Sanctions List Checker API

Description

Create a lightweight REST API service that checks Ethereum addresses against OFAC SDN and EU consolidated sanctions lists. The service should download and cache sanctions data, provide fast lookups, and return structured results indicating match status and confidence. Must handle fuzzy matching for entity names.

Requirements

• REST API with /check/:address endpoint
• OFAC SDN list integration
• EU consolidated sanctions list integration
• Local caching with configurable TTL

Acceptance Criteria

• Returns match/no-match within 100ms (cached)
• Updates sanctions data on configurable schedule
• Handles invalid addresses with proper errors
• OpenAPI spec included