Lanyard is a free service that makes it super easy to export your live Discord presence to an API endpoint (api.lanyard.rest/v1/users/:your_id) and to a WebSocket for you to use wherever you want - for example, to display what you're listening to on Spotify on your personal website. It also acts as a globally-accessible KV store which you can update from the Lanyard Discord bot or from the Lanyard API.

If you just want to display your Discord presence on a website or read it through the API, you do not need an API key. You only need an API key to manage custom key/value data in your Lanyard KV store. Keep it private and never include it in frontend code.

Please refer to the GitHub readme for any details: https://github.com/phineas/lanyard#readme