Smarty
Smarty leads the way in location data intelligence, offering a comprehensive suite of address validation APIs for USPS, non-postal, and international addresses. Our address autocomplete API simplifies data entry, and our geocoding and reverse geocoding APIs deliver hyper-accurate results at lightning speed. From New York to Jakarta, Smarty covers the globe, standardizing, validating, and enriching address data. Our fully documented APIs and unlimited tech support make us the top choice for USPS and international address validation solutions. Whether you're in Tokyo or Toronto, our comprehensive documentation and exceptional customer support make it easy to start validating addresses in minutes. With 250 free lookups per month, no credit card required, and a full demo available, Smarty has you covered. From address validation to list processing, we've got every detail you need. Our service ensures security with 24-hour monitoring, encryption, and hashed data, delivering an average sub-3
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PAV API
PAV (Postal Address Verification) is a CASS Certified™ API that allows you to standardize, correct, and validate U.S. and Canadian addresses in one step. Save time, money, and resources by verifying that addresses are deliverable before mailings or packages are sent out. PAV helps businesses ensure data quality for U.S. and Canadian customers. When verifying a Canadian address, the API will only verify the city, state, and ZIP Code. The province name must be abbreviated in order for PAV to append a missing ZIP Code to a verified Canadian address. CDYNE offers trial license keys for all web services so that you may test the APIs for free. Postal Address Verification (PAV) is an API (Application Programming Interface). The API allows a business's IT department to configure the Web Service on a web page, application, or database with a few lines of code. There is no software to buy or install, no complex system to learn, and the service's data is automatically updated each month.
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Firstlogic
Validate and verify your address data by checking them against official Postal Authority databases. Increase delivery rates, minimize returned mail and realize postal discounts. Connect address datasources to our enterprise-class cleansing transforms. Then, you'll be ready to validate and verify your address data. Increase delivery rates, minimize returned mail and realize postal discounts. Identify individual data elements within your address data and break them out into their component parts. Eliminate common spelling mistakes & format address data to comply with industry standards & improve mail delivery. Confirm an address’s existence against the official USPS address database. Check whether the address is residential or business and if the address is deliverable using USPS Delivery Point Validation (DPV). Merge validated data back to multiple disparate data sources or produce customized output files to use in your organization's workflow.
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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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