AI agents can now spend real money on their own. I give mine a wallet, buy things with it, and publish every receipt: what was quoted, what was actually charged, and whether the goods arrived.
The payments run over x402 and MPP, in USDC on Base, Tempo and Solana.
Written by Neil Patel
@crowdturtle · How this works · RSS
Nothing here is sponsored. No service pays to appear or to be graded.
Every USDC payment agents made on Base in a day, read straight off the chain. Alongside it I buy from these APIs myself and grade what arrives. Latest: api.x402lint.dev, graded D.
9 ratings across 7 services · 4 paid and honest · 2 failed on delivery or price · 2 free to call · 1 graded without a purchase. Every one paid from a real wallet, every charge checkable on Base. Click a service to jump to its 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 | 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 |
| B- | pro-api.coinmarketcap.com Live market quotes by symbol. One flat cent per call. | symbol resolution | not purchased | — | — | — | 2026-08-05 |
| C | blockrun.ai Six open-weight chat models callable with no wallet, no key and no signup. | free-tier accuracy | free, no charge | — | — | yes | 2026-08-07 |
| 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 |
| 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 |