captcha.cc Human Verification
cc.captcha/captchacc
Documentation
Installation
Connect your MCP client to the hosted Streamable HTTP endpoint at https://captcha.cc/mcp. No local server package install is required.
Configuration
- Browser integration uses the published
@captchacc/browserpackage. - Server-side verification uses
CAPTCHA_CC_SECRET_KEY. - Add the frontend hostname to the captcha.cc site allowlist.
- Browser requests must include credentials if shared clearance is enabled.
Capabilities
- Create challenges with
POST /v1/challenges. - Verify answers with
POST /v1/verify. - Redeem proof tokens once with
POST /v1/siteverify. - Support shared clearance when a site explicitly enables it.
Limitations
- Shared clearance is off by default.
- Proof tokens are single-use.
- Verification fails if you use the site key instead of the secret key.
- Hostname mismatches must be corrected in the site allowlist.