API Documentation
Every RAPID service, documented in one place.
Each service below is a REST endpoint over HTTPS, authenticated with an API key in the query string, returning JSON (or XML if you prefer). Pick a service for the full request syntax, response reference, and pricing — or try the live demo first, no key needed.
Addresses & location
One subscription covers all three — they share an API key and a monthly pool of lookups.
US Address Cleanse
Validate and standardize US addresses — deliverability, ZIP+4, county, carrier route, and geocoding.
Read the docs
Canadian Address Cleanse
Validate and standardize Canadian addresses, with FSA/LDU parsing and quality grades.
Read the docs
ZIP Code Information
Preferred city, state, and geographic center for any ZIP Code — perfect for form auto-fill.
Read the docs
Phones
Do Not Call
Check numbers against the Federal, State, and DMA Do Not Call lists before you dial.
Read the docs
Reverse Phone Append
Start with a phone number, get back the person or business behind it — with their address.
Read the docs
Residential Phone Append
Append a landline from a name and address, with confidence grades and carrier info.
Read the docs
Cell Phone Append
Append a cell phone number from a name and address.
Read the docs
Looking for the Rapid jQuery plugin — drop-in address validation and ZIP auto-complete for web forms? Its documentation still lives on our developer portal, alongside sign-up and key management.
Not sure which service fits?
Tell us what you're building and we'll point you to the right endpoints — usually the same day.