Agent wallets get drained when a lookalike seller swaps payTo or coin, or when wash-listed endpoints look popular. A cheap pre-payment check and a seller-wallet reputation lookup reduce that risk. Rows below are ranked by payment evidence, then relevance.
Disclosure: Pay Guard is an Agentropolis kit published by Seenly, which is affiliated with Agentropolis. It is shown in its own labelled block and not ranked.
| # | Listing | Listed price | Rail | Trust | Verified buyers 30d | Uptime 30d |
|---|---|---|---|---|---|---|
| - | Pay Guard — pre-payment allow/warn/block + Seller Wallet Reputation Kit · first-party (Seenly, affiliated) Before your agent signs an x402 402: check payTo↔verified domain, price/asset/network, lookalike/URL safety, and wash flags. Returns allow|warn|block. Bundled Seller Wallet Reputat Source: Seenly (first-party). | $0.01–$0.02 USDC per call on Base via x402 | x402 | none | 0 | n/a |
| # | Listing | Listed price | Rail | Trust | Verified buyers 30d | Uptime 30d |
|---|---|---|---|---|---|---|
| 1 | x402 Trust Prober Pay-per-call API Deterministic trust scoring and monitoring for the x402 ecosystem. 88k+ endpoints tracked 24/7 on Base + Solana: probe reliability, latency, spec compliance, price history, and rea Source: x402-list.com. | $0.005–$0.50 per call | x402 | 51 | 8 | 98.7% |
| 2 | Cookin Memecoin Intelligence Pay-per-call API Solana and Pump.fun memecoin intelligence: token quality scores, bundle and coordinated wallet detection, holder behavior, KOL positions, trader reputation, and deployer launch his Source: x402-list.com. | $0.01–$0.02 per call | x402 | 44 | 5 | 99.9% |
| 3 | Orbylon Pay-per-call API Orbylon checks whether a business can be found, trusted and paid by AI agents. The paid endpoint runs sixteen checks against any domain and returns the complete machine readable re Source: x402-list.com. | $0.05 per call | x402 | 32 | 3 | 100% |
| 4 | badhttp Pay-per-call API A test server for x402 client implementations: the payment IS the scenario under test, not a toll on data. /402/pay/base is a real, settling x402 paywall (0.01 USDC on Base by defa Source: x402-list.com. | $0.01 per call | x402 | 30 | 3 | 100% |
| 5 | Polymarket Signal Detector Pay-per-call API Polymarket wallet-reputation and insider-signal data, gated by x402: per-wallet reputation lookup, per-market wallet-flow by persona, a free-to-verify signal track record, resolved Source: x402-list.com. | $0.01–$33.00 per call | x402 | none | 0 | 99.9% |
| 6 | Boundary Guard x402 MCP server · remote endpoint MCP tools for x402 readiness, paid-path probes, launch packs, and trust receipts. Source: MCP Registry. | n/a | n/a | none | n/a | n/a |
| 7 | AgentKYB MCP server · remote endpoint Free local payment guard for AI agents plus paid deep vendor KYB via x402. Source: MCP Registry. | n/a | n/a | none | n/a | n/a |
| 8 | FabTally Guard MCP server · remote endpoint Verify before you act: deps-check, x402-preflight, json-repair & url-read for agents. Source: MCP Registry. | n/a | n/a | none | n/a | n/a |
| 9 | Wisely x402 Agent-Payment Infrastructure MCP server · remote endpoint Self-facilitated x402/MCP payments for hosted endpoints, rail proofs, receipts, and agents. Source: MCP Registry. | n/a | n/a | none | n/a | n/a |
| 10 | x402 Pay — USDC API Payment Helper MCP server · remote endpoint Pay for APIs with USDC. Read-only x402 payment discovery, verification, evidence, and status. Source: MCP Registry. | n/a | n/a | none | n/a | n/a |
| 11 | Check x402 Payment Readiness MCP server · remote endpoint Call before paying an x402 resource. Returns PAY/BLOCKED. Does not move funds. Source: MCP Registry. | n/a | n/a | none | n/a | n/a |
| 12 | io.github.AgentTanuki/x402-payment-safety MCP server · remote endpoint Authorize x402 payments before signing with request-bound, signed safety decisions. Source: MCP Registry. | n/a | n/a | none | n/a | n/a |
| 13 | Nansen Pay-per-call API · multi-endpoint (topic is one of many) Blockchain analytics and smart money intelligence. Token data, wallet profiling, DEX trades, PnL, and flow analysis across multiple chains. Source: MPP registry. | $0.01–$0.25 per call | mpp, x402 | 95 | 181 | 100% |
| 14 | NetIntel Pay-per-call API · multi-endpoint (topic is one of many) Pay-per-call network & domain intelligence API — DNS, SSL/TLS, WHOIS/RDAP, email security (SPF/DKIM/DMARC), IP geolocation/reputation/risk, OSINT, plus LLM-backed text tools (class Source: x402-list.com. | $0.001–$0.65 per call | x402 | 84 | 72 | 100% |
| 15 | x402watch Pay-per-call API · multi-endpoint (topic is one of many) · shares a payout wallet with other services Analytics API for the x402 ecosystem. Returns an 8-label classification with confidence for a buyer wallet, plus on-demand wash trading checks for any wallet or seller address. Source: x402-list.com. | $0.005–$0.05 per call | x402 | 78 | 92 | 99.7% |
| 16 | nsgoods Agent Trust & Screening Oracle Pay-per-call API · multi-endpoint (topic is one of many) nsgoods, the verifiable trust layer for AI agents. Two products on one host: signed OFAC sanctions + malicious-address screening for any EVM or Solana address (deny/review/clean ve Source: x402-list.com. | $0.005 per call | x402 | 59 | 22 | 100% |
| 17 | token-risk Pay-per-call API · multi-endpoint (topic is one of many) Deterministic on-chain structural risk report for an ERC-20 token on Base. Keyless x402-native payment — no signup, no API key. Reports STRUCTURAL risk, not reputation: centralized Source: x402-list.com. | $0.01 per call | x402 | 54 | 10 | 99.9% |
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