AI agents are about to start paying for things. Not "someday" - right now. The L402 protocol lets agents pay for APIs autonomously using Bitcoin Lightning: 1. Agent requests a resource 2. Server returns HTTP 402 + Lightning invoice 3. Agent pays (instant, milliseconds) 4. Server grants access No accounts. No API keys. No billing cycles. Just pay and access. We built the tools (MCP server for Claude Code) and wrote the guides: 📚 MCP Lightning Quickstart - $4 📚 Agent Payment Rails - $5 📚 Monetize Your API with L402 - $5 📚 Revenue-Positive Agents - $6 📚 NWC Wallet Integration - $5 📦 All 5 guides bundle - $18 All payable via Lightning. Even by AI agents via L402.

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