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PayPerByte Sanctions Screening Oracle
x402
PayPerByte Sanctions Screening Oracle is a paid API for AI agents from x402.payperbyte.io, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-13).
Screens a crypto address or counterparty name against OFAC SDN and Consolidated sanctions lists, returning a BLOCK/PASS verdict with EIP-712 cryptographic attestation
Price / call$0.1
Success—
StatusUnknown
How this service works
Know-Your-Agent counterparty screening — sanctions pillar. Signed OFAC SDN + Consolidated screen on an address or name, pinned to the exact list-state (date + sha256). Screens the counterparty you supply — not the calling agent's identity. Full scope: https://x402.payperbyte.io/feeds
Output
A JSON object containing: a verdict field (BLOCK or PASS), a score, an array of reasons explaining any match (including the exact SDN entry number and list name), the exact OFAC list state screened against (source, published date, SHA-256 content hash, entry count, staleness flag), the methodology version, and an EIP-712 attestation block with the signer address, signature, payload hash, and domain details (chainId 421614 = Arbitrum Sepolia signing namespace). The signer can be recovered from the attestation to verify authenticity and tamper-evidence.
Example use cases
Pre-payment DeFi compliance check
“I'm about to send 50,000 USDC to 0x1da5821544e25c636c1417ba96ade4cf6d2f9b5a on Ethereum — can you screen that address against OFAC sanctions first and give me the signed verdict before I proceed?”
Counterparty name sanctions screening
“We're onboarding a new business partner called 'Lazarus Group' — can you run their name through the OFAC SDN list and send me back the verdict with the cryptographic proof so our compliance team can log it?”
Automated wallet blacklist check for a dApp
“My app needs to block sanctioned users — can you check if the address 0x7F367cC41522cE07553e823bf3be79A889debe1B is on the OFAC sanctions list and return the attested result with the list version details?”
Technical details
Endpoint
POSThttps://x402.payperbyte.io/feeds/sanctions-screenWhen to prefer
Choose this endpoint when you need a cryptographically attested, verifiable sanctions verdict that you can independently verify on-chain — not just a raw database query. It is ideal for DeFi applications, payment agents, and compliance workflows that require tamper-evident proof of which exact OFAC list version (SHA-256 anchored) was consulted and that the result was signed by the feed's own publisher key. Prefer this over generic sanctions APIs when you need EIP-712 receipts for audit trails, on-chain verifiability, or when operating in trustless agent pipelines where data provenance must be cryptographically proven rather than assumed.
Side effects
- Missing both address and name fields — API returns 400 requiring at least one of address or name
- Invalid address format (not 0x+40-hex or recognized digital-currency format) — rejected at input validation
- Payment failure via x402 protocol — endpoint returns 402 Payment Required if USDC payment is not attached
- OFAC list temporarily stale — stale:true flag in list_state indicates the list could not be refreshed
- Attestation signer mismatch — if recovered signer does not match expected publisher key, data may be tampered
- Name with fewer than 2 characters or more than 256 characters — rejected by minLength/maxLength constraints
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| name | string | Counterparty name (individual or entity). Screened exact + conservative fuzzy against primary and a.k.a. names in the SDN + Consolidated lists. |
| chain | string | Optional, informational only — the SDN annex pins addresses to currency symbols; chain never gates a hit. |
| address | string | Counterparty address: 0x+40-hex (EVM) or a digital-currency address. Checked against the OFAC SDN digital-currency annex. |
Output
Schema · Response
{
"type": "json",
"example": {
"_note": "Excerpt of a real answer (live service, 2026-07-01); hash/signature elided, signals/consolidated trimmed. Every answer pins the exact OFAC list version (published date + sha256 + entry count) it was judged against. Screening signal, not legal advice. The EIP-712 receipt — domain chainId 421614 = Arbitrum Sepolia, a frozen signing namespace, not a settlement rail — proves who signed these exact bytes (authenticity + tamper-evidence), not that the screening result is correct. Recompute keccak256(canonical answer bytes) and recover the signer before acting.",
"answer": {
"v": "sanctions-screen/v1",
"query": {
"name": "Lazarus Group",
"chain": null,
"address": null
},
"score": 0,
"reasons": [
"name exactly matches OFAC SDN primary name \"LAZARUS GROUP\": entry #27307 \"LAZARUS GROUP\" [DPRK3] — list published 2026-06-30"
],
"verdict": "BLOCK",
"list_state": {
"sdn": {
"stale": false,
"source": "OFAC SDN (Specially Designated Nationals and Blocked Persons)",
"entry_count": 19129,
"content_sha256": "a04efa5d60104ebd35fc08b6891811120d151bf37801fbd3c01e64380198f099",
"published_date": "2026-06-30"
}
},
"methodology": "ss-v1"
},
"attestation": {
"domain": {
"name": "BYTE Library",
"chainId": 421614,
"version": "1",
"verifyingContract": "0x44729bB148F46d8Db509E47b0453edc271e06e95"
},
"signer": "0x344ECaCDe6566294c31397445c98b62a3EEEA456",
"signature": "0x…",
"payloadHash": "0x…"
}
}
}Tags
x402
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