402 Index

# 402 Index > Protocol-agnostic directory of paid APIs (L402 + x402 + MPP) for AI agents. Live at: https://402index.io Currently indexing: 17896 endpoints (1035 L402, 15984 x402, 877 MPP) ## API Base URL: https://402index.io/api/v1 API_SPEC: https://402index.io/api/v1/openapi.json API_DOCS_MD: https://402index.io/api/v1/docs.md - GET /api/v1/services — Search and filter endpoints. Params: protocol, category, health, source, q, sort, limit, offset, l402_format, lnget_compatible - GET /api/v1/services/:id — Full service details with health check history - GET /api/v1/categories — Category tree with counts - GET /api/v1/health — System health, sync status, provider counts - GET /api/v1/opportunities — Ecosystem gap analysis (coverage, protocol, provider gaps) - POST /api/v1/register — Register an L402 endpoint (verified via probe) - GET /api/v1/export.csv — Full directory CSV export (L402 payment required) ## Distribution - GET /feed.xml — RSS 2.0 feed with l402:service XML namespace. Params: protocol, health, type - POST /api/v1/webhooks — Register for real-time notifications (HMAC-SHA256 signed) - GET /api/v1/webhooks/:id — Check webhook status (X-Webhook-Secret header) - DELETE /api/v1/webhooks/:id — Remove webhook (X-Webhook-Secret header) ## MCP Server An MCP server is available for direct AI assistant integration. Tools: search_services, get_service_detail, list_categories, get_directory_stats Setup: See mcp-server/ directory or npm install @402index/mcp-server ## Protocols - L402: Lightning-native HTTP 402 paywall. Returns WWW-Authenticate header with macaroon + invoice. - x402: Chain-agnostic HTTP 402 paywall (Base, Solana). Returns payment requirements in structured header. - MPP: Machine Payments Protocol (Stripe/Tempo). Returns WWW-Authenticate: Payment header with intent and method.