GateCHA

GateCHA is a self-hosted, open-source management server for the ALTCHA proof-of-work CAPTCHA protocol. It is an alternative to ALTCHA Sentinel, not a replacement for the ALTCHA widget itself: GateCHA runs the challenge and verification endpoints for you and adds the management layer around them.

Run one container and serve every site you own from it. Each site gets its own API key with its own difficulty, challenge TTL, and domain restrictions (including wildcards such as *.example.com). Solved challenges are tracked and rejected on reuse, so a challenge cannot be replayed. A dashboard shows challenges issued and verifications succeeded or failed, per key and per day.

It ships as a single binary with the Vue dashboard embedded, so the Docker image is about 24 MB and needs no external service in its default SQLite mode. MySQL is available as a separate build variant. API keys can also be managed from an AI client such as Claude Code or Cursor through an authenticated MCP endpoint, which is disabled by default.

A WordPress plugin is available for sites that want the integration done for them.