sthan.io

sthan.io is a set of REST APIs for US addresses and IP location, made for developers. One HTTPS call, JSON back, API key authentication.

Products:

• Address Verification: checks a US address and returns the corrected address, ZIP+4, county and a deliverability status. Accepts one line of freeform text with misspellings, abbreviations and out-of-order parts. 100 free requests a month, then from $12 a month for 10,000.
• Address Parser: splits one line of freeform text into house number, street, unit, city, state and ZIP, with a confidence score. 100 free a month, then from $8 a month for 10,000.
• Address Autocomplete (US): address, city and ZIP suggestions as a user types, down to apartment and suite. 100,000 free a month, then from $7 a month for 100,000.
• Geocoding: address to latitude/longitude and back (forward and reverse on one plan), with an accuracy type and a confidence score on every result. 100 free a month, then from $5 a month for 10,000.
• IP Geolocation: city, region, country, postal code, coordinates and timezone for any IPv4 or IPv6 address, plus ASN, ISP, organization, and mobile, proxy and hosting flags. 50,000 free a month, then from $4.50 a month for 100,000.
• India: PIN code, city and locality autocomplete. 10,000 free a month, then from $2 a month for 50,000.

Every price is listed on the site, there are no sales calls, and no credit card is needed to start. Annual billing costs less than monthly on every plan. Docs, code samples, an OpenAPI spec and a Postman collection are at sthan.io/docs. An MCP server (@sthan/mcp-server on npm) lets Claude, Cursor and other AI assistants call the APIs, and a command-line tool (@sthan/cli) runs them from the terminal.