On-chain data APIs for AI agents, paid per call
Paid APIs for transactions, balances and contract data read from blockchains, that an AI agent can call and pay for on the spot with x402, in USDC. We list 38, from 14 sellers. 33 are live and asking for payment correctly, and 18 delivered when we bought from them with real money. The typical price is $0.01 a call (half ask between $0.005 and $0.01).
The APIs
The first 30, in the same order as our search (GET /v1/discover?category=data.onchain, 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 |
|---|---|---|---|
| Base wallet balance (MCP): ETH and USDC for any addressfree samplenightshift-x402.nightshift-labs.workers.dev | $0.005 | verified | probes pass; not bought yet |
| Base gas price + fee estimate in USD (MCP)free samplenightshift-x402.nightshift-labs.workers.dev | $0.005 | verified | probes pass; not bought yet |
| Base & Solana DEX Whale Orderflow & Accumulation Scanner (whale-momentum)free samplewhale-momentum-72343955726.us-central1.run.app | $0.01 | verified | bought, delivered 2026-10-30 |
| Base wallet snapshot (MCP): ETH + 12 major tokens with USD valuesfree samplenightshift-x402.nightshift-labs.workers.dev | $0.01 | verified | probes pass; not bought yet |
| Base gas price right now, with provenancefree sampleapi.m2msentinel.com | $0.005 | verified | bought, delivered 2026-09-11 |
| Contract powers check before an agent signsfree sampleapi.m2msentinel.com | $0.02 | verified | bought, delivered 2026-09-01 |
| Large ERC-20 transfers moving on Basefree sampleapi.m2msentinel.com | $0.02 | verified | bought, delivered 2026-09-22 |
| How much of a contract could actually be checkedfree sampleapi.m2msentinel.com | $0.02 | verified | bought, delivered 2026-09-01 |
| ENS + Basename resolver (MCP): name to address and reversefree samplenightshift-x402.nightshift-labs.workers.dev | $0.005 | verified | probes pass; not bought yet |
| Ankr x402 RPC: Ethereumx402.rpc.ankr.com | $0.001 | verified | bought, delivered 2026-10-19 |
| Ankr x402 RPC: Basex402.rpc.ankr.com | $0.001 | verified | bought, delivered 2026-10-19 |
| Ankr x402 RPC: BNB Smart Chainx402.rpc.ankr.com | $0.001 | verified | bought, delivered 2026-10-19 |
| Ankr x402 RPC: Polygonx402.rpc.ankr.com | $0.001 | verified | bought, delivered 2026-10-19 |
| Ankr x402 RPC: Arbitrumx402.rpc.ankr.com | $0.001 | verified | bought, delivered 2026-10-19 |
| Ankr x402 RPC: Optimismx402.rpc.ankr.com | $0.001 | verified | bought, delivered 2026-10-19 |
| Ankr x402 RPC: Solanax402.rpc.ankr.com | $0.001 | verified | bought, delivered 2026-10-19 |
| Signal Sprint Base Gas Snapshotsignalsprint-mqysbksh.manus.space | $0.005 | verified | probes pass; not bought yet |
| x402.ochinimus.app/api/jito-tips | $0.005 | verified | bought, delivered 2026-10-19 |
| x402.ochinimus.app/api/priority-fees | $0.005 | verified | bought, delivered 2026-10-19 |
| Ankr x402 RPC: Avalanchex402.rpc.ankr.com | $0.001 | verified | bought, delivered 2026-10-19 |
| Digital Energy x402 RPC: Solanaagents.digital-energy.io | $0.005 | verified | probes pass; not bought yet |
| Whale Intelligence — Lookupwhale.hugen.tokyo | $0.01 | verified | bought, delivered 2026-09-15 |
| Gasapi.premiumrewards.vip | $0.01 | verified | probes pass; not bought yet |
| ENS resolveapi.premiumrewards.vip | $0.01 | verified | probes pass; not bought yet |
| Ticketapi.premiumrewards.vip | $0.01 | verified | probes pass; not bought yet |
| Whale Intelligence — Activitywhale.hugen.tokyo | $0.02 | verified | probes pass; not bought yet |
| Whale Intelligence — Movementswhale.hugen.tokyo | $0.02 | verified | bought, delivered 2026-08-16 |
| Decoded ERC-20/721 transfers for a tx (8 chains)ai-policy-kit.moneymaker-ai.workers.dev | $0.005 | verified | probes pass; not bought yet |
| GrokBot Base wallet snapshotgrokbot-dashboard.a3migos.workers.dev | $0.01 | verified | probes pass; not bought yet |
| x402.ochinimus.app/api/base-gas | $0.005 | verified | bought, delivered 2026-10-19 |
All of them, as data: api.nohumans.directory/v1/discover?category=data.onchain&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": "data.onchain", "query": "what you need"}, or REST:
GET https://api.nohumans.directory/v1/discover?category=data.onchain&q=<what you need>
Before paying any endpoint, check its record: how, and when not to pay.
Sell one
14 sellers already list On-chain data 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
- Crypto data APIs
- Web data APIs
- LLM APIs
- Geolocation and maps APIs
- Market data APIs
- Image and media generation APIs
- Weather APIs
- Currency exchange rate APIs
- Developer tool APIs
- News APIs
- Stock market data APIs
- Search APIs
- Intelligence and analysis APIs
- DeFi data APIs
- Derivatives and funding rate APIs
- Validation APIs
- Macroeconomic data APIs
- Social media data APIs
- Verification 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.