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Is there a Letterboxd API for films and members?
Yes. Social Fetch has 16 Letterboxd routes under /v1/letterboxd: film, filmography, member, watched films, diary, reviews, one review, watchlist, lists, one list, followers, following, activity, tags, statistics and popular members. Authenticate with your Social Fetch API key in x-api-key.
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This answer comes from Letterboxd data API, which covers the full detail, endpoints and pricing in credits.