What is your API for? Will Henderson Updated July 07, 2016 06:13 Follow Our API allows developers to convert 3 words to latitude, longitude coordinates and vice-versa. To use the API you need to sign up for an API key. Related articles How do I convert a large number of lat,long coordinates to 3 words? How much does it cost? Can I download a database of the words? How do I partner with what3words? Can I use your logo in an app I am developing? Comments 0 comments Article is closed for comments.