Executive Summary
Researched all 5 Tier 2 government APIs with live data verification. OFAC SDN: 19,014 entries, free CSV download, no auth, ~2-3 hrs integration.
📊 Key Findings
OIG LEIE: 83,257 records, free CSV, ~1-2 hrs. NSOPW: confirmed API endpoint (nsopw-api.ojp.gov), Cloudflare-protected, ~4-6 hrs with Playwright. SAM.gov: daily exclusion extracts via REST API, requires free account + API key, ~3-5 hrs. PACER: $0.10/page with $30/quarter waiver, requires account + session auth, ~8-12 hrs. Delivered working Python integration assessment (tier2_gov_apis_assessment.py, 550 lines) with example calls for each source. Recommended order: OFAC → SAM.gov → NSOPW → OIG LEIE → PACER. Total: 18-28 hours for all 5; MVP (OFAC + SAM.gov) = 5-8 hours.