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Base Payment Proof Verifier
x402
Base Payment Proof Verifier is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-13).
Verifies and risk-assesses a Base blockchain USDC payment transaction by checking its hash, recipient, and amount on-chain.
Price / call$0.03
Success—
StatusUnknown
How this service works
Verifies a Base transaction against an expected USDC payment recipient and amount, and returns proof details including transfer match and finality metadata.
Output
Returns a JSON object with network identifier (eip155:8453), product label (base-payment-proof), a risk assessment containing a risk_score (numeric), risk_level (e.g. 'low'), and any risk flags, plus activity, identity, and provenance metadata about the transaction.
Example use cases
Example prompt
“Can you verify that Base transaction 0x3a7f...c9d2 actually sent 5.00 USDC to 0xAbCd...1234 and tell me the risk score before I release the download?”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/base/payment-proofWhen to prefer
Use this endpoint when an AI agent needs to confirm that a specific Base blockchain USDC payment was executed with the correct amount and recipient before fulfilling an obligation, releasing goods, or logging compliance. Prefer this over generic blockchain explorers when you need a structured, machine-readable risk assessment with flags rather than raw on-chain data.
Side effects
- Invalid transaction hash format (not 0x + 64 hex chars) returns validation error
- Transaction not found on Base network returns not-found error
- Amount or recipient mismatch between on-chain data and query params may raise risk flags
- Network timeout or Base RPC unavailability may return 5xx error
- Missing required query params (tx, recipient, amount) returns 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "base-payment-proof",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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