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x402 Address-Poisoning Check – Full History (Base USDC)
x402
x402 Address-Poisoning Check – Full History (Base USDC) is a paid API for AI agents from paycheck.hectichustle.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-17).
Performs a deep full-history scan of a sender/recipient address pair to detect address-poisoning attacks, lookalike addresses, and dust transfers on Base USDC.
Price / call$0.005
Success—
StatusUnknown
How this service works
Full-history address-poisoning check before you send USDC on Base. Same risk/lookalike/seenBefore logic as /address/check, but funding history comes from ONE Blockscout index call (x402, up to the sender's 500 most recent Base USDC transfers; v2 page fallback) so coverage is usually the sender's full Base USDC history. Body {from, to}. Not charged if the index is down. Cheap partial/RPC tier: POST /address/check ($0.001).
Output
Returns a JSON object containing: overall risk level (low/medium/high), human-readable reasons for the risk rating, a list of lookalike addresses with their patterns (e.g. dust_or_zero_value), sample poisoning transaction hashes, inbound/outbound counts for each lookalike, full coverage metadata (blocks scanned, transfer count, counterparty count, completeness percentage), whether the address pair has been seen before, and the price charged for the scan.
Example use cases
Pre-payment address safety check
“Before I send USDC on Base to 0xccd53f97ddfdf6939028698803dfe20fac455d07 from my wallet 0xfc1e390266f3b29179b5d63a7937a689d1e5279a, run the full history poisoning scan and tell me if any lookalike addresses have appeared in my transaction history.”
Investigating suspected clipboard hijack
“I think someone may have poisoned my wallet address book — can you do a full deep scan for address-poisoning lookalikes between 0xfc1e390266f3b29179b5d63a7937a689d1e5279a as sender and 0xccd53f97ddfdf6939028698803dfe20fac455d07 as recipient, and show me any suspicious dust transfers?”
Routine DeFi security audit before large transfer
“I'm about to send a large amount of USDC on Base and want to be sure my recipient 0xccd53f97ddfdf6939028698803dfe20fac455d07 hasn't been mimicked by a poisoning attack — run the complete history scan from my address 0xfc1e390266f3b29179b5d63a7937a689d1e5279a and give me the risk assessment.”
Technical details
Endpoint
POSThttps://paycheck.hectichustle.workers.dev/address/check/full?utm_source=zero.xyzWhen to prefer
Choose this full-history endpoint (over the standard address-poisoning check) when you need complete blockchain coverage from block 0 to current — not just a recent window — and when the higher cost ($0.005 vs lighter checks) is acceptable for high-value transfers or thorough security audits. Prefer this when you need 100% coverage confidence, full counterparty enumeration, and comprehensive lookalike detection across the entire address history on Base.
Side effects
- Invalid address format (non-0x or wrong length) returns a validation error
- Missing 'to' or 'from' fields returns a bad request error
- Payment not received or underpaid results in 402 Payment Required response
- Blockscout indexer unavailable may return incomplete coverage with historyComplete: false
- Address with zero transaction history returns low-data result with limited coverage
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | Intended recipient (aliases: recipient, toAddress) |
| from | string | Sender address (aliases: sender, fromAddress). Required for /full. |
| chain | — | Optional. Base only. |
| token | string | Optional. USDC only. |
| contacts | array | Optional: up to 50 trusted addresses / address book (aliases: known_addresses, known). |
Output
Schema · Response
{
"type": "json",
"example": {
"to": "0xccd53f97ddfdf6939028698803dfe20fac455d07",
"from": "0xfc1e390266f3b29179b5d63a7937a689d1e5279a",
"mode": "live_paid_full",
"risk": "medium",
"reasons": [
"you have paid 'to' before, but 1 lookalike(s) also appear (poisoning attempt): keep using the full address you verified"
],
"coverage": {
"source": "blockscout",
"indexer": "blockscout x402 (paid page)",
"complete": true,
"rpcCalls": 1,
"windowTo": 52410000,
"scannedTo": 52410000,
"windowFrom": 0,
"coveragePct": 100,
"scannedFrom": 0,
"indexerPages": 1,
"windowBlocks": 52410000,
"transfersSeen": 12,
"counterparties": 10,
"historyComplete": true
},
"lookalikes": [
{
"address": "0xccd560c57ca850ec6465008fdbc55d3b32b75d07",
"inbound": 0,
"pattern": "dust_or_zero_value",
"realOut": 0,
"outbound": 1,
"sampleTx": "0xf34c5e5ecd6a10e63133633f3d0108019f2667bd6c0557390e01dd6c8ca4ddd4",
"lastBlock": 52377228,
"dustTransfers": 1
}
],
"seenBefore": true,
"priceCharged": "0.005 USDC"
}
}Tags
x402
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