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LION OFAC Sanctions Screen (x402, keyless)
x402
LION OFAC Sanctions Screen (x402, keyless) is a paid API for AI agents from lion-x402.lionmaster-operations.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Screens a blockchain address against the US Treasury OFAC SDN sanctions list and returns a sanctioned/not-sanctioned verdict with confidence score, no API key required.
Price / call$0.005
Success—
StatusUnknown
How this service works
Keyless off-chain and on-chain data for AI agents. No API key, no signup - payment is the only gate. Pay-per-call in USDC on Base via x402.
Output
Returns a JSON object containing: the name of the sanctions list checked (US Treasury OFAC SDN), the snapshot date of the list, the queried address, whether it matched (sanctioned: true/false), a confidence score (0–1), the asset/list ID, the resolution status, and the total number of sanctioned addresses in the dataset.
Example use cases
Screen wallet before DeFi swap
“Before I execute this token swap with 0x3f5CE5FBFe3E9af3971dD833D26bA9b5C936f0bE, can you run an OFAC sanctions check on that address? I don't want to interact with a sanctioned entity.”
Verify recipient for crypto payment
“I'm about to send USDC to 0xd90e2f925DA726b50C4Ed8D0Fb90Ad053324F31A — can you screen that wallet against the US Treasury OFAC SDN list first to make sure it's safe to pay them?”
AML check for new counterparty
“We just received a transaction from 0x7F367cC41522cE07553e823bf3be79A889debe1B and I need to know if that address is on any OFAC sanctions lists before we process the funds on our end. Can you run a compliance check?”
Technical details
Endpoint
GEThttps://lion-x402.lionmaster-operations.workers.dev/api/x402/sanctions-screen-jsonWhen to prefer
Use this endpoint when you need a fast, keyless, pay-per-call OFAC sanctions screening for a single blockchain/Ethereum address without signing up for a compliance data provider. Ideal for AI agents in DeFi, crypto payments, or Web3 workflows that need on-demand AML compliance checks at $0.005 per call with no subscription overhead.
Side effects
- Invalid or malformed Ethereum address returns an error or unresolved result
- Payment failure via x402 blocks the request with a 402 Payment Required response
- Stale snapshot if the OFAC list has not been refreshed recently (check snapshot_as_of)
- Address not found returns sanctioned: false but resolved: true, not an error
- Network or worker timeout on the Cloudflare Workers edge
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"list": "US Treasury OFAC SDN (Specially Designated Nationals)",
"as_of": "2026-06-03T00:00:00.000Z",
"match": "0x8589427373D6D84E98730D7795D8f6f8731FDA16",
"address": "0x8589427373D6D84E98730D7795D8f6f8731FDA16",
"asset_id": "LION_OFAC_SANCTIONS_001",
"resolved": true,
"confidence": 1,
"sanctioned": true,
"snapshot_as_of": "2026-06-03",
"total_sanctioned_addresses": 1234
}
}Tags
x402
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