# check-sanctions / watchlist re-screener

> check-sanctions / watchlist re-screener is a paid API for AI agents from api.firstmention.uk, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).

Re-screens a named watchlist of counterparties against US OFAC, UK OFSI, and EU sanctions lists to flag newly sanctioned entities within a configurable look-back window

## Facts

- Endpoint: GET https://api.firstmention.uk/s/check-sanctions/watchlist?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/check-sanctions-watchlist-re-screener-42b64492
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nWqbtF-KGWobjNwoL9LtQ

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 check-sanctions-watchlist-re-screener-42b64492
```

Example prompt: Re-screen my counterparty watchlist — names are 'Acme Trading|Global Exports Ltd|Ivan Petrov' — against OFAC, OFSI, and EU sanctions lists for the last 60 days and flag anyone newly sanctioned, using a match threshold of 0.80.

## When to prefer this

Choose this watchlist endpoint when you have an existing set of counterparties you need to periodically re-screen for newly imposed sanctions — it is optimized for delta monitoring (newly_sanctioned flag) rather than one-off onboarding checks. It covers all three major Western sanctions regimes (US OFAC, UK OFSI, EU) in a single call, handles non-Latin name transliteration automatically, and guarantees no false clears on unscreenable names. Prefer it over ad-hoc name-screening endpoints when you need a recurring compliance workflow or when you care specifically about change detection over a configurable look-back window.

## Known failure modes

- 400 returned for names that cannot be screened (e.g. unrecognizable scripts not transliteratable), never a false clear
- Fuzzy threshold out of range (below 0.5 or above 1.0) may cause rejection
- Exceeding 50 pipe-separated names per call returns an error
- Look-back window beyond 400 days is rejected
- Payment failure (x402 USDC on Base) results in 402 response before screening occurs

## How this service works

Re-screen your own counterparty list in one call; pass names separated by | or , and get flagged entries back.

## Output

Returns a JSON object listing each screened name with a flagged boolean, best fuzzy match score, and matched sanctions list entries; plus a summary of total watched names, total flagged, newly sanctioned names and their count, the look-back window used, and any notes (e.g. if a name was unscreenable).

## 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"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "required": [
      "names"
     ],
     "properties": {
      "names": {
       "type": "string",
       "description": "Your counterparties separated by | or , ."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "clean": {
       "type": "number"
      },
      "count": {
       "type": "number"
      },
      "lists": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "stale": {
          "type": "boolean"
         },
         "records": {
          "type": "number"
         },
         "data_date": {
          "type": "string"
         },
         "jurisdiction": {
          "type": "string"
         }
        }
       }
      },
      "flagged": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "list": {
          "type": "string"
         },
         "name": {
          "type": "string"
         },
         "match": {
          "type": "boolean"
         },
         "best_score": {
          "type": "number"
         }
        }
       }
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/check-sanctions-watchlist-re-screener-42b64492/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.firstmention.uk](https://www.zero.xyz/host/api.firstmention.uk/llms.txt)