mp3, 7 months ago (edited 7 months ago)

You can see the list of federated instances of each instance at example.com/instances

You can also get that data in json format by using example.com/api/v3/federated_instances

lemmy.readme.io/reference/getfederatedinstances

Mastodon and Lemmy are both using the ActivityPub protocol (Lemmy uses some extensions to federate downvotes and some other actions) to communicate between instances, but the API to interrogate a Mastodon, Lemmy, PixelFed or kbin instance will be different.