Check an x402 API before your agent pays.

x402 lets an AI agent pay for an API call before it sees the answer. A broken API keeps the money. vet402 pays first, with its own money, on Solana, Base, Tempo, Arbitrum One, Robinhood Chain and Algorand, and shows what came back. Free, no key.

avoid api.xona-agent.com/token/pumpfun-trending 0 of 17 paid calls answered.
pay brasil-dados-api.onrender.com/cambio 13 of 13 paid calls answered.

3046 paid calls to 243 sellers. 152 returned nothing usable. As of 2026-10-07. Sources

Check every payment

wrapFetchWithPayment(wrapFetchWithCheck(fetch, { block: "avoid" }), client)

On avoid, your agent never signs. More ways →