Notes
What changed when X moved to API v2
The practical differences from v1.1: versioned endpoints, opt-in fields, and OAuth 2.0 PKCE, for anyone porting a client.
Building on the free tier without hitting a wall
What the X API free tier allows, the documented posting limits, and how to design a small tool that stays inside them.
Self-hosting an open-source X client
A checklist for running an open-source X client on your own machine: credentials, secrets, a reverse proxy, and staying current.