You can start playing around with the API endpoints without signing up, but there is a limit of 10 reqs/min. If you want to increase the rate limit, please contact Thanh Le. Also, you can find our OpenAPI spec here. Note: As of August 2025, we have updated our policy that API endpoints /v2/address/* now require API key to access. You must include header x-api-key in your requests to access these APIs.