US Autocomplete vs US Extract

Smarty's US Autocomplete Pro API suggests valid, USPS-backed US addresses as a user types, turning a single free-form "search" string into a ranked list of deliverable candidates for checkout and signup forms, with optional city/state/ZIP filters to narrow the results. A separate "selected" parameter expands a chosen address into its individual secondary units (apartments, suites) when it resolves to more than one. It's part of Smarty's wider address-data platform, so one account and key also unlock the sibling US Street Address and US Extract APIs.

Smarty's US Extract API scans arbitrary blocks of text — emails, PDFs-turned-text, scraped web pages, free-text form fields — to locate and validate US postal addresses embedded inside them, rather than requiring the caller to already know where an address starts and ends. Each match comes back with the same standardized, USPS-checked components (city, state, ZIP+4, delivery-point data) as Smarty's dedicated street-address API, plus the surrounding text offsets. It shares billing and account access with the rest of Smarty's address-data platform, so an existing Smarty key also works here.