{"slug":"agents-avasis-ai-v1-base-payment-verify-a365d7","title":"x402 payment verify on Base (chain 8453, $0.02)","host":"agents.avasis.ai","method":"GET","resource":"https://agents.avasis.ai/v1/base/payment-verify","category":"other","description":"x402 payment verify on Base (chain 8453, $0.02): tx hash (your PAYMENT-RESPONSE transaction) or from + nonce of the EIP-3009 authorization you signed -> settled yes/no from the chain (AuthorizationUsed + adjacent USDC Transfer): payer, payTo, amount, block, confirmations, safe/finalized, relayer lab","price_listed":0.02,"price_asked":null,"state":"effects","state_label":"Not tested: has real-world effects","checks_7d":0,"answered_7d":0,"latency_ms_median":null,"reported_calls_30d":1,"reported_payers_30d":1,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"method":"GET","queryParams":{"amount":"2000","network":"base","payTo":"0x6264191d6dd5427435b5e829077842e130ef1fc8","tx":"0x058bc61d196b9d6ea4cc15315711ef075a0c7e9a3224c19e3deb44eaa4f568ec","wait":0},"type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"method":{"enum":["GET"],"type":"string"},"queryParams":{"additionalProperties":false,"properties":{"amount":{"description":"optional expected amount in atomic units (USDC: 20000 = $0.02, the accepts[].amount you paid) or a decimal with a dot (0.02): sets matches.amount","type":"string"},"asset":{"description":"optional token contract (0x + 40 hex; default USDC on Base)","type":"string"},"from":{"description":"with nonce: the payer address of the EIP-3009 authorization you signed (payload.authorization.from)","type":"string"},"lookback":{"description":"for from + nonce: blocks to search back (default 50000, about 28 h on Base; max 150000)","maximum":150000,"minimum":1000,"type":"integer"},"network":{"description":"optional; must be base / eip155:8453 (x402 USDC settles on Base)","type":"string"},"nonce":{"description":"with from: the 32-byte authorization nonce (payload.authorization.nonce, 0x + 64 hex)","type":"string"},"payTo":{"description":"optional expected recipient (the 402's accepts[].payTo): sets matches.payTo","type":"string"},"tx":{"description":"the settle transaction hash (0x + 64 hex): the `transaction` of your x402 PAYMENT-RESPONSE / settle receipt. Or pass from + nonce instead","type":"string"},"wait":{"description":"seconds to keep looking for the settle before answering (default 5, max 25; 0 = one read). Unknown after that -> 404, not charged","maximum":25,"minimum":0,"type":"integer"}},"type":"object"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"},"output":{"properties":{"example":{"properties":{"advice":{"type":"string"},"also_available":{"type":"object"},"asset":{"type":"object"},"authorizations":{"type":"integer"},"block":{"type":["object","null"]},"chain":{"type":"string"},"chain_id":{"type":"integer"},"confirmations":{"type":["integer","null"]},"expected":{"type":"object"},"finality":{"type":"object"},"found":{"type":"boolean"},"headline":{"type":"string"},"kind":{"type":"string"},"latest_block":{"type":["integer","null"]},"lookup":{"type":"string"},"matches":{"type":"object"},"method":{"type":"object"},"mined":{"type":"boolean"},"network":{"type":"string"},"payment":{"type":["object","null"]},"polls":{"type":"integer"},"rail":{"type":"string"},"searched":{"type":"object"},"settled":{"type":"boolean"},"submitter":{"type":"object"},"transfers":{"type":"array"},"transfers_total":{"type":"integer"},"tx":{"type":"object"},"tx_hash":{"type":["string","null"]},"verdict":{"type":"string"},"waited_ms":{"type":"integer"}},"required":["chain","network","found","settled","verdict","headline","matches","waited_ms","polls"],"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[],"description_full":"x402 payment verify on Base (chain 8453, $0.02): tx hash (your PAYMENT-RESPONSE transaction) or from + nonce of the EIP-3009 authorization you signed -> settled yes/no from the chain (AuthorizationUsed + adjacent USDC Transfer): payer, payTo, amount, block, confirmations, safe/finalized, relayer label, fee, matches vs your expected payTo/amount. Phrases: x402 payment verify, did my payment settle, verify usdc payment, settlement proof. GET or POST. Not found -> 404, never charged.","last_updated":"2026-11-02T17:30:43.621Z","schemes":["exact"]}