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database api · rest + mcp · source-linked

Clinical Trial Data API

Search clinical trial records from five registry sources through one API.

Built for Data engineers, systematic-review teams, health-data products, and research groups that need registry records for analysis rather than patient recruitment or trial operations.

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record and matching

Understand what one result represents

Official trial registries expose different identifiers, fields, statuses, and delivery methods. ClinicalTrials.gov-only APIs and databases need additional ingestion and reconciliation to support five-source registry analysis.

Five registry sources, one response contract

Search ClinicalTrials.gov, EU CTIS, EudraCT, ISRCTN, and licensed DRKS records through one contract for title, condition, intervention, sponsor, phase, status, country, registry, and exact registry ID. Responses retain the primary registry identifier and source record URL.

  • The downloadable evaluation sample is delivered by email; the smaller keyless API fixture is only for transport and response-shape testing.
  • Paid REST and MCP access use the same canonical trial model.

Registry data for analysis, not trial operations

Review measured source contributions, field-fill rates, date ranges, and exact multi-registry matches before integration. The contract supports registry research and analytics; it does not provide patient matching, recruitment, site selection, CTMS, or EDC workflows.

measured release evidence

Coverage claims carry a date and definition

Evaluate field completeness, source scope, freshness, record grain, and provenance against the dated full release—not against the evaluation bundle alone.

Included trials
702,863

Canonical trial rows in the current dated release; this is not an upstream registry total.

ClinicalTrials.gov contributions
609,551

Distinct exported canonical trials with an active ClinicalTrials.gov source contribution in the measured release.

EU CTIS contributions
12,749

Distinct exported canonical trials with an active EU CTIS source contribution in the measured release.

EudraCT contributions
44,415

Distinct exported canonical trials with an active EU Clinical Trials Register source contribution in the measured release.

ISRCTN contributions
28,931

Distinct exported canonical trials with an active ISRCTN source contribution in the measured release.

Licensed DRKS contributions
7,578

Distinct exported canonical trials with an active DRKS contribution admitted by the registered-from-2025 or last-updated-in-2025 licence gate.

Freshness policy
Weekly refresh

Maximum age 8 days. Oldest measured source refresh: 2026-11-02.

Weekly publication requires complete evidence no more than eight days old for four full registry crawls, the licensed DRKS slice, Health Canada CTD, and exact-edge PubMed.

Coverage methodologySources and licencesProvenance model

limitations

Know the limits before purchase

Coverage is measured for the five included registry sources and must not be generalized beyond them or beyond the licensed DRKS slice.
Registry-reported facts require source review before regulated, clinical, publication, or patient-facing use.
Not a census of registries beyond the five named sources, and not the historical DRKS corpus outside its licensed slice.
Not a patient recruitment, trial matching, investigator intelligence, or site-selection platform.
Not medical, regulatory, or clinical decision advice.

next step

Evaluate the data before you buy

Download a representative sample by email, review current coverage, and choose the access model that fits your workload.

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Related evaluation guides

Connect this diligence evidence to the relevant integration decision.