PostGrid Address Verification
PostGrid Address Verification is a real-time postal address validation solution for verifying, validating, standardizing, autocorrecting and enriching all of your customers' addresses with our CASS and SERP certified address database. With our Standard address verification API you can easily validate US and Canadian addresses real-time. With our International Address Verification API, you can verify addresses across 245+ countries globally. Ensure your customer's addresses are up to date and ensure accurate mail deliverability.
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Zip-Codes.com
Production REST API for US and Canadian postal-code data. Capabilities: address validation and standardization with ZIP+4 append, radius search (centroid haversine to 500 mi, or true spatial polygon intersection to 250 mi with per-result percent-inside), point-to-point distance and bearing, multi-entity autocomplete (cities, ZIPs, counties, metros, FSAs, school districts), per-ZIP enrichments — Census ACS demographics across 14 years (542 fields), congressional, state legislative, and school district lookups.
Six endpoints accept US ZIP, ZIP+4, Canadian FSA, Canadian postal, or lat/lon coordinates. Batch processes up to 100 inputs. REST/JSON over HTTPS, API-key auth, CORS, OpenAPI 3 spec, public Postman collection.
Free tier: 2,500 requests/day, no credit card, no expiration. Paid: Developer $49/mo, Professional $149/mo, Business $499/mo. Credit packs $19–$799.
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MaxCASS OS
MaxCASS OS is Anchor Software’s CASS™ Certified software solution for standardizing United States Postal Service®(USPS) delivery addresses, and updating mailing lists and customer databases with the most complete, correct, and current address information available. MaxCASS OS can be used for batch processing of large mailing lists, or in real-time mode for quick address look-ups. MaxCASS OS is available with integrated MaxMover functionality. By integrating MaxMover, Anchor Software’s certified interface for the USPS NCOA® program, Anchor provides its USPS certified solution for address correction / standardization, and change-of-address processing in a single pass of mailing lists. Address data quality is a key element in developing customer relationships. Address verification and validation tools are an integral part of a robust overall data governance plan and an essential tool in today's business environment.
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Service Objects Address Validation
One in five addresses contains errors that can result in late or undeliverable mail and shipments. Our address validation US service verifies and corrects addresses to ZIP+4, ensuring addresses are valid and deliverable, avoiding costly shipping and customer service issues. Encompassing multiple authoritative sources, our validation engine leverages over 160 million USPS addresses, as well as an additional 15 million non-postal addresses to validate and correct US mailing and shipping addresses with unparalleled precision. Our engine surpasses the stringent requirements of the USPS, exceeding their CASS (Coding Accuracy Support System) accuracy standards. Our software focuses on address precision, significantly mitigating costs associated with undeliverable, lost, or returned mail. Whether shipping products or mailing invoices, Service Objects Address Validation ensures delivery while avoiding costly address correction fees from the USPS and third-party shippers.
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