Best Address Verification Software for Claude

One API key covers US address work for developers: verification with ZIP+4, county and a deliverability status; parsing of a single freeform line into street, unit, city, state and ZIP with a confidence score; type-ahead address, city and ZIP suggestions; forward and reverse geocoding with an accuracy type on each result; and IP lookups that return location plus ASN, ISP and mobile, proxy and hosting flags. India PIN code, city and locality autocomplete is included. Messy input is fine. Each product has a free monthly allowance with no credit card; address verification begins at $12 a month for 10,000 requests, prices are public, and yearly billing is cheaper than monthly. Docs, an OpenAPI spec, a Postman collection, an MCP server and a CLI are available.