Verification APIs for AI agents, paid per call
Paid APIs for checks of claims, documents, identities or records, that an AI agent can call and pay for on the spot with x402, in USDC. We list 37, from 24 sellers. 28 are live and asking for payment correctly, and 11 delivered when we bought from them with real money. The typical price is $0.01 a call (half ask between $0.002 and $0.02).
The APIs
The first 30, in the same order as our search (GET /v1/discover?category=tools.verification, testnets left out): verified first, then probe score, then price.
Nobody can pay for a place here. Each name opens the full record: every check, every purchase, with dates.
| API | price | status | when we bought |
|---|---|---|---|
| AgentResolver Provider Launch Check — Reference Contractfree sampleagentresolver.vercel.app | $0.05 | verified | bought, delivered 2026-09-22 |
| crosscheckapi.com/v1/checkfree sample | $0.02 | verified | probes pass; not bought yet |
| SPORE x402 DNS Preflight (stable host)free samplespore-x402-d.spore-x402.workers.dev | $0.01 | verified | probes pass; not bought yet |
| SPORE x402 Token Approval Check (stable host)free samplespore-x402-c.spore-x402.workers.dev | $0.01 | verified | probes pass; not bought yet |
| SPORE x402 Base Wallet Lens (stable host)free samplespore-x402-e.spore-x402.workers.dev | $0.01 | verified | probes pass; not bought yet |
| SPORE x402 Preflight Verify API (stable host)free samplespore-x402-f.spore-x402.workers.dev | $0.01 | verified | probes pass; not bought yet |
| SPORE x402 Preflight Verify API (stable host)free samplespore-x402-f.anonymux.workers.dev | $0.01 | verified | probes pass; not bought yet |
| SPORE x402 Token Approval Check (stable host)free samplespore-x402-c.anonymux.workers.dev | $0.01 | verified | probes pass; not bought yet |
| SPORE x402 DNS Preflight (stable host)free samplespore-x402-d.anonymux.workers.dev | $0.01 | verified | probes pass; not bought yet |
| SPORE x402 Base Wallet Lens (stable host)free samplespore-x402-e.anonymux.workers.dev | $0.01 | verified | probes pass; not bought yet |
| SPORE x402 Attestation API (stable host)free samplespore-x402.anonymux.workers.dev | $0.005 | verified | probes pass; not bought yet |
| Check an x402 endpoint before paying it - SPORE signed endpoint checkfree samplespore-x402-f.spore-x402.workers.dev | $0.002 | verified | probes pass; not bought yet |
| SPORE x402 Attestation API (stable host)free samplespore-x402.spore-x402.workers.dev | $0.005 | verified | probes pass; not bought yet |
| AgentResolver Settlement Pingagentresolver.vercel.app | $0.001 | verified | bought, delivered 2026-09-17 |
| AgentResolver Guard — Payment Authorizationagentresolver.vercel.app | $0.001 | verified | bought, delivered 2026-09-24 |
| AgentResolver CDP Settlement Ping — Fresh Paid Verifyagentresolver.vercel.app | $0.001 | verified | bought, delivered 2026-09-18 |
| AgentResolver Verified Resolveagentresolver.vercel.app | $0.02 | verified | bought, delivered 2026-09-22 |
| AgentResolver Provider Launch Checkagentresolver.vercel.app | $0.05 | verified | bought, delivered 2026-09-22 |
| ClaimGate — ScriptMasterLabsclaimgate.onrender.com | $0.25 | verified | probes pass; not bought yet |
| AgentResolver x402 Payment Preflightagentresolver.vercel.app | $0.001 | verified | bought, delivered 2026-09-22 |
| AgentResolver x402 Settlement Verify — Base USDC Receiptagentresolver.vercel.app | $0.001 | verified | bought, delivered 2026-09-22 |
| crosscheck acceptcrosscheckapi.com | $0.03 | verified | probes pass; not bought yet |
| Taskmill Email Verification3c18b2d704b6940881478ee13baabb5a-dev.ctonew.app | $0.02 | verified | probes pass; not bought yet |
| AgentResolver CDP Payment Guardagentresolver.vercel.app | $0.002 | verified | bought, delivered 2026-09-22 |
| Creator Desk Commerce Readinesscreator-desk-x402-isolated.onrender.com | $0.05 | verified | probes pass; not bought yet |
| receipt-check: x402 payment receipt verifieragent-audit.agent-audit.workers.dev | $0.003 | verified | bought, delivered 2026-10-30 |
| SVG Ready — SVG Preflight Demosvgready.bakongi.chatgpt.site | $0.01 | verified | probes pass; not bought yet |
| TELAGO x402 Payment Preflight — Verify Before Payfree sampletelago-x402-discovery.vercel.app | $0.001 | verified | bought, delivered 2026-10-15 |
| SML Agent Verifyscriptmasterlabs.com | $0.05 | unverified | not verified yet |
| SML token-verdictsml-agent-products.onrender.com | $0 | failing | failing its checks |
All of them, as data: api.nohumans.directory/v1/discover?category=tools.verification&limit=50. Live figures, as of 2026-11-07 02:39 UTC.
For agents
Search this kind of API from your agent, free, no key. MCP server https://api.nohumans.directory/mcp, tool
find_paid_service with {"category": "tools.verification", "query": "what you need"}, or REST:
GET https://api.nohumans.directory/v1/discover?category=tools.verification&q=<what you need>
Before paying any endpoint, check its record: how, and when not to pay.
Sell one
24 sellers already list Verification APIs here, at a typical $0.01 a call. Agents choose on evidence: a free sample, inputs they can read, and a purchase that delivered. Check yours free and list it · what x402 APIs charge and earn · build one with one prompt.
Other kinds of API
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- Developer tool APIs
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- Derivatives and funding rate APIs
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- On-chain data APIs
- GitHub data APIs
- AI inference APIs
- Web scraping APIs
- Research data APIs
Figures count active listings on mainnet, tunnels and testnets excluded; prices are the live payment requests of verified listings on Base. Records are dated evidence about how an endpoint behaved, not a guarantee. How we check.