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x402 Base USDC Payment Checker – Full History Deep Scan
x402
x402 Base USDC Payment Checker – Full History Deep Scan is a paid API for AI agents from paycheck.hectichustle.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-17).
Performs a full funding-history deep scan of a Base USDC payment by tx hash, verifying match, tracing funder provenance, and detecting address-poisoning risks with the x402 Trust Index.
Price / call$0.05
Success—
StatusUnknown
How this service works
Did this USDC payment settle, and who funded this wallet (the payer)? Deep Base verification: confirmations, payTo/amount match, fake-token and lookalike warnings, plus the payer's FULL inbound USDC history (no window), top funders, coverage stats and a recheckable sha256 receipt. Not charged if the index is down. Body {txHash, expectedPayTo?, expectedAmount?}.
Output
Returns a JSON object with: payment match status (payTo and amount), funding verdict (external vs self-funded), top funders with totals, full block coverage stats (from block 0 to chain tip), address-poisoning warnings, number of confirmations, RPC call count, price charged (0.05 USDC), and a human-readable summary string.
Example use cases
Audit new counterparty before releasing goods
“Before I release the digital goods, do a full deep-scan on Base tx 0xfc1e...279a to confirm it paid exactly 5 USDC to my address 0x509e55c4f898b43c856fb0e51048b1b7bfbc9ede, and tell me whether the payer's wallet was funded externally or by themselves.”
Detect address-poisoning in a disputed payment
“A customer claims they paid but I'm not sure they sent to the right address — can you run a deep scan on tx hash 0x87de...a3f1 on Base and check for any address-poisoning warnings, plus confirm the amount was 0.50 USDC to 0x509e55c4f898b43c856fb0e51048b1b7bfbc9ede?”
Verify x402 pay-per-call transaction with Trust Index
“I got a payment via x402 but the client is new to me — please deep scan tx 0xb22c...91fd on Base mainnet, give me their x402 Trust Index grade, and show me who their top funders are so I can assess whether this is a trustworthy payer.”
Technical details
Endpoint
POSThttps://paycheck.hectichustle.workers.dev/check/deep?utm_source=zero.xyzWhen to prefer
Choose this endpoint over the standard $0.01 checker when you need complete funding-history provenance (scanned from block 0), address-poisoning detection, x402 Trust Index grades, or when auditing a high-value payment from an unknown counterparty. Use the cheaper /check endpoint for simple tx confirmation of known senders.
Side effects
- Transaction hash not found on Base mainnet — returns found:false with optional EIP-3009 authorization fallback
- Amount or recipient mismatch — returns match.ok:false with specific mismatch fields
- Indexer temporarily unavailable — partial coverage with historyComplete:false
- Invalid tx hash format — schema validation error before processing
- Insufficient x402 payment — 402 response before scan executes
- Rate limiting from underlying RPC providers — delayed or partial response
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_deep",
"block": 52409752,
"found": true,
"match": {
"ok": true,
"payToMatch": true,
"amountMatch": true
},
"funding": {
"source": "blockscout",
"verdict": "external",
"topFunders": [
{
"from": "0x86bafb3916943fbba78e7add6c25a230ec27df44",
"count": 2,
"total": "161.651325"
}
],
"scannedBlocks": {
"to": 52409752,
"from": 0,
"history": "full",
"complete": true,
"windowBlocks": 52409753
}
},
"payment": {
"to": "0x509e55c4f898b43c856fb0e51048b1b7bfbc9ede",
"from": "0xfc1e390266f3b29179b5d63a7937a689d1e5279a",
"amount": "1"
},
"receipt": {
"reason": null,
"recheck": {
"hash": "0x…",
"hashAlg": "sha256(canonical JSON, keys sorted, no whitespace)",
"payload": {
"v": 2,
"chain": "eip155:8453",
"source": "blockscout",
"blockRange": {
"to": 52409752,
"from": 0
}
}
},
"verdict": "external",
"rpcCalls": 4,
"priceCharged": "0.05 USDC",
"blocksScanned": {
"to": 52409752,
"from": 0,
"complete": true
}
},
"summary": "1 USDC from 0xfc1e… to 0x509e… at block 52409752. Matches expected payment. Payer was funded externally.",
"coverage": {
"source": "blockscout",
"indexer": "blockscout pro (keyed)",
"complete": true,
"rpcCalls": 4,
"windowTo": 52409752,
"endpoints": [
"quicknode (keyed)"
],
"windowFrom": 0,
"coveragePct": 100,
"indexerPages": 1,
"windowBlocks": 52409753,
"blocksCovered": 52409753,
"getLogsChunks": 0,
"uniqueFunders": 1,
"historyComplete": true,
"inboundTransfers": 2
},
"warnings": [],
"confirmed": true,
"confirmations": 1200
}
}Tags
x402
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