SHARE vs USGS Water Services

SHARE (now internally rebranded "trove", version 26.0.0 as of this check) is the Center for Open Science's free aggregator of metadata about research and scholarly activity, pulling in tens of millions of records from sources like CrossRef and OSF and re-indexing them for keyless search. Its v2 API exposes an Elasticsearch-backed search endpoint plus RSS and Atom feeds, all reachable with no registration.

USGS Water Services is a keyless REST API serving real-time and historical streamflow, groundwater, and water-quality readings from thousands of USGS monitoring sites across the US, in WaterML XML, JSON, or the legacy tab-delimited RDB format. The agency has announced it will decommission this API family in early 2027 in favor of its new Water Data APIs (api.waterdata.usgs.gov), with no degradation planned before August 2026 — new integrations should target the successor service.