# OFAC SDN Blockchain Address Screener

> OFAC SDN Blockchain Address Screener is a paid API for AI agents from sanctions.nsgoods.org, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Screens a blockchain address against the OFAC Specially Designated Nationals (SDN) list and returns a cryptographically signed verdict indicating whether the address is sanctioned

## Facts

- Endpoint: GET https://sanctions.nsgoods.org/screen
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ofac-sdn-blockchain-address-screener-5b8f02e1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IUo1IwsQ0ShtuLwCHP0qj

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ofac-sdn-blockchain-address-screener-5b8f02e1
```

Example prompt: Before I send this USDC payment, can you screen the Ethereum address 0x1234abcd... against the OFAC SDN list and give me a signed verdict confirming whether it's sanctioned or clean?

## When to prefer this

Choose this endpoint when you need a cryptographically signed, auditable OFAC sanctions verdict for a blockchain address — particularly when compliance records requiring non-repudiable proof are needed. It supports multi-chain addresses (EVM, Bitcoin, Solana, Tron, etc.) and charges only $0.005 USDC per call, making it cost-effective for high-volume screening. Prefer it over unverified or unsigned screening tools when you need a verifiable signature for audit trails or regulatory documentation.

## Known failure modes

- Missing 'address' query parameter returns a 400-level error
- Malformed or invalid address format may return an error or an unmatched result
- SDN snapshot may be slightly stale if not recently refreshed (sdn_snapshot_at indicates age)
- Network or service unavailability returns a 5xx error
- Payment failure or insufficient USDC balance causes a 402 Payment Required response
- Unsupported chain format may result in advisory mismatch since matching is global by address value

## How this service works

Signed multi-chain OFAC SDN address screening (USDC on Base or Solana)

## Output

A JSON object containing: the queried address, a boolean 'sanctioned' field, a verdict string ('clean' or 'deny'), the signing key identity ('signed_by'), a cryptographic signature over the result, the optional chain hint, the matched SDN label if applicable, and a timestamp of the SDN snapshot used for the check.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "chain": {
       "type": "string",
       "description": "Chain hint, e.g. ethereum/bitcoin/solana/tron. Advisory — matching is global by address value."
      },
      "address": {
       "type": "string",
       "description": "Raw blockchain address (EVM 0x-hex, or base58/bech32 for BTC/SOL/TRX/etc.)."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "address",
      "sanctioned",
      "verdict",
      "signed_by",
      "signature"
     ],
     "properties": {
      "chain": {
       "type": [
        "string",
        "null"
       ]
      },
      "address": {
       "type": "string"
      },
      "verdict": {
       "enum": [
        "deny",
        "clean"
       ],
       "type": "string"
      },
      "signature": {
       "type": "string"
      },
      "signed_by": {
       "type": "string"
      },
      "sanctioned": {
       "type": "boolean"
      },
      "matched_label": {
       "type": [
        "string",
        "null"
       ]
      },
      "sdn_snapshot_at": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ofac-sdn-blockchain-address-screener-5b8f02e1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sanctions.nsgoods.org](https://www.zero.xyz/host/sanctions.nsgoods.org/llms.txt)