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Address Verification

Address Verification API

PostGrid's Address Verification system ensures deliverability and data integrity across 245+ countries and territories. Verify, standardize, and enrich addresses in real-time or batch with CASS & SERP certification, NCOA processing, and rich metadata enrichment. No separate fees for features.

Real-Time & Batch APIs

  • Single verification: POST /v1/addver/verifications — Verify structured or freeform addresses instantly
  • Batch processing: POST /v1/addver/verifications/batch — Verify up to 250K addresses in one request
  • Address completion & autocomplete: GET/POST /v1/addver/completions — Suggest & resolve addresses with zero lookup cost on preview
  • Intelligent fallbacks: POST /v1/addver/suggestions — Get corrected address candidates when verification fails

Rich Data Enrichment

  • CASS & SERP certified: Verify against USPS/Canada Post official databases with NCOA (National Change of Address)
  • Location intelligence: Geocoding (latitude/longitude), county data, census tract, DPV, RDI, carrier route
  • Advanced parsing: POST /v1/addver/parses — Extract structured components from freeform addresses
  • International support: POST /v1/intl_addver/verifications — Verify addresses globally with international completions
  • Inclusive pricing: All details, geocoding, and metadata included in a single lookup, no feature-based surcharges