US Autocomplete
Enter address data quickly with real-time address suggestions.
About US Autocomplete
US Autocomplete Pro is an API from Smarty that returns address suggestions as users type, matching input against fully verified USPS addresses. It uses fuzzy logic to handle missing directionals and street suffixes, and allows substitution or partial spelling of street suffixes and secondary designators (for example, ST for AVE, or STR/STREET both matching ST).
The API accepts GET requests over HTTPS at a dedicated endpoint and supports filtering and preference parameters, including common state collections, ZIP codes, and searching on alternate city names, to help narrow results when multiple cities share a state or when disambiguation is needed. It also supports secondary number expansion for addresses with unit or apartment designators.
This is a predecessor product line still current alongside a newer version of US Autocomplete, with a migration guide available for moving between the two. It is intended for developers integrating US address autocomplete functionality into forms or applications, with a free testing account option and SDKs available for multiple programming languages.
Key features
- Returns address suggestions that are fully verified USPS addresses
- Uses fuzzy logic to allow missing or substituted street directionals and suffixes
- Filters and preferences support multiple cities within a single state
- Supports ZIP Codes as filter and preference values
- Allows searching on alternate city names
Frequently asked questions
Is there a free tier for testing?
Yes, free testing accounts are available.
What HTTP methods does the API support?
The API supports GET for single input requests and OPTIONS for pre-flight cross-domain requests; only GET is allowed when using embedded key authentication.
What kind of address data does it return?
It returns suggestions that are fully verified USPS addresses.
How do I construct a request URL?
Requests use HTTPS to the host us-autocomplete-pro.api.smarty.com at the /lookup path with a query string containing your embedded key.
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