How much does a Mastodon route cost?

Each Mastodon route charges one credit per completed request, except the custom emoji list, which charges two because a server sends its whole catalogue in one answer. A completed answer is billed even when lookupStatus is not_found, restricted, unsupported or not_compatible, and a name with no DNS record is one of those billed 200 answers. HTTP error responses (400, 401, 402, 502 and 503) are free. The price on the endpoint page is the billing source of truth, each page of a list or timeline is billed separately, and meta.creditsCharged on every response is the final word. New accounts start with 100 free credits.