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Plainchain x402 Receipt Verifier
x402
Plainchain x402 Receipt Verifier is a paid API for AI agents from plainchain.appin60.com, paid per call via x402, $0.002942/call, status unknown (last checked 2026-10-14).
Verifies an x402 USDC payment receipt on-chain by checking a settlement transaction hash, confirming the payer, recipient, and amount match expectations.
Price / call$0.002942
Success—
StatusUnknown
How this service works
Gas, balances, token data, address type, approvals, transaction decoding, x402 receipt verification and verifiable randomness on Base, Arbitrum, Ethereum and Optimism. No API key: pay $0.001-$0.01 per call in USDC on Base via x402.
Output
Returns a JSON object with a `verified` boolean, the `scheme` (EIP-3009 transferWithAuthorization), full `payment` details (payer, payTo, amount, symbol), number of `confirmations`, and `checks` flags indicating whether the payTo address and amount match the expected values.
Example use cases
Gating content behind x402 payment
“Before I release the premium report to this user, verify their x402 settlement transaction 0xd4f8...3a21 on Base paid at least 0.005 USDC to my address 0x36c3...”
Auditing a past x402 receipt
“I need to check whether the USDC payment with hash 0x7b2e...c90f on Arbitrum actually went through and how many confirmations it has — can you pull the receipt details?”
Automating pay-per-call service delivery
“My agent just received an x402 payment claim — verify transaction hash 0x1fa2...88bc on Base settled the right amount to the right payTo address before we proceed.”
Technical details
Endpoint
GEThttps://plainchain.appin60.com/v1/x402/receipt?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need cryptographic on-chain confirmation that an x402 USDC micropayment settled correctly before delivering a service or resource. It is purpose-built for the x402 pay-per-call protocol and supports EIP-3009 transferWithAuthorization semantics across Base, Arbitrum, Ethereum, and Optimism — making it the right choice over generic block explorers when you need structured, agent-friendly verification with optional recipient and amount assertions.
Side effects
- Transaction hash not found or not yet indexed — returns unverified or error
- Hash does not match a USDC x402 settlement transaction
- payTo address mismatch — checks.payToMatches returns false
- Amount below minimum threshold — checks.amountMatches returns false
- Unsupported chain specified — returns error
- Malformed transaction hash (not 0x + 64 hex chars) — schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"checks": {
"payToMatches": true,
"amountMatches": true
},
"scheme": "EIP-3009 transferWithAuthorization (x402 exact)",
"payment": {
"payTo": "0x36c3...",
"payer": "0x4c29...",
"amount": "0.01",
"symbol": "USDC"
},
"verified": true,
"confirmations": 3820001
}
}Tags
x402
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