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

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

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.

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

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