server] https://agentropolis.io/listing/mcp.com-neilpatelapi-ubersuggest | price n/a | rail n/a | trust none | verified buyers 30d n/a
11. VibeSEO [MCP server] https://agentropolis.io/listing/mcp.dev-vibeseo-vibeseo | price n/a | rail n/a | trust none | verified buyers 30d n/a
12. BlogSEO [MCP server] https://agentropolis.io/listing/mcp.io-blogseo-blogseo | price n/a | rail n/a | trust none | verified buyers 30d n/a
13. GoAnyAPI MCP [MCP server] https://agentropolis.io/listing/mcp.com-goanyapi-goanyapi-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
14. SearcherLite [MCP server] https://agentropolis.io/listing/mcp.com-searcherlite-searcherlite | price n/a | rail n/a | trust none | verified buyers 30d n/a
15. Vouched [MCP server] https://agentropolis.io/listing/mcp.com-vouchedhq-vouched | price n/a | rail n/a | trust none | verified buyers 30d n/a
16. SE Ranking [MCP server] https://agentropolis.io/listing/mcp.com-seranking-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
17. Robot Speed [MCP server] https://agentropolis.io/listing/mcp.io-github-robot-speed-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
18. com.harborrank/harborrank [MCP server] https://agentropolis.io/listing/mcp.com-harborrank-harborrank | price n/a | rail n/a | trust none | verified buyers 30d n/a
19. Nautilinks Backlinks [MCP server] https://agentropolis.io/listing/mcp.co-nautilinks-nautilinks-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
20. io.github.alordincans/rankdelta [MCP server] https://agentropolis.io/listing/mcp.io-github-alordincans-rankdelta | price n/a | rail n/a | trust none | verified buyers 30d n/a
21. TransformSEO [MCP server, multi-endpoint] https://agentropolis.io/listing/mcp.com-gettransformseo-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
22. io.github.abhibavishi/rankparse-mcp [MCP server, multi-endpoint] https://agentropolis.io/listing/mcp.io-github-abhibavishi-rankparse-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
23. ClearPost: WordPress SEO Agent [MCP server, multi-endpoint] https://agentropolis.io/listing/mcp.com-clearpostplugin-wordpress-seo | price n/a | rail n/a | trust none | verified buyers 30d n/a

Sources:
[1] x402-list.com on-chain measured settlements (CC BY 4.0), used for payment-verified trust and verified buyers: https://x402-list.com
[2] Official MCP Registry (CC0 1.0): https://registry.modelcontextprotocol.io
[3] Agentropolis trust method hub-trust-v0.1: https://agentropolis.io/api/v1/trust/method

### Weather APIs for AI agents
URL: https://agentropolis.io/topics/weather-apis-for-ai-agents (updated 2026-10-03)

For current conditions and multi-day forecasts an agent can either use an MCP server or pay per call over x402 with no API key. The table puts services with real, wash-filtered on-chain usage first.
Verified buyers are counted per service; one wallet that pays several services counts once for each. Some services share a payout wallet with other services, which we flag.

Why this page exists: Weather is one of the most frequent searches on Agentropolis; on Oct 3, 2026 an outside A2A agent asked for “current weather conditions and 7-day forecast” APIs.

Pay-per-call weather APIs (x402):
1. Hugen Weather API [Pay-per-call API] https://agentropolis.io/listing/x402.hugen-weather-api | price $0.01 per call | rail x402 | trust 84 | verified buyers 30d 397
2. LoneStarOracle WeatherOracle [Pay-per-call API] https://agentropolis.io/listing/x402.lonestaroracle-weatheroracle | price $0.02 per call | rail x402 | trust 64 | verified buyers 30d 35
3. VWeatherStation [Pay-per-call API] https://agentropolis.io/listing/x402.vweatherstation | price $0.01–$0.08 per call | rail x402 | trust 40 | verified buyers 30d 6
4. Clink Forge [Pay-per-call API] https://agentropolis.io/listing/x402.clink-forge | price $0.001–$0.02 per call | rail x402 | trust 27 | verified buyers 30d 4
5. ForgeMesh Travel Agent [Pay-per-call API] https://agentropolis.io/listing/x402.forgemesh-travel-agent | price $0.01–$0.25 per call | rail x402 | trust none | verified buyers 30d 8
6. Polyform [Pay-per-call API] https://agentropolis.io/listing/x402.polyform | price $0.001–$0.50 per call | rail x402 | trust none | verified buyers 30d 2
7. Japan Weather Forecast & Warnings API [Pay-per-call API] https://agentropolis.io/listing/x402.japan-weather-forecast-warnings-api | price $0.001–$0.005 per call | rail x402 | trust none | verified buyers 30d 0
8. Weather [Pay-per-call API] https://agentropolis.io/listing/x402.weather | price $0.0018–$2.67 per call | rail x402 | trust none | verified buyers 30d 0
9. Aviation x402 [Pay-per-call API] https://agentropolis.io/listing/x402.aviation-x402 | price $0.0018–$2.63 per call | rail x402 | trust none | verified buyers 30d 0
10. GISGP x402 Hazard API [Pay-per-call API] https://agentropolis.io/listing/x402.gisgp-x402-hazard-api | price $0.20 per call | rail x402 | trust none | verified buyers 30d 0
11. Otto AI [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.otto-ai | price $0.001–$1.75 per call | rail x402 | trust 93 | verified buyers 30d 467
12. Vibe Springs [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.vibe-springs | price $0.002–$0.15 per call | rail x402 | trust 87 | verified buyers 30d 110
13. 2s.io [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.2s-io | price $0.0025–$0.009 per call | rail x402 | trust 86 | verified buyers 30d 89
14. MicroTap [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.x402tap | price $0.001–$0.05 per call | rail x402 | trust 78 | verified buyers 30d 49
15. SuVerse Pay [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.suverse-pay | price $0.001–$0.10 per call | rail x402 | trust 55 | verified buyers 30d 20
16. Invoket [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.invoket | price $0.01–$0.25 per call | rail x402 | trust 51 | verified buyers 30d 10

Weather MCP servers:
1. Weather Forecast MCP [MCP server] https://agentropolis.io/listing/mcp.cn-pianam-mcp-weather-mcp-china | price n/a | rail n/a | trust none | verified buyers 30d n/a
2. Weather API [MCP server] https://agentropolis.io/listing/mcp.io-github-br0ski777-weather-api | price n/a | rail n/a | trust none | verified buyers 30d n/a
3. NordicMCP — Weather [MCP server] https://agentropolis.io/listing/mcp.eu-nordicmcp-weather | price n/a | rail n/a | trust none | verified buyers 30d n/a
4. GribStream Weather MCP [MCP server] https://agentropolis.io/listing/mcp.com-gribstream-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
5. Weather & Climate Intelligence MCP [MCP server] https://agentropolis.io/listing/mcp.io-github-foundrynet-weather-intel-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
6. Weather & Geo Intel MCP [MCP server] https://agentropolis.io/listing/mcp.com-datakoot-us-weather-forecast-alerts | price n/a | rail n/a | trust none | verified buyers 30d n/a
7. Open Meteo [MCP server] https://agentropolis.io/listing/mcp.io-github-pipeworx-io-open-meteo | price n/a | rail n/a | trust none | verified buyers 30d n/a
8. ai.smithery/smithery-ai-national-weather-service [MCP server] https://agentropolis.io/listing/mcp.ai-smithery-smithery-ai-national-weather-service | price n/a | rail n/a | trust none | verified buyers 30d n/a
9. io.github.cyanheads/open-meteo-mcp-server [MCP server] https://agentropolis.io/listing/mcp.io-github-cyanheads-open-meteo-mcp-server | price n/a | rail n/a | trust none | verified buyers 30d n/a
10. Weather MCP [MCP server] https://agentropolis.io/listing/mcp.io-github-kulybaba-weather | price n/a | rail n/a | trust none | verified buyers 30d n/a
11. Pirate Weather [MCP server] https://agentropolis.io/listing/mcp.io-github-pipeworx-io-pirate-weather | price n/a | rail n/a | trust none | verified buyers 30d n/a
12. Weather [MCP server] https://agentropolis.io/listing/mcp.io-github-pipeworx-io-weather | price n/a | rail n/a | trust none | verified buyers 30d n/a

Sources:
[1] x402-list.com on-chain measured settlements (CC BY 4.0), used for payment-verified trust and verified buyers: https://x402-list.com
[2] Official MCP Registry (CC0 1.0): https://registry.modelcontextprotocol.io
[3] Agentropolis trust method hub-trust-v0.1: https://agentropolis.io/api/v1/trust/method

### Transcription APIs for AI agents, compared
URL: https://agentropolis.io/compare/best-transcription-apis-for-ai-agents (updated 2026-10-03)

“Best” here means a transparent order, not an editorial opinion: services with payment-verified trust (wash-filtered on-chain payments) first, then more verified buyers, then services with a listed price, then the lowest listed price.
Disclosure: Transcript+ is a first-party kit published by Seenly, which is affiliated with Agentropolis. It is listed in its own labelled block and is not part of the ranking.

Why this page exists: Transcription is a recurring search on Agentropolis (web, API, MCP and A2A).

First-party (Seenly, affiliated; not ranked):
- Transcript+: transcripts with speakers, summary and captions (https://agentropolis.io/listing/seenly.seenly-transcript-plus): $0.01 USDC per audio minute on Base via x402

Transcription and speech-to-text listings:
1. bozaaagh paid micro-API [Pay-per-call API] https://agentropolis.io/listing/x402.bozaaagh-paid-micro-api | price $0.01–$0.05 per call | rail x402 | trust 12 | verified buyers 30d 1
2. Transcribe — audio to transcript, subtitles and a cut list [Pay-per-call API] https://agentropolis.io/listing/x402.transcribe-audio-to-transcript-subtitles-and-a-cut-list | price $0.05 per call | rail x402 | trust 11 | verified buyers 30d 1
3. NeuroDynamic Audio [Pay-per-call API] https://agentropolis.io/listing/x402.neurodynamic-audio | price $0.005–$0.01 per call | rail x402 | trust none | verified buyers 30d 6
4. x402 Voice-to-Text [Pay-per-call API] https://agentropolis.io/listing/x402.x402-voice-to-text | price $0.01 per call | rail x402 | trust none | verified buyers 30d 0
5. Ausca [Pay-per-call API] https://agentropolis.io/listing/x402.ausca | price $0.05–$0.40 per call | rail x402 | trust none | verified buyers 30d 0
6. Bulk Transcription: Audio & Video to Text from CSV or Sheet [MCP server] https://agentropolis.io/listing/mcp.io-github-nero-engine-bulk-transcription | price n/a | rail n/a | trust none | verified buyers 30d n/a
7. com.scriptivox.www/transcription [MCP server] https://agentropolis.io/listing/mcp.com-scriptivox-www-transcription | price n/a | rail n/a | trust none | verified buyers 30d n/a
8. Vibe2Text — AI audio & video transcription with speaker diarization [MCP server] https://agentropolis.io/listing/mcp.ru-vibe2text-vibe2text | price n/a | rail n/a | trust none | verified buyers 30d n/a
9. FieldTranscript [MCP server] https://agentropolis.io/listing/mcp.com-fieldtranscript-transcriber | price n/a | rail n/a | trust none | verified buyers 30d n/a
10. AudioPod AI [MCP server] https://agentropolis.io/listing/mcp.ai-audiopod-audiopod | price n/a | rail n/a | trust none | verified buyers 30d n/a
11. Kooma — Bambara AI [MCP server] https://agentropolis.io/listing/mcp.ai-kooma-kooma | price n/a | rail n/a | trust none | verified buyers 30d n/a
12. Transkriba — Russian audio transcription [MCP server] https://agentropolis.io/listing/mcp.ru-transkriba-transcription | price n/a | rail n/a | trust none | verified buyers 30d n/a
13. RiverScript [MCP server] https://agentropolis.io/listing/mcp.com-riverscript-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
14. Voibe [MCP server] https://agentropolis.io/listing/mcp.com-getvoibe-transcription | price n/a | rail n/a | trust none | verified buyers 30d n/a
15. Speech to Text (Whisper) for Audio and Video URLs [MCP server] https://agentropolis.io/listing/mcp.io-github-saulius876-lgtm-speech-to-text | price n/a | rail n/a | trust none | verified buyers 30d n/a
16. Gambit [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.gambit | price $0.03–$180.00 per call | rail x402 | trust 11 | verified buyers 30d 1
17. AgisHub [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.agishub | price $0.001–$0.10 per call | rail x402 | trust none | verified buyers 30d 4
18. io.github.CSOAI-ORG/voice-audio-mcp [MCP server, multi-endpoint] https://agentropolis.io/listing/mcp.io-github-csoai-org-voice-audio-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
19. OpenAI [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/mpp.openai | price n/a | rail mpp | trust none | verified buyers 30d n/a

Sources:
[1] x402-list.com on-chain measured settlements (CC BY 4.0), used for payment-verified trust and verified buyers: https://x402-list.com
[2] Official MCP Registry (CC0 1.0): https://registry.modelcontextprotocol.io
[3] Agentropolis trust method hub-trust-v0.1: https://agentropolis.io/api/v1/trust/method

### x402 vs Stripe for agent payments
URL: https://agentropolis.io/compare/x402-vs-stripe-for-agent-payments (updated 2026-10-03)

Both let an API answer an agent with HTTP 402 and get paid without a checkout page. x402 is an open protocol where the agent signs a stablecoin payment that a facilitator settles on-chain to your wallet. Stripe’s machine payments settle into your Stripe balance in fiat and support MPP (co-authored by Stripe and Tempo) with cards or stablecoins, and x402 on Base.
Fees and limits below are copied from each provider’s public pricing and docs as checked on Oct 3, 2026 (US list prices); check the linked pages before deciding. Agentropolis is a search engine and is not a party to either.

Why this page exists: Payment-rail questions are common in Agentropolis A2A and API searches; the index tracks both x402 and MPP listings.

Published terms (as checked Oct 3, 2026):
- What it is: x402 (CDP facilitator): Open protocol (x402 Foundation, Linux Foundation); many facilitators | Stripe machine payments: Stripe product supporting MPP and x402
- Fees: x402 (CDP facilitator): First 1,000 on-chain facilitator transactions per month free, then $0.001 each; verification free | Stripe machine payments: Stablecoins 1.5% list rate (0.8% promotional rate shown through Jan 1, 2027); cards 2.9% + 30¢ (US domestic)
- Minimum charge: x402 (CDP facilitator): Any amount you price; the fee is per on-chain transaction, and batch-settlement can settle thousands of payments in one | Stripe machine payments: 0.01 USDC for stablecoins; $0.50 for cards via Shared Payment Tokens
- Where money lands: x402 (CDP facilitator): Your own wallet, on-chain (USDC) | Stripe machine payments: Your Stripe balance, settled in fiat
- Networks: x402 (CDP facilitator): Base, Polygon, Arbitrum, World, Solana (CDP) | Stripe machine payments: x402 on Base (USDC); MPP with stablecoins or cards via Shared Payment Tokens
- Refunds and disputes: x402 (CDP facilitator): No chargebacks; refunds are a new transfer you send | Stripe machine payments: Refunds via API/Dashboard; card disputes $15 each
- Availability: x402 (CDP facilitator): Anyone with a wallet (the CDP facilitator needs a CDP API key; other facilitators exist) | Stripe machine payments: US businesses; stablecoin acceptance in all states except New York

- Fees, by the published numbers: up to 1,000 on-chain settlements a month the CDP facilitator costs nothing. Above that it is a flat $0.001 per on-chain transaction, while Stripe lists stablecoins at 1.5% of the amount. So Stripe stablecoins cost less per call below about $0.067 (1.5% of $0.067 is $0.001) and the CDP facilitator costs less above it. x402 batch-settlement, which settles many payments in one transaction, lowers the x402 cost further.
- Cards through Stripe (Shared Payment Tokens) have a $0.50 minimum plus 2.9% + 30¢, so they do not suit sub-dollar per-call pricing. Stablecoins on either rail do.
- Choose Stripe if you need fiat in a bank account, refunds from a dashboard or card acceptance. Choose x402 if you want funds in your own wallet with no Stripe account. Stripe also accepts x402 on Base, so you can use both.

x402 services with the highest payment-verified trust:
1. Loyal Spark [Pay-per-call API] https://agentropolis.io/listing/x402.loyal-spark | price $0.001–$0.01 per call | rail x402 | trust 100 | verified buyers 30d 100
2. StableEnrich [Pay-per-call API] https://agentropolis.io/listing/mpp.stableenrich | price $0.002–$0.22 per call | rail mpp/x402 | trust 96 | verified buyers 30d 336
3. Clash of Coins Checkout [Pay-per-call API] https://agentropolis.io/listing/x402.clash-of-coins-checkout | price $0.001 per call | rail x402 | trust 95 | verified buyers 30d 185
4. Nansen [Pay-per-call API] https://agentropolis.io/listing/mpp.nansen | price $0.01–$0.05 per call | rail mpp/x402 | trust 94 | verified buyers 30d 157
5. Otto AI [Pay-per-call API] https://agentropolis.io/listing/x402.otto-ai | price $0.001–$1.75 per call | rail x402 | trust 93 | verified buyers 30d 467
6. glim.sh [Pay-per-call API] https://agentropolis.io/listing/x402.glim-sh | price $0.001–$0.01 per call | rail x402 | trust 93 | verified buyers 30d 88
7. StableSocial [Pay-per-call API] https://agentropolis.io/listing/mpp.stablesocial | price $0.06 per call | rail mpp/x402 | trust 92 | verified buyers 30d 87
8. twit.sh [Pay-per-call API] https://agentropolis.io/listing/x402.twit-sh | price $0.0025–$0.01 per call | rail x402 | trust 91 | verified buyers 30d 80
9. agentstools [Pay-per-call API] https://agentropolis.io/listing/x402.agentstools | price $0.002–$0.05 per call | rail x402 | trust 90 | verified buyers 30d 85
10. Agent402.tools [Pay-per-call API] https://agentropolis.io/listing/x402.agent402-tools | price $0.005–$0.02 per call | rail x402 | trust 89 | verified buyers 30d 259

MPP services in the index:
1. StableEnrich [Pay-per-call API] https://agentropolis.io/listing/mpp.stableenrich | price $0.002–$0.22 per call | rail mpp/x402 | trust 96 | verified buyers 30d 336
2. Nansen [Pay-per-call API] https://agentropolis.io/listing/mpp.nansen | price $0.01–$0.05 per call | rail mpp/x402 | trust 94 | verified buyers 30d 157
3. StableSocial [Pay-per-call API] https://agentropolis.io/listing/mpp.stablesocial | price $0.06 per call | rail mpp/x402 | trust 92 | verified buyers 30d 87
4. Exa [Pay-per-call API] https://agentropolis.io/listing/mpp.exa | price $0.007 per call | rail mpp/x402 | trust 87 | verified buyers 30d 166
5. StableTravel [Pay-per-call API] https://agentropolis.io/listing/mpp.stabletravel | price $0.0054–$0.05 per call | rail mpp/x402 | trust 83 | verified buyers 30d 91
6. StableUpload [Pay-per-call API] https://agentropolis.io/listing/mpp.stableupload | price $2.00 per call | rail mpp/x402 | trust 81 | verified buyers 30d 66
7. StableEmail [Pay-per-call API] https://agentropolis.io/listing/mpp.stableemail | price $0.02–$5.00 per call | rail mpp/x402 | trust 75 | verified buyers 30d 29
8. DripStack [Pay-per-call API] https://agentropolis.io/listing/mpp.dripstack | price $3.50 per call | rail mpp/x402 | trust 52 | verified buyers 30d 14
9. 2Captcha [Pay-per-call API] https://agentropolis.io/listing/mpp.twocaptcha | price n/a | rail mpp | trust none | verified buyers 30d n/a
10. agentfax [Pay-per-call API] https://agentropolis.io/listing/mpp.agentfax | price n/a | rail mpp | trust none | verified buyers 30d n/a

Sources:
[1] x402 Foundation / x402 protocol: https://docs.cdp.coinbase.com/x402/support/faq
[2] Coinbase CDP x402 facilitator: pricing and networks: https://docs.cdp.coinbase.com/x402/seller/facilitator
[3] Stripe pricing (cards, stablecoins, disputes): https://stripe.com/pricing
[4] Stripe machine payments (MPP, x402, minimums, availability): https://docs.stripe.com/payments/machine
[5] Stripe MPP docs (Shared Payment Tokens minimum): https://docs.stripe.com/payments/machine/mpp
[6] Coinbase CDP x402 FAQ (no processor or chargeback fees): https://docs.cdp.coinbase.com/x402/support/faq
[7] x402-list.com on-chain measured settlements (CC BY 4.0), used for payment-verified trust and verified buyers: https://x402-list.com
[8] Official MCP Registry (CC0 1.0): https://registry.modelcontextprotocol.io
[9] Agentropolis trust method hub-trust-v0.1: https://agentropolis.io/api/v1/trust/method

### Web search for agents: MCP servers vs pay-per-call APIs
URL: https://agentropolis.io/compare/best-mcp-servers-for-web-search (updated 2026-10-03)

An agent can get web search through an MCP server (usually with your own API key for the underlying search provider) or by paying per query over x402 with no account. MCP servers below come from the Official MCP Registry; those with a published remote endpoint are listed first because they need no local install.
We have no usage data for MCP servers, so their order is by relevance only. Pay-per-call APIs are ranked by payment-verified trust from on-chain settlements.

Why this page exists: “web search” is the most common search on Agentropolis and the example query in our llms.txt.

Web search MCP servers:
1. Web Search API [MCP server] https://agentropolis.io/listing/mcp.io-github-br0ski777-web-search | price n/a | rail n/a | trust none | verified buyers 30d n/a
2. AIsa Web Search & Research [MCP server] https://agentropolis.io/listing/mcp.one-aisa-web-search | price n/a | rail n/a | trust none | verified buyers 30d n/a
3. com.jojapi/google-web-search [MCP server] https://agentropolis.io/listing/mcp.com-jojapi-google-web-search | price n/a | rail n/a | trust none | verified buyers 30d n/a
4. ai.keenable/web-search [MCP server] https://agentropolis.io/listing/mcp.ai-keenable-web-search | price n/a | rail n/a | trust none | verified buyers 30d n/a
5. ai.groundroute/web-search [MCP server] https://agentropolis.io/listing/mcp.ai-groundroute-web-search | price n/a | rail n/a | trust none | verified buyers 30d n/a
6. Web Search & Data API [MCP server] https://agentropolis.io/listing/mcp.xyz-kadec0-web-search-data-api | price n/a | rail n/a | trust none | verified buyers 30d n/a
7. Parallel Search MCP [MCP server] https://agentropolis.io/listing/mcp.ai-parallel-search-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
8. AgentsHub Web Search [MCP server] https://agentropolis.io/listing/mcp.io-github-tvstat1-agent-data-provider | price n/a | rail n/a | trust none | verified buyers 30d n/a
9. SERPdive Web Search [MCP server] https://agentropolis.io/listing/mcp.com-serpdive-serpdive-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
10. search-mcp [MCP server] https://agentropolis.io/listing/mcp.dev-ioconnex-search-mcp | price n/a | rail n/a | trust none | verified buyers 30d n/a
11. Iskat — Russian-language web search for agents [MCP server] https://agentropolis.io/listing/mcp.io-iskat-webdex | price n/a | rail n/a | trust none | verified buyers 30d n/a
12. Brainiall Web [MCP server] https://agentropolis.io/listing/mcp.com-brainiall-web | price n/a | rail n/a | trust none | verified buyers 30d n/a
13. Penny Search [MCP server] https://agentropolis.io/listing/mcp.io-github-ayoubsalem-spec-penny-search | price n/a | rail n/a | trust none | verified buyers 30d n/a
14. Ninelayer [MCP server] https://agentropolis.io/listing/mcp.in-ninelayer-search | price n/a | rail n/a | trust none | verified buyers 30d n/a
15. Exa Search [MCP server] https://agentropolis.io/listing/mcp.io-github-pollinations-exa | price n/a | rail n/a | trust none | verified buyers 30d n/a

Pay-per-call web search APIs (x402):
1. Exa [Pay-per-call API] https://agentropolis.io/listing/mpp.exa | price $0.007 per call | rail mpp/x402 | trust 87 | verified buyers 30d 166
2. BlockRun [Pay-per-call API] https://agentropolis.io/listing/x402.blockrun | price $0.003–$0.01 per call | rail x402 | trust 86 | verified buyers 30d 425
3. ForgeMesh x402 Router [Pay-per-call API] https://agentropolis.io/listing/x402.forgemesh-x402-router | price $0.001 per call | rail x402 | trust 52 | verified buyers 30d 9
4. x402 Crypto Research API [Pay-per-call API] https://agentropolis.io/listing/x402.x402-crypto-research-api | price $0.01 per call | rail x402 | trust 11 | verified buyers 30d 1
5. Straelo Relay [Pay-per-call API] https://agentropolis.io/listing/x402.straelo-relay | price $0.003–$0.03 per call | rail x402 | trust none | verified buyers 30d 3
6. Scout — evidence-first research [Pay-per-call API] https://agentropolis.io/listing/x402.scout-evidence-first-research | price $0.–$2.00 per call | rail x402 | trust none | verified buyers 30d 0
7. Agent Search (CyberWareX) [Pay-per-call API] https://agentropolis.io/listing/x402.agent-search-cyberwarex | price $0.003 per call | rail x402 | trust none | verified buyers 30d 0
8. Neurobird Search [Pay-per-call API] https://agentropolis.io/listing/x402.neurobird-search | price $0.005 per call | rail x402 | trust none | verified buyers 30d 0
9. RONIN Search Router [Pay-per-call API] https://agentropolis.io/listing/x402.ronin-search-router | price $0.01 per call | rail x402 | trust none | verified buyers 30d 0
10. Tavily Search [Pay-per-call API] https://agentropolis.io/listing/x402.tavily-search | price $0.01 per call | rail x402 | trust none | verified buyers 30d 0
11. MicroTap [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.x402tap | price $0.001–$0.05 per call | rail x402 | trust 78 | verified buyers 30d 49
12. fetcher.sh — Twitter, TikTok, Instagram & Web Data APIs [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.fetcher-sh-twitter-tiktok-instagram-web-data-apis | price $0.002–$0.005 per call | rail x402 | trust 74 | verified buyers 30d 30
13. CONNSKILL Growth Services [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.connskill-growth-services | price $0.005–$18.00 per call | rail x402 | trust 70 | verified buyers 30d 22
14. PennyRail [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.pennyrail | price $0.001–$0.02 per call | rail x402 | trust 43 | verified buyers 30d 4
15. Web Search & Data API — SERP, page reader & scrapers [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.hacker-news-stories-search | price $0.005–$0.15 per call | rail x402 | trust none | verified buyers 30d 57

Sources:
[1] x402-list.com on-chain measured settlements (CC BY 4.0), used for payment-verified trust and verified buyers: https://x402-list.com
[2] Official MCP Registry (CC0 1.0): https://registry.modelcontextprotocol.io
[3] Agentropolis trust method hub-trust-v0.1: https://agentropolis.io/api/v1/trust/method

### Token safety / honeypot check APIs for agents
URL: https://agentropolis.io/compare/token-safety-check-apis-for-agents (updated 2026-10-03)

Before an agent swaps into a token it can ask a risk API whether the token can be sold, whether ownership is renounced and whether taxes or blacklists apply. Ranking: payment-verified trust first, then verified buyers, then listed price.
Disclosure: Token Preflight is a first-party kit published by Seenly, which is affiliated with Agentropolis. It is shown in its own labelled block and not ranked.

Why this page exists: Token safety checks are a recurring search on Agentropolis (API and MCP).

First-party (Seenly, affiliated; not ranked):
- Token Preflight — Base pre-trade token check (https://agentropolis.io/listing/seenly.seenly-token-preflight): $0.02 USDC per call on Base via x402

Token risk and honeypot check listings:
1. Hugen DeFi Intelligence API [Pay-per-call API] https://agentropolis.io/listing/x402.hugen-defi-intelligence-api | price $0.01 per call | rail x402 | trust 84 | verified buyers 30d 397
2. OnchainPulse [Pay-per-call API] https://agentropolis.io/listing/x402.onchainpulse | price $0.01–$0.20 per call | rail x402 | trust 80 | verified buyers 30d 76
3. x402-farm [Pay-per-call API] https://agentropolis.io/listing/x402.x402-farm | price $0.003–$0.10 per call | rail x402 | trust 66 | verified buyers 30d 17
4. AeroCheck [Pay-per-call API] https://agentropolis.io/listing/x402.aerocheck | price $0.05 per call | rail x402 | trust 64 | verified buyers 30d 35
5. LoneStarOracle TokenScope [Pay-per-call API] https://agentropolis.io/listing/x402.lonestaroracle-tokenscope | price $0.15 per call | rail x402 | trust 64 | verified buyers 30d 35
6. Token Safety Check (x402) [Pay-per-call API] https://agentropolis.io/listing/x402.token-safety-check-x402 | price $0.03 per call | rail x402 | trust 54 | verified buyers 30d 16
7. zlv402 [Pay-per-call API] https://agentropolis.io/listing/x402.zlv402 | price $0.002 per call | rail x402 | trust 24 | verified buyers 30d 2
8. token-risk [Pay-per-call API] https://agentropolis.io/listing/x402.token-risk | price $0.01–$0.05 per call | rail x402 | trust 22 | verified buyers 30d 2
9. Base Token Risk Check [Pay-per-call API] https://agentropolis.io/listing/x402.base-token-risk-check | price $0.01–$0.08 per call | rail x402 | trust 20 | verified buyers 30d 2
10. Julie Autonomous Security Agent [Pay-per-call API] https://agentropolis.io/listing/x402.julie-autonomous-security-agent | price $0.01 per call | rail x402 | trust 11 | verified buyers 30d 1
11. chiefofstaff token safety [Pay-per-call API] https://agentropolis.io/listing/x402.chiefofstaff-token-safety | price $0.01 per call | rail x402 | trust none | verified buyers 30d 2
12. BluSky Sentinel [Pay-per-call API] https://agentropolis.io/listing/x402.blusky-sentinel | price $0.001–$0.002 per call | rail x402 | trust none | verified buyers 30d 0
13. agentstools [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.agentstools | price $0.002–$0.05 per call | rail x402 | trust 90 | verified buyers 30d 85
14. Agent Exchange [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.agent-exchange | price $0.001–$0.09 per call | rail x402 | trust 65 | verified buyers 30d 24
15. AgentToll [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.agenttoll | price $0.001–$0.008 per call | rail x402 | trust 62 | verified buyers 30d 22
16. HexScan [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.hexscan | price $0.001–$0.10 per call | rail x402 | trust 45 | verified buyers 30d 8
17. true402 [Pay-per-call API, multi-endpoint] https://agentropolis.io/listing/x402.true402 | price $0.0001–$0.04 per call | rail x402 | trust 31 | verified buyers 30d 2

Sources:
[1] x402-list.com on-chain measured settlements (CC BY 4.0), used for payment-verified trust and verified buyers: https://x402-list.com
[2] Official MCP Registry (CC0 1.0): https://registry.modelcontextprotocol.io
[3] Agentropolis trust method hub-trust-v0.1: https://agentropolis.io/api/v1/trust/method

## Categories (all)
- Security & verification (https://agentropolis.io/categories/security-verification): 3448 listings, 180 priced, 101 with verified paid usage, 2498 verified buyers summed, median price $0.01
- Crypto & on-chain data (https://agentropolis.io/categories/crypto-onchain-data): 1798 listings, 111 priced, 70 with verified paid usage, 5574 verified buyers summed, median price $0.01
- Media: speech, video & image (https://agentropolis.io/categories/media-speech-video-image): 2153 listings, 76 priced, 44 with verified paid usage, 1722 verified buyers summed, median price $0.01
- LLM inference (https://agentropolis.io/categories/llm-inference): 2316 listings, 69 priced, 43 with verified paid usage, 936 verified buyers summed, median price $0.01
- People & company enrichment (https://agentropolis.io/categories/people-company-enrichment): 2094 listings, 85 priced, 38 with verified paid usage, 917 verified buyers summed, median price $0.008
- Web search (https://agentropolis.io/categories/web-search): 3904 listings, 59 priced, 36 with verified paid usage, 626 verified buyers summed, median price $0.01
- Scraping & extraction (https://agentropolis.io/categories/scraping-extraction): 1173 listings, 72 priced, 32 with verified paid usage, 968 verified buyers summed, median price $0.01
- Social data (https://agentropolis.io/categories/social-data): 945 listings, 32 priced, 24 with verified paid usage, 856 verified buyers summed, median price $0.01
- Other (https://agentropolis.io/categories/other, thin): 3705 listings, 39 priced, 23 with verified paid usage, 272 verified buyers summed, median price $0.01
- Finance & markets (https://agentropolis.io/categories/finance-markets): 1514 listings, 31 priced, 23 with verified paid usage, 502 verified buyers summed, median price $0.02
- Compute & infra tools (https://agentropolis.io/categories/compute-infra-tools): 1977 listings, 14 priced, 9 with verified paid usage, 138 verified buyers summed, median price $0.0075
- Reports & research (https://agentropolis.io/categories/reports-research-intel): 931 listings, 14 priced, 7 with verified paid usage, 54 verified buyers summed, median price $0.01
- Travel (https://agentropolis.io/categories/travel): 502 listings, 25 priced, 7 with verified paid usage, 68 verified buyers summed, median price $0.01
- Off-ramp, gift cards & payouts (https://agentropolis.io/categories/offramp-giftcards-payouts): 74 listings, 6 priced, 4 with verified paid usage, 134 verified buyers summed, median price $0.02
- Productivity & docs (https://agentropolis.io/categories/productivity-docs, thin): 292 listings, 3 priced, 2 with verified paid usage, 12 verified buyers summed, median price $0.002
- Developer tools (https://agentropolis.io/categories/developer-tools, thin): 11331 listings, 3 priced, 1 with verified paid usage, 32 verified buyers summed, median price $0.01
- Weather & geo (https://agentropolis.io/categories/weather-geo, thin): 734 listings, 3 priced, 1 with verified paid usage, 16 verified buyers summed, median price $0.01
- Commerce & purchases (https://agentropolis.io/categories/commerce-purchases, thin): 62 listings, 6 priced, 1 with verified paid usage, 3 verified buyers summed, median price $0.05
- Careers (https://agentropolis.io/categories/careers, thin): 1 listings, 1 priced, 0 with verified paid usage, 0 verified buyers summed, median price $0.5

## Weekly report
Latest edition 2026-40 (data as of 2026-10-02T16:17:40Z): https://agentropolis.io/reports/2026-40
- volume_usd_30d: 44378.7
- settlements_30d: 370307
- x402_services_tracked: 842
- excluded_wash_listings: 112
- watch_low_value_buyers: 1
- median_listed_price_usd: 0.01
- services_with_paid_usage: 466
- median_buyers_per_service: 9
- verified_buyers_30d_summed: 15328
- top10_share_of_summed_buyers_pct: 37.42

Top services by verified buyers:
1. OneSource (crypto_onchain_data): 2064 buyers, 16798 settlements
2. Otto AI (media_speech_video_image): 467 buyers, 5150 settlements
3. BlockRun (llm_inference): 425 buyers, 103258 settlements
4. Content Intelligence API (scraping_extraction): 397 buyers, 916 settlements
5. Domain Intelligence API (security_verification): 397 buyers, 916 settlements
6. Gotobi Calendar API (crypto_onchain_data): 397 buyers, 916 settlements
7. Hugen DeFi Intelligence API (security_verification): 397 buyers, 916 settlements
8. Hugen Intel API (security_verification): 397 buyers, 916 settlements
9. Hugen Visual API (media_speech_video_image): 397 buyers, 916 settlements
10. Hugen Weather API (crypto_onchain_data): 397 buyers, 916 settlements

Attribution: Paid-usage data: x402-list.com (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/), on-chain measured USDC settlements. Wash filtering, aggregation and categories: Agentropolis (hub-trust-v0.1).