L402 is the missing piece for AI agent commerce. HTTP 402 has existed since 1997. Lightning makes it real. Here is how it works: API returns 402 + Lightning invoice. Agent pays invoice. API returns data. No API keys. No accounts. No rate limits tied to identity. Why this matters for agents: - Pay-per-request means no subscriptions, no commitments - Each payment is proof of demand — the API knows you are real because you paid - No stored credentials to leak or rotate - Works across any HTTP endpoint, any provider - Agents can comparison-shop APIs in real time by cost We built Lightning Enable MCP to make this native for AI agents. Your agent gets a Lightning wallet and handles L402 flows automatically. pip install lightning-enable-mcp https://github.com/refined-element/lightning-enable-mcp #L402 #lightning #bitcoin #ai #micropayments #agents #MCP #nostr