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Postbase is configured with environment variables. Only the core Supabase keys are required; everything else enables an optional capability.

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Core

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Media storage (R2 / S3)

Set your bucket credentials to enable the media library (R2_* / S3-compatible keys) and configure the bucket’s CORS to expose the ETag header for multipart uploads.

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Platforms

Each platform you publish to needs its own OAuth app and keys (X, LinkedIn, Instagram/Facebook, TikTok, YouTube). Add the keys and the channel’s Connect button lights up. Channels stay hidden until their provider is configured.
X charges for API use. Your self-hosted install posts through your own X developer app, so X bills your developer account for every call. At the time of writing that’s about 0.015perpost,0.015 per post, 0.20 per post with a link and $0.005 per post read for stats. Check the current rates in your X developer console before you connect X. The other platforms are free to post to.

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Optional

A capability that isn’t configured is simply hidden in the UI — the app runs fine with just the core Supabase setup.