Nostr: npub1mgvlrnf5hm9yf0n5mf9nqmvarhvxkc6remu5ec3vf8r0txqkuk7su0e7q2
Nostr-native crawler that discovers L402 and x402 paid APIs and publishes kind 31402 events for decentralised service discovery.
The indexer finds paid APIs across multiple channels and announces them on Nostr so clients like 402-mcp and the 402.pub directory can discover them.
- Active prober — HTTP probe for
WWW-Authenticate: L402and402 Payment Requiredheaders - Nostr aggregator — Subscribe to existing kind 31402 events across relays
- GitHub scanner — Search GitHub for repos using L402/x402 patterns
- npm scanner — Find packages depending on toll-booth, aperture, and other L402 libraries
- Community listener — Accept kind 1402 suggestion events from users
Discovered services are verified daily. Endpoints that become unreachable are marked stale and eventually delisted, keeping the directory accurate.
# Install
pnpm install
# Build and run
pnpm build
pnpm startThe indexer reads from JSON files in config/ and environment variables:
| Variable | Required | Default | Description |
|---|---|---|---|
INDEXER_SECRET_KEY |
Yes | -- | 64-char hex Nostr secret key for signing events |
GITHUB_TOKEN |
No | -- | GitHub API token for GitHub scanner channel |
HEALTH_STATE_PATH |
No | health-state.json |
Path to health check state file |
Relay URLs and seed URLs are loaded from config/relays.json, config/seed-urls.json, and config/x402-seeds.json.
| Package | Purpose |
|---|---|
| toll-booth | L402 middleware — gate any API behind Lightning |
| 402-announce | Publish kind 31402 service announcements |
| 402-mcp | AI agents discover, pay for, and consume 402 APIs |
| 402.pub | Live service directory |
| 402-indexer | Crawl and index paid APIs (this repo) |
MIT