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API Usage Metrics

Daily request counts for each API hosted at api.water.usgs.gov, covering the most recent 30 days. Counts come from the api.data.gov analytics service, which meters every request routed through the API gateway.

The vertical axis is logarithmic, so equal vertical distances represent equal ratios rather than equal differences — a series an inch above another is roughly ten times larger, not slightly larger.

This chart requires JavaScript. The underlying data is published as JSON at /metrics/manifest.json, which names the current data file.

How to read these numbers

  • Every series is measured the same way: all requests of any status or method, with only Zabbix monitoring traffic excluded. The series are therefore directly comparable to one another.
  • The Geoserver series tracks the legacy GeoServer WFS, which is being retired. It is charted deliberately: watching its use fall is how we judge when it can be switched off. New work should use the Hydrologic Fabric service instead — see Migration from Legacy GeoServer .
  • Counts measure requests reaching the API gateway, not distinct users, sessions, or successfully answered queries. They include requests the gateway answered or rejected on its own — a rate-limited request is counted here even though it never reached a USGS server.
  • The window ends one day before the data was last fetched, so the most recent full day may be absent.