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X402 · X402 Check

Debug an x402 payment before you submit it — why does USDC answer invalid signature? Verifies the EIP-3009 transferWithAuthorization (EIP-712 signer, v, low s, validity window) and the seller's terms (payTo, amount, asset, network, bound nonce), and names the domain a failing signature was really made for, e.g. Base Sepolia's 'USDC' used for Base mainnet's 'USD Coin', the commonest reason an x402 payment reverts. Offline, deterministic, signed answer.

POST https://modelmarket.dev/x402/x402-check

0.003 USDC on Base · payTo 0x1218ff36C5d2e3B6A565CdB1A8B1AcCFc606Ad0a

Status: unverified (probe-pending)

Settlement: direct to the seller's payTo — 0% HIVE402 take

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