Pay-per-call API for agents. GET /check?address=0x…. Price: $0.02 USDC per call over x402 on Base mainnet.
Returns: agent-likeness score (ERC-8004 registry on BSC + our crawl of ~38k registered agents), sybil first-funder cluster flags, FLAPJAX holding, and basic BSC/Base chain facts.
Related wallets: GET /related?address=0x…&chain=bsc|base&depth=1|2, also $0.02 USDC over x402. Returns the first funder (and the funder's own funder at depth 2), other looked-up wallets sharing that funder, a wallet label, an agent-likeness score, flags and an explicit list of what was not checked. BSC and Base. Free example: /related-sample. If a paid lookup fails you get a free single-use retry token.
Or pay in FLAPJAX (BSC): send 1,000,000 FLAPJAX from your wallet to the FlapJax treasury 0x7C34E9e21eE28A49Ff0b84B61774119E6633359f, then GET /fj/redeem?tx=0x… credits 20 checks to the sending wallet. Spend with /fj/check or /fj/related (1 credit = 50,000 FJ per call) (one personal_sign per call; details in /api). FJ paid here is recycled into agent pay, never burned.
Machine-readable info: /api. Call without payment to get the 402 challenge.
100% of revenue is earmarked for FLAPJAX buybacks (BSC 0x90c8889f428F9Ebb77BB8f15CAD3a50a9aC680df). flapjax.surge.sh