Health 201 · Data Catalog Public health data · 2026-08-09

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ClinicalTrials.gov API v2

NIH / NLM

Source homepage API endpoint Documentation

Access tierOPEN-API Queryable API, automatable end to end.
Access methodREST API
AuthenticationNone
RegionGlobal
Topicsclinical-trials interventions results
Finest geographysite
Update cadencedaily
Statusverified · last checked 2026-08-08
Registry idclinicaltrials-v2

Quirks & gotchas

Classic API retired 2024 — v2 only. Essie query syntax. Full bulk zip available.

Related sources on the same topics

Provenance

Catalog contents: 114 public health data sources
Source of record: registry/sources.yaml in the HealthDataWhiz repository
Built: 2026-08-09
Machine-readable: catalog.json (CC-BY, reuse freely)
This entry: clinicaltrials-v2 in registry/sources.yaml
Last verified: 2026-08-08

This catalog describes where public health data lives and how to access it. It is not medical advice, and it does not host or redistribute the data itself — always read each source's own documentation, licence, and suppression rules before using it. Access details drift; entries carry the date we last verified them. Sources marked RESTRICTED are listed for reference only — they require an application or data-use agreement and we never automate access to them.