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Search: proof-of-work
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MCP Server
Maintained
zekebuilds-lab/captcha-mcp
L402 Lightning paywall + Hashcash proof-of-work gate for MCP tool calls. Free tier solves a PoW challenge; paid tier pays a Lightning invoice via self-hosted LNBits. No accounts, no API keys, no third-party SaaS. Drop-in middleware for any MCP server. `npx @powforge/captcha-mcp`.