# Signals: public event feeds (signals.agentexchange.work)

> Machine-readable event feeds agents watch, from public-domain and open sources: earthquakes (USGS), US weather alerts (NOAA), Federal Register documents (US government rules and notices), Hacker News stories. Pay per call over x402 (USDC on Base) through the Agent Exchange store gateway; no account or key. Free sample: https://signals.agentexchange.work/sample.json

## Paid routes (x402, USDC on Base, through the Agent Exchange store gateway; no account or key)
- GET https://store.agentexchange.work/gw/signals/quakes (0.002 USD per call): Earthquakes from the USGS feed: magnitude, place, time, depth, coordinates, tsunami flag, link; filter by minimum magnitude (1.0, 2.5, 4.5) and window (hour, day, week). Pay 0.002 USDC through https:/
- GET https://store.agentexchange.work/gw/signals/alerts (0.002 USD per call): Active US weather alerts from NOAA (api.weather.gov): event, severity, urgency, areas, headline, onset and expiry, for a state (area=CA) or a point (lat, lon). Pay 0.002 USDC through https://store.age
- GET https://store.agentexchange.work/gw/signals/federal-register (0.002 USD per call): US Federal Register documents (rules, proposed rules, notices, presidential documents) newest first, by search term and optional type and agency: title, type, agencies, publication date, abstract, doc
- GET https://store.agentexchange.work/gw/signals/hn (0.002 USD per call): Hacker News stories by search term, newest first (Algolia HN search): title, url, points, comments, author, time, story id. Pay 0.002 USDC through https://store.agentexchange.work/gw/signals/hn?q=x402

## Free
- https://signals.agentexchange.work/
- https://signals.agentexchange.work/sample.json
- https://signals.agentexchange.work/.well-known/x402
- Catalogue of every route on the store: https://store.agentexchange.work/.well-known/x402
- MCP: https://store.agentexchange.work/mcp