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Creators producing and editing audio, particularly teams that run software on their own infrastructure and AI agents that connect over MCP — free to start, source available on GitHub.
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Freemium
Catalogue record
github.com
captcha-mcp
📇 🏠 🍎 🪟 🐧 - L402 Lightning paywall + Hashcash proof-of-work gate for MCP tool calls. Free tier solves a PoW challenge; paid tier pays a Ligh...
Checked Oct 27, 2026Evidence completeness: evidenceREADME refreshed Oct 16, 2026
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Useful context before you commit.
📇 🏠 🍎 🪟 🐧 - 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.
Best for
Creators producing and editing audio, particularly teams that run software on their own infrastructure and AI agents that connect over MCP — free to start, source available on GitHub.
Known limitations
Teams that need a vendor SLA before adopting a free tool — check the project's support terms first.
Verify current plan terms with the provider.
Evidence summary
Known limitations
Teams that need a vendor SLA before adopting a free tool — check the project's support terms first.
Catalogue confidence
Catalogue data checked Oct 27, 2026.
GitHub-backed record with source-attributed context.
Repository context
@powforge/captcha-mcp
GitHub / zekebuilds-lab/captcha-mcp
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