captcha.cc Human Verification

earonesty/captcha

Integrates captcha.cc's human verification service into your Claude workflow. Exposes challenge creation and verification endpoints that match the captcha.cc API structure: generate visual or audio CAPTCHAs with your site key, collect user responses, and verify proof tokens against their backend. Useful when you need to add CAPTCHA gates to automation workflows or validate user interactions before proceeding with sensitive operations. The server wraps their standard direct flow where the browser creates challenges and your backend calls siteverify with the secret key. Works over streamable HTTP, so you can drop it into existing MCP setups without additional transport configuration.

tools: 3
transport: HTTP
last updated: Apr 13, 2026

View on GitHub

Install

From registry metadata

$ npx add-mcp https://captcha.cc/mcp --name captchacc

Run in your terminal. add-mcp asks which agents to add it to (Claude Code, Codex, Cursor and more). Add -g to install it for every project.

Review the command, arguments and environment values before installing. MCP servers run with your local permissions.

Other ways

Claude Code

$ claude mcp add --transport http captchacc https://captcha.cc/mcp

Run in your terminal. Add --scope user to make it available in every project.

Tools

Verified live · 3 tools

Verified live against the running server on Nov 6, 2026.

make_widget_snippetReturn a minimal browser SDK snippet for mounting captcha.cc and submitting the proof token to an application endpoint.4 params

Return a minimal browser SDK snippet for mounting captcha.cc and submitting the proof token to an application endpoint.

Parameters* required

element_idstring

DOM element id where the widget should mount.default: captcha

form_idstring

Form id to attach submit handling to.default: contact-form

site_key*string

Public captcha.cc site key, for example pk_live_xxx.

submit_pathstring

Application endpoint that receives the proof token.default: /submit-form

make_siteverify_requestReturn a server-side fetch example for redeeming a captcha.cc proof token exactly once.2 params

Return a server-side fetch example for redeeming a captcha.cc proof token exactly once.

Parameters* required

proof_token_expressionstring

default: req.body.proofToken

secret_env_varstring

default: CAPTCHA_CC_SECRET_KEY

create_challengeCreate a live captcha.cc challenge for a site key and allowed hostname. Useful for smoke tests and integration checks.2 params

Create a live captcha.cc challenge for a site key and allowed hostname. Useful for smoke tests and integration checks.

Parameters* required

hostname*string

Hostname configured on the captcha.cc site.

site_key*string

Public captcha.cc site key.

Readme

Details

Repository: github.com/earonesty/captcha
Website: captcha.cc/docs/mcp
Category: Media & Entertainment
Transport: HTTP
Registry: MCP registry, active
Resources: 1
Tools verified: Nov 6, 2026

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