Independent reviews of the x402 APIs behind agentic commerce. I give an AI agent a real wallet, buy things with it, and publish every receipt.
Written by Neil·nothing here is sponsored·new? start here·how we grade
I pay for these APIs with my own wallet and publish what happened. The volume this market gets quoted by is mostly wallets paying themselves, so I read the payments off the chain myself. I check whether the answer that comes back is actually right, against a source that cannot be the seller. And the verdict an agent gates on is backed by money that moved. Every weight and threshold behind that is published at how we grade. The sweep covers every USDC payment agents make on Base and Solana, every day. Free MCP server for your agent →
This headline counts USDC received at the seller wallets we track, on Base and Solana, over the last complete UTC day. Of it, $36,727 settled on Base and $96,320 on Solana (Solana is mostly Bitrefill and Laso). The /x402 dashboard sweeps Base only, so it shows roughly the Base portion; a rolling-24h window there also differs from a calendar day by a few percent. Every figure on this site carries its scope for exactly this reason.
25 ratings across 23 services · 15 paid and honest · 8 failed on delivery or price · 1 free to call · 1 graded without a purchase. Where money changed hands the charge is checkable on Base; nothing is graded that was not called. Click a service for the receipt.
| Grade | Service | Graded on | Verdict | Quoted | Charged | Goods | Date |
|---|---|---|---|---|---|---|---|
| A+ | pro-api.coinmarketcap.com Live market quotes for any listed cryptocurrency. One flat cent per call, no matter how many coins you ask for. | price honesty | Honest | $0.01 | $0.01 | yes | 2026-08-05 |
| A+ | api.nansen.ai Wallet and entity analytics across 26 chains, priced from $0.01 to $7.50 per request over x402. | data accuracy | Honest | $0.01 | $0.01 | yes | 2026-08-11 |
| A+ | anywaypossible.com Live Base wallet balance for agents: native ETH and USDC, atomic values, block height and observation time. | provenance | Honest | $0.001 | $0.001 | yes | 2026-08-11 |
| A+ | groundcheck.seiche.info Signed delivery receipts: submit what a paid service returned plus its settlement receipt, get an offline-verifiable verdict on whether payment and goods agree. | delivery verification | Honest | $0.05 | $0.00 | yes | 2026-08-11 |
| A+ | api.anchor-x402.com Reconstructs what a wallet has spent on x402 services from Base chain data, grouped by service. | spend accounting | Honest | $0.01 | $0.01 | yes | 2026-08-12 |
| A | stablememes.dev Auto-captioned meme. You send one line of text, it picks a template from the top 2,048 and captions it. | price honesty | Honest | $0.01 | $0.01 | yes | 2026-08-05 |
| A | api.bitrefill.com Gift cards, eSIMs and mobile top-ups in 180+ countries, bought with USDC, no account. | price honesty | Honest | $0.003 | $0.003 | yes | 2026-08-07 |
| A | blockrun.ai An AI routing and payment layer: 91 models plus 40 blockchain RPCs, billed per request in USDC, no key and no account. | price honesty | Honest | $0.002 | $0.002 | yes | 2026-08-07 |
| A | x402.halowerk.com Checks on chain whether an x402 settlement really happened, against the recipient, amount and asset you expected. | verification accuracy | Honest | $0.002 | $0.002 | yes | 2026-08-11 |
| A | gas.apitoll.cloud Base gas oracle: base fee plus slow, standard and fast tiers, sampled over recent blocks. | value for money | Honest | $0.001 | $0.001 | yes | 2026-08-11 |
| A | 2s.io Email validation: syntax, disposable and role heuristics, and live MX presence via DNS over HTTPS. | data accuracy | Honest | $0.0025 | $0.0025 | yes | 2026-08-11 |
| A | quartermaster.surewhynot.app Verify an x402 settlement on Base or Solana from a transaction hash or a base58 signature. | verification accuracy | Honest | $0.003 | $0.003 | yes | 2026-08-11 |
| A | enrichx402.com Retrieves the full text of a URL, reselling Exa's contents API by the call. | price honesty | Honest | $0.002 | $0.002 | yes | 2026-08-12 |
| A- | signals.edge.report ERC-20 balance for a wallet on Base or Ethereum, one tenth of a cent per read. | provenance | Honest | $0.001 | $0.001 | yes | 2026-08-11 |
| A- | api.anchor-x402.com Random integers in a range, returned with a signature over the result. Sold as a drop-in VRF. | verifiable randomness | Honest | $0.002 | $0.002 | yes | 2026-08-12 |
| B- | pro-api.coinmarketcap.com Live market quotes by symbol. One flat cent per call. | symbol resolution | not purchased | — | — | — | 2026-08-05 |
| C | mcp.fortclaw.com A strategy game for AI agents. Manage units on a map, claim rewards in USDC. | getting in at all | Partial | $0.03 | $0.00 | no | 2026-08-07 |
| C | x402datasource.com Population and weighted median household income within three miles of any US address. | data accuracy | Partial | $0.01 | $0.01 | yes | 2026-08-08 |
| C | api.thetrustlayer.xyz Reputation intelligence for AI agents: trust scores, Sybil detection and cross-chain identity for ERC-8004 agents. | value for money | Partial | $0.001 | $0.001 | yes | 2026-08-08 |
| C | keyronne.com Transaction and receipt lookup across six EVM chains: status, from, to, value, block, gas and logs. | billing correctness | No goods | $0.003 | $0.003 | no | 2026-08-11 |
| C | aeml-x402.zeabur.app A pre-payment trust record for an x402 service: score, liveness state, streak and lifecycle. | freshness | Partial | $0.01 | $0.01 | yes | 2026-08-11 |
| D | mcp.x402.boats A naval trading game for AI agents. Buy ships, sail between ports, trade cargo, earn USDC. | getting in at all | Partial | $0.10 | $0.00 | no | 2026-08-06 |
| D | api.x402lint.dev A conformance scanner that grades x402 sellers A to F on 25 checks, then tells them what to fix. | grading accuracy | free, no charge | — | — | yes | 2026-08-08 |
| D | answerpool.io SEC EDGAR fundamentals over x402: XBRL metrics, company financials, filings and screens, priced $0.02 to $0.05 a call with no key or subscription. | revenue accuracy | Partial | $0.02 to $0.05 | $0.02 to $0.05 | yes | 2026-09-03 |
| F | api.jarvisclaw.ai Top cryptocurrencies by market cap with live price, volume and change, sourced from CoinGecko. | delivery | No goods | $0.001656 | $0.003312 | no | 2026-08-08 |