6 Free Public Record APIs for Building Automated Background Checks

If you're building any kind of verification or screening workflow -- vendor onboarding, provider credentialing, compliance checks -- you probably know that commercial data providers charge per query. What most people don't realize is that the underlying data comes from government databases that are free to query. You just need to know which APIs exist and how to call them. Here are 6 public record APIs I've integrated into automated pipelines. 1. NPPES NPI Registry (Healthcare Provider Verification) Every healthcare provider in the US has a National Provider Identifier. The NPPES API lets you search by name, NPI number, specialty, or location. Use case: Credentialing automation. Verify that a provider is who they claim to be, check their specialty, and confirm their practice address. API: Free, no key required. Returns JSON. Rate-limited but generous. If you need bulk lookups or want clean pagination, this wrapper handles it. 2. SEC EDGAR Full-Text Search (Public Company Verification)