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x402 Base USDC Payment Checker
x402
x402 Base USDC Payment Checker is a paid API for AI agents from paycheck.hectichustle.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).
Verifies a Base mainnet USDC payment by transaction hash, checking confirmations, real USDC transfers, expected recipient/amount match, fake-USDC warnings, and payer funding source
Price / call$0.01
Success—
StatusUnknown
How this service works
Payment verification for x402: verify a USDC transaction on Base — did this payment really settle, and did it pay the right address the right amount? Send a tx hash (or x402 authorization): confirmations, real-USDC transfer check, expectedPayTo/expectedAmount match, fake-USDC and lookalike-address warnings, who funded the payer (external, self_funded, unknown), plain-English summary and a receipt. Body {txHash|authorization, expectedPayTo?, expectedAmount?}. Free demo: POST /demo.
Output
Returns a structured report including: number of confirmations, detected USDC transfer details, boolean match results for expectedPayTo and expectedAmount, fake-USDC and lookalike-address warnings, payer funding source classification (external | self_funded | unknown) with reason code (no_inbound_in_window | scan_incomplete), a plain-English summary of the payment status, and a receipt showing blocks scanned, RPC calls made, and cost.
Example use cases
Merchant payment verification before fulfillment
“Before I ship this order, verify that tx hash 0x4f2a...b9c1 on Base actually sent 0.50 real USDC to my store address 0xA1B2...C3D4, and let me know if there are any fake-token or scam-address red flags.”
Freelancer invoice payment confirmation
“I just got paid for a project — can you check Base transaction 0x7e3d...f012 and confirm it sent exactly 150 USDC to 0xMyWallet...9988, and tell me how the payer funded their wallet?”
Fraud detection on incoming crypto payment
“Someone paid me via Base with tx hash 0xc9a1...3344 — run a full check to see if it's a real USDC transfer, if the amount and recipient match, and whether the token contract looks legit or is a fake USDC lookalike.”
Technical details
Endpoint
POSThttps://paycheck.hectichustle.workers.dev/check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to cryptographically verify a specific Base mainnet USDC payment before fulfilling an obligation, especially when fraud risk is a concern. It is uniquely suited for detecting fake USDC tokens, lookalike recipient addresses, and tracing payer funding origin — features not typically available in generic block explorers. Prefer it over manual block explorer checks when you need a structured, machine-readable result with plain-English summary and fraud signals in a single API call.
Side effects
- Invalid or malformed txHash (not a valid 0x-prefixed 64-char hex) returns validation error
- Transaction not found on Base mainnet returns not-found error
- Transaction exists but involves no USDC transfer — mismatch flagged
- Fake or non-standard USDC contract detected — warning returned with details
- RPC rate limits or node connectivity issues may cause scan_incomplete funding classification
- expectedPayTo or expectedAmount mismatch returns failed verification with details
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | Optional (aliases asset, currency): "USDC" or the Base USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (apexfaucet-style). Any other token is a 400 unsupported_token, not charged. Responses always echo token "USDC". |
| txHash | string | Base mainnet transaction hash |
| minAmount | — | Optional floor (aliases min_amount, min): payment must be at least this many USDC; unlike expectedAmount it is not exact |
| authorization | object | Optional EIP-3009 authorization (x402 exact payload) to check when there is no tx or the tx is not found |
| expectedPayTo | string | Expected recipient (full-address, case-insensitive compare) |
| expectedPayer | string | Optional expected payer (aliases from, payer): the USDC Transfer's from must equal it |
| selfAddresses | array | Optional: other addresses you control; funding from them counts as self_funded |
| expectedAmount | — | Expected USDC amount, decimal (e.g. "0.01") |
Output
Schema · Response
{
"type": "json",
"example": {
"mode": "live_paid",
"block": 52409752,
"found": true,
"match": {
"ok": true,
"payToMatch": true,
"amountMatch": true
},
"funding": {
"verdict": "external",
"scannedBlocks": {
"to": 52409752,
"from": 52360000,
"complete": false,
"stoppedEarly": "enough recent funding found"
}
},
"payment": {
"to": "0x509e55c4f898b43c856fb0e51048b1b7bfbc9ede",
"from": "0xfc1e390266f3b29179b5d63a7937a689d1e5279a",
"amount": "1"
},
"receipt": {
"reason": null,
"verdict": "external",
"rpcCalls": 9,
"priceCharged": "0.01 USDC",
"blocksScanned": {
"to": 52409752,
"from": 52360000,
"complete": false
}
},
"summary": "1 USDC from 0xfc1e… to 0x509e… at block 52409752. Matches expected payment. Payer was funded externally.",
"warnings": [],
"confirmed": true,
"confirmations": 1200
}
}Tags
x402
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