Chainalysis

Chainalysis Sanctions Screening API

Free public REST API that returns whether a given crypto address is identified as sanctioned by OFAC, EU, or UN sanctions authorities. No commercial licence required; widely embedded by wallets, dApps, and exchanges to block sanctioned addresses at the perimeter. Requires a free API key supplied in the X-API-Key header - probed 2026-08-27, an invalid key returns HTTP 401 {"message":"Invalid API Key"}. Chainalysis ships the same sanctions data in a second, separate form: a permissionless on-chain oracle smart contract exposing isSanctioned(address), deployed across Ethereum, Polygon, BNB Smart Chain, Avalanche, Optimism, Arbitrum, Fantom, Celo, Blast, and Base, which needs no API key at all. The go.chainalysis.com document below covers the ORACLE; the REST reference is inside the gated developer portal.

Documentation GitHub

Documentation

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Documentation

https://go.chainalysis.com/chainalysis-oracle-docs.html

📖

Authentication

https://raw.githubusercontent.com/api-evangelist/chainalysis/refs/heads/main/authentication/chainalysis-authentication.yml

📖

RateLimits

https://raw.githubusercontent.com/api-evangelist/chainalysis/refs/heads/main/rate-limits/chainalysis-rate-limits.yml

Other Resources

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Website

https://www.chainalysis.com/product/address-screening/

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APIsJSON

https://raw.githubusercontent.com/api-evangelist/chainalysis/refs/heads/main/apis.yml

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API entry from apis.yml

aid: chainalysis:sanctions-screening
name: Chainalysis Sanctions Screening API
description: 'Free public REST API that returns whether a given crypto address is identified as sanctioned
  by OFAC, EU, or UN sanctions authorities. No commercial licence required; widely embedded by wallets,
  dApps, and exchanges to block sanctioned addresses at the perimeter. Requires a free API key supplied
  in the X-API-Key header - probed 2026-08-27, an invalid key returns HTTP 401 {"message":"Invalid API
  Key"}. Chainalysis ships the same sanctions data in a second, separate form: a permissionless on-chain
  oracle smart contract exposing isSanctioned(address), deployed across Ethereum, Polygon, BNB Smart Chain,
  Avalanche, Optimism, Arbitrum, Fantom, Celo, Blast, and Base, which needs no API key at all. The go.chainalysis.com
  document below covers the ORACLE; the REST reference is inside the gated developer portal.'
humanURL: https://www.chainalysis.com/product/address-screening/
baseURL: https://public.chainalysis.com/api/v1
tags:
- REST
- Sanctions
- Public
- OFAC
properties:
- type: Website
  url: https://www.chainalysis.com/product/address-screening/
- type: Documentation
  url: https://go.chainalysis.com/chainalysis-oracle-docs.html
- type: Authentication
  url: authentication/chainalysis-authentication.yml
- type: RateLimits
  url: rate-limits/chainalysis-rate-limits.yml