The MPP registry — 100+ Machine Payments Protocol tools, SDKs, services, and payment methods across 15+ chains. The definitive directory for Stripe + Tempo agent payments.

MCP server for 402 Index: discover 15,000+ paid API endpoints across L402, x402, and MPP

Expose any toll-booth-gated API as a NIP-90 Data Vending Machine on Nostr

Claude Code skill for x402 protocol development - provides expert guidance for building x402-based servers and payment-gated APIs

Bridge between toll-booth and 402-announce — announce your toll-booth service on Nostr for decentralised paid API discovery

Nostr-native crawler that discovers L402 and x402 paid APIs and publishes kind 31402 events

402.pub — ecosystem landing page + live service directory for Lightning-paid APIs

29 Nostr protocol extensions (NIPs) for service coordination, trust, payments, disputes, key hierarchy, resource curation, and paid API discovery. Every NIP works independently -- no platform lock-in.