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Is there a Discord API for public server data?
Yes. Social Fetch has seventeen routes under /v1/discord: invite, server page, server widget, directory browse, directory search, server index, game index, application index, announcement index, trending games, game page, application, similar applications, application collections, template, announcement channel, and announcement post. Authenticate with your Social Fetch API key in x-api-key.
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This answer comes from Discord data API, which covers the full detail, endpoints and pricing in credits.