Topics / Agent-to-agent micropayment APIs

Agent-to-agent micropayment APIs

Updated 2026-10-03 · data from the live Agentropolis index · 15 listings shown, 7 with a listed price or payment evidence

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.

Disclosure. Agentropolis is a search engine, not a payment party, and is affiliated with Seenly. Kits marked "first-party (Seenly, affiliated)" are ours; they are shown in a separate block and never ranked. Placement on this page is not for sale (paid featured slots are excluded) and there are no affiliate fees; outbound links are nofollow.

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. Last 90 days: 1 matching searches on Agentropolis, 1 of them from outside agents or people (bots, crawlers and our own tests excluded).

Payment and settlement APIs for agents

#	Listing	Listed price	Rail	Trust	Verified buyers 30d	Uptime 30d
1	vaaya Pay-per-call API The agent payment system: one MCP server that lets any agent call paid APIs — image/video gen, product demos, web search & scraping, deep/market research, lead enrichment, GTM, san Source: x402-list.com.	$0.01–$2.00 per call	x402	89	89	100%
2	AsterPay Pay-per-call API Trust, discovery and EUR settlement layer for AI agent payments. KYA agent trust scoring (0-100) with sanctions screening and ERC-8004 identity, x402 micropayments, crypto/market a Source: x402-list.com.	$0.001–$0.01 per call	x402	49	9	100%
3	x402dir Facilitator Recommend Pay-per-call API Recommend the best x402 payment facilitator by chain, token, and monthly volume. Returns ranked facilitators with fee estimates as JSON. Paid via x402 at $0.001 USDC per query on B Source: x402-list.com.	$0.001 per call	x402	36	4	100%
4	Horizon Pulse Pay-per-call API Pay-per-call APIs for AI agents over x402 v2 on Base USDC (Coinbase CDP facilitator): crypto market pulse, technical signals, DeFi yields, wallet portfolio, gas and funding rates, Source: x402-list.com.	$0.005–$0.04 per call	x402	33	4	100%
5	agent-dust Pay-per-call API Tiny x402-paid oracles for agents: Base/Solana wallet preflight, Solana rent recovery scan, x402 echo, x402 facilitator health matrix, and an x402 payment-required linter. Source: x402-list.com.	$0.005–$0.02 per call	x402	none	0	81.3%
6	Permit Verdict Settlement Oracle Pay-per-call API Settlement oracle for crypto price events. Answers whether an asset traded or closed above/below a threshold during a window, with YES/NO/DISPUTED, per-venue evidence from Hyperliq Source: x402-list.com.	$0.01–$0.25 per call	x402	none	0	0%
7	LedgerProof Settlement Army Pay-per-call API Pay-per-call evidence for autonomous agents, settled in USDC on Base via x402 — no account, no API key, no subscription. POST a subject with your current and required confidence, a Source: x402-list.com.	$0.05 per call	x402	none	0	77.2%
8	PayAI x402 Facilitator MCP server · remote endpoint Verify and settle x402 stablecoin payments; browse the PayAI Bazaar of x402-payable resources. Source: MCP Registry.	n/a	n/a	none	n/a	n/a
9	Vermarco MCP server · remote endpoint Marketplace and payment rail for AI agents: list, buy and settle with signed receipts. Source: MCP Registry.	n/a	n/a	none	n/a	n/a
10	BentCrypto Machine Payments MCP server · remote endpoint Paid token risk and security intelligence for AI agents over MCP with x402 payments. Source: MCP Registry.	n/a	n/a	none	n/a	n/a
11	Stabledrop escrow payments MCP server · remote endpoint Stablecoin escrow payments the buyer can dispute, with a signed receipt. Pay a wallet or an email. Source: MCP Registry.	n/a	n/a	none	n/a	n/a
12	AgentPay x402 Facilitator MCP server · remote endpoint Verify signed x402 payments; treasury-scoped settlement is irreversible. Source: MCP Registry.	n/a	n/a	none	n/a	n/a
13	Neuronto Payments: x402 facilitator MCP server · remote endpoint Neuronto Pay: x402 facilitator on Base. Settlement prices, live networks, integration code Source: MCP Registry.	n/a	n/a	none	n/a	n/a
14	MCPVOT — x402 Facilitator Machine MCP server · remote endpoint x402 paid APIs for AI agents on Base. Blockchain, wallet, DEX, crypto, web search. Source: MCP Registry.	n/a	n/a	none	n/a	n/a
15	merona — x402 settlement index MCP server · remote endpoint See what actually settles on x402: wash-adjusted volume, payTo checks. Free, no key, no signup. Source: MCP Registry.	n/a	n/a	none	n/a	n/a

Search: micropayment agent payments settle · x402 facilitator settlement · agent wallet payments micropayments · pay per call payments agents

How this list is built

Only listings that exist in the Agentropolis index and whose own name, description or tags match this topic. Multi-endpoint storefronts are labelled and listed after dedicated services.
Order: payment-verified trust (0-100, from wash-filtered on-chain settlements), then verified buyers, then a published remote endpoint, then a listed price, then the lowest price. "none" / "n/a" means no evidence yet, not a bad service. There are no user ratings or reviews.
Trust and buyers are per service, not per endpoint. Listed prices come from the seller's discovery data; the live HTTP 402 challenge is authoritative.
Indexing: a page is noindexed when it has fewer than 5 relevant listings or fewer than 3 with a price or payment evidence.

Sources

Machine-readable: JSON for this page · llms.txt · Corrections: hello@agentropolis.io