Free ChatGPT plan supported?

Custom GPTs need ChatGPT Plus or above. The letspost.it side is free-tier accessible regardless.

Where's the OpenAPI spec?

https://api.letspost.it/openapi.json — auto-generated from the NestJS DTOs, always in sync with production.

Yes — when generating a key, pick the scopes (read-only vs publish). The Custom GPT can then only do what the key allows.

ChatGPT · Custom GPTs · OpenAPI actions

letspost.it ships an OpenAPI spec ready to drop into a Custom GPT's Actions config. ChatGPT can compose, schedule, and publish on your behalf.

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Setup

Free tier, one-click create in your dashboard.

In ChatGPT → My GPTs → Create. Add an Action; paste the letspost.it OpenAPI URL: https://api.letspost.it/openapi.json

In the Action's auth, pick API Key → header → Authorization: Bearer lp_live_... Save.

What you can do

"Write 5 LinkedIn posts about today's release and queue them for next week." ChatGPT does it.

Feed it a blog post; ask for a TikTok script, IG carousel copy, and X thread — all scheduled.

Make the GPT private to your workspace. Everyone on your team posts via the same draft assistant.

FAQ

Free ChatGPT plan supported?: Custom GPTs need ChatGPT Plus or above. The letspost.it side is free-tier accessible regardless.
Where's the OpenAPI spec?: https://api.letspost.it/openapi.json — auto-generated from the NestJS DTOs, always in sync with production.
Can I scope the API key to draft-only?: Yes — when generating a key, pick the scopes (read-only vs publish). The Custom GPT can then only do what the key allows.

Free tier. No card required. Live in minutes.

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