A drop-in MCP middleware that adds payment gating to tool calls using Lightning Network payments or proof-of-work challenges. Enables monetization without accounts or third-party services.
captcha-mcp is a Model Context Protocol (MCP) server middleware that implements L402 Lightning paywall functionality combined with Hashcash proof-of-work mechanisms. It provides two-tier access control for MCP tool calls: a free tier requiring users to solve computational proof-of-work challenges, and a premium tier accepting Lightning Network payments processed through self-hosted LNBits infrastructure.
Clone the repository from GitHub and install dependencies. Configure your LNBits instance for Lightning payments (optional, for paid tier). Deploy the MCP server as middleware in front of your existing MCP tools. No API keys, user accounts, or third-party SaaS integration required—operates entirely on your infrastructure.
Monday.com MCP Server streamlines board management, item operations, and workflow automation for teams. I…
by NotionFlow
Sentry MCP Server provides comprehensive error tracking and performance monitoring, helping developers id…
by AnalyticsPro
Cloudflare MCP Server simplifies Cloudflare management by providing tools for DNS management, Workers dep…
by PricingBot