Sanctions screening

Overwatch continuously screens vessel ownership chains against OFAC, EU, UN, and OpenSanctions consolidated lists. When a match is detected, it appears in the unified alert inbox and on the vessel’s risk profile. Analysts can override matches as false positives or confirmed, and the audit endpoint tracks review rates over time.

Data sources

Sanctions screening fuses entities from multiple watchlists. The OpenSanctions default dataset is refreshed daily from the public bulk download and broadens coverage beyond the OFAC / EU / UN core lists to include politically exposed persons (PEPs) and additional national regimes.

Source	Coverage	Refresh	License
OFAC SDN	US Treasury Specially Designated Nationals	Daily	Public domain
EU consolidated	EU restrictive measures	Daily	EUPL
UN consolidated	UN Security Council sanctions	Daily	Public domain
OpenSanctions `default`	Consolidated sanctions + PEPs across global regimes	Daily	CC-BY 4.0

OpenSanctions entities are stored in canonical FollowTheMoney JSON. Match candidates use trigram similarity on the entity caption, then are reconciled against vessel ownership graphs before producing an alert. Attribution: data provided by OpenSanctions.

Sanctions overrides

`GET` `/api/v1/sanctions/overrides`

Requires API key.

List analyst overrides on sanctions matches. Use this to review false positive determinations and confirmed matches. Parameters

Name	Type	Description
`imo`	string	Filter by IMO number
`dedupe_key`	string	Filter by specific match deduplication key
`limit`	number	Default 50, max 200

Response

{
  "overrides": [
    {
      "dedupe_key": "9622629:ofac:sdn_entity_123",
      "imo_number": "9622629",
      "override_status": "false_positive",
      "reason": "Name similarity only — different registered owner confirmed via Equasis.",
      "created_at": "2026-04-15T10:00:00Z",
      "updated_at": "2026-04-15T10:00:00Z"
    }
  ],
  "count": 1
}

Example

curl -H "X-API-Key: YOUR_KEY" \
  https://axiomoverwatch.io/api/v1/sanctions/overrides?imo=9622629

`POST` `/api/v1/sanctions/overrides`

Requires API key.

Create or update an override on a sanctions match. The override persists and is factored into the vessel’s risk score. Parameters

Name	Type	Required	Description
`dedupe_key`	string	✓	Match deduplication key from the original alert
`override_status`	string	✓	`false_positive` or `confirmed_match`
`reason`	string		Analyst explanation

Example

curl -X POST -H "X-API-Key: YOUR_KEY" \
  -H "Content-Type: application/json" \
  https://axiomoverwatch.io/api/v1/sanctions/overrides \
  -d '{
    "dedupe_key": "9622629:ofac:sdn_entity_123",
    "override_status": "false_positive",
    "reason": "Name similarity only — different registered owner confirmed via Equasis."
  }'

Audit metrics

`GET` `/api/v1/sanctions/audit`

Requires API key.

Weekly audit metrics for sanctions screening: how many matches were reviewed, confirmed, or marked as false positives. Use this to track analyst review rates and model accuracy. Parameters

Name	Type	Required	Description
`weeks`	number		Number of weeks of history to return. Default 8, max 26.

Response

{
  "total_auto_matches": 245,
  "weekly": [
    {
      "week_start": "2026-04-14",
      "analyst_reviewed": 18,
      "analyst_confirmed": 12,
      "analyst_false_positive": 6,
      "confirmation_rate_reviewed": 0.667,
      "confirmation_rate_vs_auto": 0.049
    }
  ]
}

Example

curl -H "X-API-Key: YOUR_KEY" \
  https://axiomoverwatch.io/api/v1/sanctions/audit?weeks=12

Overview

Vessels & ports

Risk & anomaly

Operations & throughput

Sustainability & fleet

Satellite & geo

Commodities

Insurance

Trade & market

Platform

Data sources

Sanctions overrides

`GET` `/api/v1/sanctions/overrides`

`POST` `/api/v1/sanctions/overrides`

Audit metrics

`GET` `/api/v1/sanctions/audit`

​Data sources

​Sanctions overrides

​GET /api/v1/sanctions/overrides

​POST /api/v1/sanctions/overrides

​Audit metrics

​GET /api/v1/sanctions/audit

Data sources

Sanctions overrides

`GET` `/api/v1/sanctions/overrides`

`POST` `/api/v1/sanctions/overrides`

Audit metrics

`GET` `/api/v1/sanctions/audit`