Summary
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.
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Tools
Public tool metadata for what this MCP can expose to an agent.
3 tools
challengeRequest a fresh PoW challenge from the PowForge captcha service. Returns {id, salt, difficulty, signature, instructions}. The agent must find a nonce such that SHA-256(salt + nonce) has at least `difficulty` leading zero bits, then call the verify tool. Free tier — no payment...
Request a fresh PoW challenge from the PowForge captcha service. Returns {id, salt, difficulty, signature, instructions}. The agent must find a nonce such that SHA-256(salt + nonce) has at least `difficulty` leading zero bits, then call the verify tool. Free tier — no payment...
No parameter schema in public metadata yet.
verifyVerify a PoW solution. Input: {salt, nonce, id, signature, algo?, difficulty?} from a prior challenge call plus the nonce the agent computed. Returns a 5-minute HMAC-signed token on success, or {valid: false, reason} on failure. Tokens can be re-verified server-side via POST /...6 params
Verify a PoW solution. Input: {salt, nonce, id, signature, algo?, difficulty?} from a prior challenge call plus the nonce the agent computed. Returns a 5-minute HMAC-signed token on success, or {valid: false, reason} on failure. Tokens can be re-verified server-side via POST /...
Parameters* required
idstringChallenge id from the challenge response
algostringHash algorithm. Default: 'sha256'
saltstringHex salt from the challenge response
noncestringNonce string the agent computed
signaturestringHMAC signature from the challenge response
difficultynumberLeading zero bits required. Default: matches challenge.
statusReturn PowForge captcha server health, lifetime stats (pow_solves, ln_skips, challenges_issued), and L402 endpoint metadata (scope, price_sats, paid endpoint URL). Use this to discover the Lightning skip price before paying, or as a liveness check.
Return PowForge captcha server health, lifetime stats (pow_solves, ln_skips, challenges_issued), and L402 endpoint metadata (scope, price_sats, paid endpoint URL). Use this to discover the Lightning skip price before paying, or as a liveness check.
No parameter schema in public metadata yet.
Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →
