Sanctions screening against US OFAC, UK OFSI and EU lists with real matching on
Sanctions screening against US OFAC, UK OFSI and EU lists with real matching on all three. Screen a name, a wallet address, a batch, or your own watchlist. Non-Latin names are transliterated; unscreenable names return 400, never a false clear.
Answeringour last check, 2026-10-31
1 of 1checks answered this week
861 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://api.firstmention.uk/s/check-sanctions/watchlist
| Category | Company and compliance |
|---|---|
| Provider host | api.firstmention.uk |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-31 | valid payment request | 402 | $0.01 | 861 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"days": 30,
"names": "Rosneft|Acme Widgets Ltd|Gazprom",
"threshold": 0.85
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"headers": {
"additionalProperties": {
"type": "string"
},
"type": "object"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"properties": {
"days": {
"description": "Look-back window in days (default 30, max 400).",
"type": "number"
},
"names": {
"description": "Pipe-separated counterparty names to re-screen, up to 50.",
"type": "string"
},
"threshold": {
"description": "Fuzzy match threshold 0.5-1.0 (default 0.85).",
"type": "number"
}
},
"required": [
"names"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"flagged": {
"items": {
"type": "string"
},
"type": "array"
},
"flagged_count": {
"type": "number"
},
"newly_sanctioned": {
"items": {
"type": "string"
},
"type": "array"
},
"newly_sanctioned_count": {
"type": "number"
},
"note": {
"type": "string"
},
"results": {
"items": {
"properties": {
"best_score": {
"type": "number"
},
"flagged": {
"type": "boolean"
},
"matched_names": {
"items": {
"type": "string"
},
"type": "array"
},
"name": {
"type": "string"
},
"newly_sanctioned": {
"type": "boolean"
}
},
"type": "object"
},
"type": "array"
},
"watched": {
"type": "number"
},
"window_days": {
"type": "number"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}