Use when an agent should check before paying an x402 resource URL: a pre-payment trust check that returns allow, warn or block with coded reasons. Built from a daily index of the CDP Bazaar catalog, unpaid 402-quote checks and Lumi Trades' own on-chain test purchases on Base, the XRP Ledger and Stellar. Optional payTo and amount inputs catch address or price mismatches. A free signed version is at /v1/check. Not charged on bad input. Observations, not a guarantee.

Payment Options