To use the API you need an API key. You can get a free one by simply signing up here.

Once you have your API key, you have to put it in the request URL for every request you make like so ?api-key=YOUR-API-KEY.

Attention: Only the first query parameter is prefixed with a ? (question mark), all subsequent ones will be prefixed with a & (ampersand). That is how URLs work and nothing related to our API. Here's a full example with two parameters api-key and text:

Alternatively, you can put the API key in the request header as x-api-key.