# Numbers API The Bird Numbers API gives you an overview of the available MessageBird phone numbers and allows you to purchase as well as manage all your phone numbers. The Numbers API uses HTTP verbs and a RESTful endpoint structure with an access key that is used as the API Authorization. Request and response payloads are formatted as JSON using UTF-8 encoding and URL encoded values. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.bird.com/api/numbers-api.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.