{"resource":"https://modelmarket.dev/x402/x402-check","service":"AIMarket","areas":["other"],"answering":true,"http_status":402,"latency_ms":236,"price_usdc":0.003,"buyers_30d":1,"calls_30d":2,"description":"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 no","id":"834efd7b81fa","category":"Payments and on-ramps","accuracy":null,"tool_calls":null,"checked_day":"2026-10-11","page":"https://velliumandco.com/sellers/834efd7b81fa"}