{"slug":"zekebuilds-lab/captcha-mcp","name":"captcha-mcp","description":"L402 Lightning paywall and PoW gate for MCP tool calls. Free tier solves a Hashcash challenge; paid tier pays a Lightning invoice via self-hosted LNBits. No accounts, no API keys.","category":"other","tags":[],"official":false,"stars":0,"transport":"stdio","install":[{"cmd":"npx -y @powforge/captcha-mcp","imports":[]}],"tools":[{"name":"challenge","description":"Request a fresh proof-of-work puzzle. Returns {id, salt, difficulty, signature}."},{"name":"verify","description":"Submit a solved nonce. Returns a 5-minute HMAC-signed access token."},{"name":"status","description":"Server health, lifetime stats, L402 endpoint metadata."}],"env_vars":["CAPTCHA_URL"],"auth_type":"none","github":"https://github.com/zekebuilds-lab/captcha-mcp","homepage":"","server_url":"","status":"active","source":"mcpservers.org","updated_at":"Mon May 25"}