# OFAC wallet screening API

Screen a crypto wallet address or a person or company name against the US Treasury OFAC SDN list, aliases included, and get a block, review or pass verdict with each match's SDN ID and programs.

## When an agent wants this

- Check an address before an agent pays it
- Add a sanctions step to onboarding or payouts
- Combine the sanctions result with wallet risk in one counterparty check

## Sanctions check (OFAC screening): SDN screening for a crypto wallet or name

Sanctions check (OFAC screening): SDN screening for a crypto wallet or name. $0.005 per successful call; failed calls are never charged.

Check a crypto wallet address against the OFAC SDN sanctions list before you pay it or accept funds: EVM (Ethereum, Base, Arbitrum, Polygon), BTC, USDT, TRX and more, or a person or company name with aliases. Returns a verdict (block on a listed address, review on a name match, pass), each match with SDN ID, programs and strength, and the list date. A screening aid, not legal advice. Use before paying; with wallet risk: check_counterparty.

Inputs: address: Crypto address to check (give address, name or both); name: Person or company name; matches when every word appears in a listed name or alias.

Free first (25 successful calls per caller, no key):

    curl "https://tools.funwords.eu/sanctions/check?address=0x098B716B8Aaf21512996dC57EB0615e2383E2f96&trial=1"

With a card key from https://tools.funwords.eu/credits, in a header or, when your client can only fetch a URL, in the URL:

    curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/sanctions/check?address=0x098B716B8Aaf21512996dC57EB0615e2383E2f96"
    curl "https://tools.funwords.eu/sanctions/check?address=0x098B716B8Aaf21512996dC57EB0615e2383E2f96&api_key=adt_…"

Without a key the same URL answers 402 with x402 and MPP terms, so a wallet client pays USDC per call and retries. Over MCP (https://tools.funwords.eu/mcp) this tool is sanctions_check.

Example result:

    {
      "query": {
        "address": "0x098B716B8Aaf21512996dC57EB0615e2383E2f96",
        "name": "Lazarus Group"
      },
      "verdict": "block",
      "listed": true,
      "matches": [
        {
          "sdnId": "…",
          "name": "LAZARUS GROUP",
          "type": "entity",
          "programs": [
            "DPRK3"
          ],
          "matchedOn": "address",
          "currency": "ETH",
          "address": "0x098B716B8Aaf21512996dC57EB0615e2383E2f96"
        },
        {
          "sdnId": "…",
          "name": "LAZARUS GROUP",
          "type": "entity",
          "programs": [
            "DPRK3"
          ],
          "matchedOn": "name",
          "matchedName": "LAZARUS GROUP",
          "score": 1
        }
      ],
      "list": "OFAC Specially Designated Nationals (SDN)",
      "listDate": "2026-10-17T20:15:00.000Z",
      "entries": 18000,
      "note": "Screening aid only: confirm any match against the official OFAC record before acting."
    }

Tool page: https://tools.funwords.eu/tools/sanctions-check

## Counterparty risk check: screen a payee's EVM address before paying (OFAC and on-chain signals)

Counterparty risk check: screen a payee's EVM address before paying (OFAC and on-chain signals). $0.01 per successful call; failed calls are never charged.

Screen a payee before paying, trading or onboarding: one call vets an address on Base, Ethereum, Arbitrum or Optimism with an OFAC SDN match, account type and activity, USD holdings and, on Base, wallet or contract risk checks; add the payee's domain for its age and trust flags. One block, review or pass verdict with reasons. Screening aid, not legal advice or a security audit. Use before paying, trading with or onboarding an address.

Inputs: address (required): 0x address to check; chain: Network: base (default), eth, arb or op; domain: Optional: the payee's domain or website URL, e.g. ethereum.org; adds domain age and trust flags.

Free first (25 successful calls per caller, no key):

    curl "https://tools.funwords.eu/check/counterparty?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&trial=1"

With a card key from https://tools.funwords.eu/credits, in a header or, when your client can only fetch a URL, in the URL:

    curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/check/counterparty?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
    curl "https://tools.funwords.eu/check/counterparty?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&api_key=adt_…"

Without a key the same URL answers 402 with x402 and MPP terms, so a wallet client pays USDC per call and retries. Over MCP (https://tools.funwords.eu/mcp) this tool is check_counterparty.

Example result:

    {
      "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
      "chain": "base",
      "verdict": "pass",
      "reasons": [],
      "sanctions": {
        "listed": false,
        "matches": [],
        "listDate": "2026-10-17T20:15:00.000Z"
      },
      "account": {
        "type": "eoa",
        "riskLevel": "low",
        "riskFlags": [],
        "accountNonce": 1234
      },
      "contract": null,
      "domain": {
        "name": "ethereum.org",
        "trust": "high",
        "ageDays": 4100,
        "registeredAt": "2015-03-21T00:00:00Z",
        "flags": []
      },
      "holdings": {
        "totalUsd": 1234.56,
        "tokensChecked": 9
      },
      "limitations": [],
      "note": "Screening aid only: confirm any sanctions match against the official OFAC record; heuristics are not a security audit."
    }

Tool page: https://tools.funwords.eu/tools/check-counterparty

## Questions

**Which list?** The OFAC SDN list, including the listed digital currency addresses, with the list date in every answer.

**Is this legal advice?** No. It is a screening aid; confirm a match against official OFAC records before acting.

Docs for agents: https://tools.funwords.eu/llms.txt · OpenAPI: https://tools.funwords.eu/openapi.json · All guides: https://tools.funwords.eu/guides