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Base Pay-To Address Screen
x402
Base Pay-To Address Screen is a paid API for AI agents from api.x402risk.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Screens a Base (EVM) address against OFAC SDN sanctions, detects address-poisoning lookalikes, checks contract vs EOA status, and returns a block/caution/ok verdict with labels and risk reasons.
Price / call$0.005
Success—
StatusUnknown
How this service works
Pay-to / counterparty address screen for Base: exact match against OFAC SDN published digital currency addresses (daily refresh, list date included), contract vs EOA, Blockscout verification, first-seen age and tx count, lookalike (address-poisoning) check vs an optional compare_to, labels, and a block/caution/ok verdict. $0.005 USDC. Screening aid only, not a compliance clearance or legal advice.
Output
Returns a JSON object with a verdict field (block, caution, or ok), sanctions match details including SDN name/program/list date, contract vs EOA classification, address activity stats (tx count, first-seen age), lookalike detection result vs compare_to, address labels, data sources used, and a disclaimer. A 'block' verdict means an exact OFAC SDN match was found.
Example use cases
Pre-payment sanctions check for DeFi wallet
“I'm about to send USDC to 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD on Base — can you screen it against OFAC first and tell me if it's blocked or safe?”
Address poisoning detection before withdrawal
“My wallet history shows a recent transfer to 0x1234567890abcdef1234567890abcdef12345678 but I'm not sure it's the real recipient — screen it against OFAC and compare it to my intended address 0x1234567890abcdef1234567890abcdef12345679 to see if I'm being poisoned.”
Compliance review of counterparty address
“Our compliance team needs to know if the counterparty address 0xdAC17F958D2ee523a2206206994597C13D831ec7 on Base is on any OFAC sanctions list — run a full screen and show me the sanctions details and verdict.”
Technical details
Endpoint
POSThttps://api.x402risk.com/v1/address-screen?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need fast, pay-per-call OFAC SDN screening of a specific Base (chain 8453) EVM address before executing a payment or trade, especially when you also want address-poisoning detection, contract/EOA classification, and labels — all in one call for $0.005 USDC. Prefer it over generic blockchain explorers when you need a structured, machine-readable compliance verdict with sanctions list metadata rather than a manual lookup.
Side effects
- Invalid address format (not a valid 0x EVM address) returns a validation error
- Address not yet indexed on Blockscout may result in incomplete activity data with first_seen_is_lower_bound=true
- OFAC SDN list may lag real-world updates by up to one day due to daily refresh cycle
- compare_to address that is itself malformed causes lookalike check to fail
- Network or RPC errors may result in partial source data with errors array populated
- Payment failure (insufficient USDC or x402 protocol error) prevents the call from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string | EVM address to screen (Base, chain 8453) |
| compare_to | string | Optional intended recipient address; flags a lookalike (address-poisoning) match |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"cached": false,
"errors": [],
"labels": [],
"status": "ok",
"address": "0x098B716B8Aaf21512996dC57EB0615e2383E2f96",
"product": "address-screen",
"reasons": [
"exact match to an OFAC SDN digital currency address (LAZARUS GROUP; list date 2026-09-23)"
],
"sources": [
"ofac-sdn",
"base-rpc",
"blockscout"
],
"verdict": "block",
"activity": {
"tx_count_indexed": 0,
"outgoing_tx_count": 0,
"first_seen_age_days": 798.4,
"first_seen_is_lower_bound": false
},
"chain_id": 8453,
"contract": null,
"lookalike": null,
"sanctions": {
"list": "OFAC SDN (Specially Designated Nationals) - digital currency addresses",
"matches": [
{
"sdn_uid": "23036",
"programs": [
"DPRK3"
],
"sdn_name": "LAZARUS GROUP",
"sdn_type": "Entity",
"currency_tag": "ETH"
}
],
"list_date": "2026-09-23",
"sanctioned": true
},
"disclaimer": "Screening aid only, not a compliance clearance or legal advice. Sanctions result is an exact match against EVM-format digital currency addresses published in the OFAC SDN list as of list_date; a non-match does not mean an address or its owner is not sanctioned or is safe. On-chain facts and labels come from public sources and can be incomplete.",
"sanctioned": true,
"is_contract": false,
"block_number": 35000000,
"schema_version": "1.0",
"eip7702_delegated_eoa": false
}
}Tags
x402
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