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AgentResolver — x402 Settlement Verification
x402
AgentResolver — x402 Settlement Verification is a paid API for AI agents from agentresolver.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-17).
Verifies a completed x402 USDC payment transaction on Base mainnet, confirming settlement status, EIP-3009 transfer shape, recipient address, and amount.
Price / call$0.001
Success—
StatusUnknown
How this service works
Continuously check whether AI agents can discover, call and pay your API, MCP server or x402 service. Free live checks and GitHub Action monitoring.
Output
Returns a JSON object with: settled (boolean indicating successful on-chain transfer), verdict (one of 'verified', 'reverted', 'not_usdc_eip3009', 'expectation_mismatch', 'not_found'), paymentShape (one of 'eip3009-exact', 'other', 'unknown'), and transferCount (integer number of USDC transfers found in the transaction).
Example use cases
Post-payment settlement audit
“I just paid an x402 API and got transaction hash 0x4a2f...b391 back — can you verify it actually settled on Base as a valid USDC EIP-3009 transfer before I trust that my request will be fulfilled?”
Recipient and amount mismatch check
“Check transaction 0xd7e3...9c12 and confirm the USDC went to 0xABCDEF1234567890abcdef1234567890ABCDEF12 for exactly 1000000 atomic units — fail closed if anything looks off.”
Reverted transaction diagnosis
“My x402 payment may have reverted — can you look up transaction 0x8b1a...44f7 on Base and tell me the verdict, whether it settled, and what the payment shape was?”
Technical details
Endpoint
GEThttps://agentresolver.vercel.app/api/x402-settlement-verify?utm_source=zero.xyzWhen to prefer
Use this endpoint after an x402 payment has been submitted to Base mainnet and you need cryptographic confirmation that the settlement occurred correctly before unlocking a resource or proceeding with a workflow. It is specifically designed for EIP-3009 USDC transfer verification in the x402 protocol context, making it more appropriate than a generic blockchain explorer when you need structured verdict, payment shape classification, and optional expectation matching in a single call.
Side effects
- Transaction hash not found on Base mainnet — verdict: not_found
- Transaction reverted on-chain — verdict: reverted
- Transfer is not a USDC EIP-3009 transfer — verdict: not_usdc_eip3009
- Recipient address or amount does not match expectations — verdict: expectation_mismatch
- Invalid transaction hash format (must match ^0x[0-9a-fA-F]{64}$) — 400 bad request
- Network latency or RPC unavailability causing lookup failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"settled": true,
"verdict": "verified",
"paymentShape": "eip3009-exact",
"transferCount": 1
}
}Tags
x402
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