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Clinical Trials API - ClinicalTrials.gov, ISRCTN, EU CTIS

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Clinical trials API: search ClinicalTrials.gov, ISRCTN and the EU CTIS register in one call and get deduplicated trial records in a unified schema, with per-registry status on every row and optional patent linkage. Query by condition, drug, sponsor or status. Keyless, official registries.

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from $3.30 / 1,000 results

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Developer

Kyle Maloney

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21 days ago

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Automation

Trial title

title

Optional

Brief title of the clinical trial.

Type:string | null

Example:

Anti-MART-1 F5 Cells Plus ALVAC MART-1 Vaccine to Treat Advanced Melanoma

Official title

official_title

Optional

Full official/scientific title of the study.

Type:string | null

Status

status

Optional

Overall recruitment/study status.

Type:string | null

Example:

TERMINATED

Phase

phase

Optional

Trial phase(s).

Type:string | null

Example:

PHASE2

Study type

study_type

Optional

Interventional or observational study type.

Type:string | null

Example:

INTERVENTIONAL

Enrollment

enrollment

Optional

Number of participants enrolled/targeted.

Type:number | null

Example:

Conditions

conditions

Optional

Medical conditions studied.

Type:string[]

Interventions

interventions

Optional

Drugs, devices, or procedures tested.

Type:string[]

Countries

countries

Optional

Countries where the trial has sites.

Type:string[]

Start date

start_date

Optional

Study start date.

Type:string | null

Example:

2008-01

Completion date

completion_date

Optional

Study completion date.

Type:string | null

Example:

2011-03

Last update

last_update

Optional

Date the registry record was last updated.

Type:string | null

Source registries

registries

Optional

Every registry this unified trial was found in (source, id, url).

Type:object[]

All identifiers

all_ids

Optional

All cross-registry IDs (NCT/ISRCTN/EudraCT) for this trial.

Type:string[]

Registry count

source_count

Optional

Number of registry ENTRIES merged into this row. Two records from the SAME registry that merged on a shared identifier count as 2. For genuine cross-registry coverage read distinct_registry_count or cross_registry instead.

Type:number | null

Example:

Multi-registry

multi_registry

Optional

True when the trial was found in more than one DISTINCT registry. CORRECTED 2026-08-25: this previously counted registry entries, so it read true for a trial whose two merged records were both from ISRCTN. It is now identical to cross_registry.

Type:boolean | null

Example:

true

Primary URL

primary_url

Optional

Link to the trial on its primary registry.

Type:string | null

Linked patents

linked_patents

Optional

Related US patents matched on interventions (when patent enrichment is enabled).

Type:object[]

Linked patent count

linked_patent_count

Optional

Number of related patents linked to this trial.

Type:number | null

Example:

Distinct registries

distinct_registries

Optional

Each DISTINCT registry this trial was found in, listed once and sorted. Use this, not source_count, to judge cross-registry coverage.

Type:string[]

Distinct registry count

distinct_registry_count

Optional

Number of DISTINCT registries this trial appears in. Differs from source_count when two records from the SAME registry merged on a shared identifier.

Type:number | null

Cross-registry

cross_registry

Optional

True only when the trial was found in two or more DISTINCT registries. This is the meta-search value-add.

Type:boolean | null

Registry entry count

registry_entry_count

Optional

Number of registry records merged into this row, counting two records from the same registry as two. Identical to source_count; named explicitly so the distinction from distinct_registry_count is unambiguous.

Type:number | null

Registry status code

registry_status_code

Optional

The registry-native numeric status code where the registry publishes one (EU CTIS ctStatus 1-11). Null for registries that publish status as text.

Type:number | null

Status decode provenance

status_decode

Optional

How the status field was produced: native_text (the registry published text), decoded_coarse (a numeric code decoded against a measured lookup), unmapped_code (an unrecognised code, so status is null and was NOT guessed), or absent.

Type:string | null

Row source bucket

row_source_bucket

Optional

Which allocation bucket this row was granted from: cross_registry, a registry name, or unattributed. Shows how the maxResults budget was shared.

Type:string | null

Registries requested

sources_requested

Optional

The registries this run was asked to search.

Type:string[]

Registries that answered

sources_ok

Optional

Registries that answered and were parsed. A zero record count from one of these IS a verified negative.

Type:string[]

Registries that failed

sources_failed

Optional

Registries that were asked and could not answer. Their absence from the results means nothing - it is not evidence that no trial matched.

Type:string[]

Run degraded

sources_degraded

Optional

True when at least one requested registry failed, so this result set is incomplete for reasons unrelated to your query.

Type:boolean | null

Per-registry status

source_status

Optional

Per-registry outcome: ok (answered), failed (asked, could not answer), or not_requested.

Type:object | null

Per-registry record counts

source_record_counts

Optional

Records contributed per registry. A failed or not-requested registry reports null, NEVER 0, because zero is a factual claim that we looked.

Type:object | null

Per-registry diagnostics

source_diagnostics

Optional

Per registry: status, records returned, records the registry says match in total, whether we truncated, and the error text if it failed.

Type:object[]

Raw records fetched

raw_records_fetched

Optional

Total records received from all registries before merging.

Type:number | null

Unified rows available

unified_rows_available

Optional

Unified trials produced by merging, BEFORE the maxResults cap. Compare with the row count you received to see how much was truncated.

Type:number | null

Records merged

records_merged

Optional

The TRUE merge count: raw records absorbed into an existing unified row. Computed before the cap, so it never mixes merging with truncation.

Type:number | null

Cross-registry rows

cross_registry_rows

Optional

Unified rows spanning two or more DISTINCT registries.

Type:number | null

Same-registry merge rows

same_registry_merge_rows

Optional

Unified rows that merged two or more records from the SAME registry, typically on a shared EudraCT number. These are not cross-registry findings.

Type:number | null

Rows dropped by cap

rows_dropped_by_cap

Optional

Unified trials that existed but were not written because maxResults was reached.

Type:number | null

Results truncated

results_truncated

Optional

True when rows_dropped_by_cap is greater than zero.

Type:boolean | null

Max results

max_results

Optional

The maxResults cap this run applied. It bounds both the rows written and the amount billed.

Type:number | null

Patent enrichment status

patent_enrichment_status

Optional

What the patent leg did: not_requested, no_api_key, ok, partial, failed, or no_interventions_to_match. When no lookup ran, linked_patent_count is null rather than 0.

Type:string | null

EU CTIS decode canary

ctis_decode_canary_status

Optional

Outcome of the live check that EU CTIS's numeric status codes still decode to the statuses the registry itself publishes: pass (at least one code+text pair verified, no drift measured), fail (drift measured - the run is failed and nothing is billed), unavailable (CTIS could not be probed, so the EU leg is reported as failed rather than as a result), or not_checked (euctis was not requested).

Type:string | null

Decode canary probes passed

ctis_decode_canary_probes_passed

Optional

How many pinned EU CTIS trials had their code+text pair verified against our table this run. Null when euctis was not requested.

Type:number | null

Decode canary probes failed

ctis_decode_canary_probes_failed

Optional

How many pinned EU CTIS trials measurably disagreed with our status table. Any value above zero fails the run before a row is written.

Type:number | null

Decode canary probes unavailable

ctis_decode_canary_probes_unavailable

Optional

How many pinned EU CTIS probes could not be completed (registry unreachable, payload incomplete, or the search filter could not be proven to have applied). An unavailable probe is an availability problem, never counted as a pass.

Type:number | null

Decode canary codes verified

ctis_decode_canary_codes_verified

Optional

The EU CTIS status codes actually verified this run, computed from the codes observed rather than from what was expected. A short list means thin coverage, not a failure.

Type:number[] | null

Decode canary codes NOT verified

ctis_decode_canary_codes_unverified

Optional

Status codes present in our table that no probe exercised this run. Codes 1 (Under evaluation), 6 (Halted) and 7 (Suspended) are normally here by design: they are transient states, so a trial pinned in one stops covering its own code within months.

Type:number[] | null

Decode canary measurements

ctis_decode_canary_measured

Optional

One entry per pinned trial: the code the search endpoint published, the code and status text the retrieve endpoint published, the label our table gives that code, whether the search filter was proven to have applied, and the outcome with its reason.

Type:object[] | null

Decode canary coverage note

ctis_decode_canary_note

Optional

The canary's own honesty boundary, stated on every row: codes 2, 3, 4 and 5 all decode to the single label "Authorised" and EMA publishes no finer public status text, so a renumbering confined to those four codes is NOT detectable and is not covered by a pass.

Type:string | null

EU Clinical Trials (CTIS) Scraper

crawlerbros/eu-ctis-scraper

Scrape the EU Clinical Trials Information System (CTIS) - the EMA's official register of clinical trials across the EU/EEA. Search by title, condition, sponsor, status, phase, therapeutic area, country, and more, or look up full trial detail by EU CT number. Public REST API - no auth, no proxy.

Crawler Bros

EU Clinical Trials EMA CTIS Scraper

parseforge/euctr-ema-trials-scraper

Scrapes EU clinical trials from the EMA CTIS register by search term, status, or phase. Returns each trial as a flat row with title, sponsor, condition, status, and phase.

ParseForge

5.0

EU Clinical Trials (CTIS) - Trial Registry, Per Trial

nexgensignal/eu-clinical-trial-ctis-records

EU CTIS (EMA) clinical trials as clean per-trial records - EU CT number, title, status, sponsor org, phase, member states, condition and decision date. Registry metadata only; no contacts or narrative. $0.05 per record.

NexGen Signal

WHO ICTRP Clinical Trials Scraper

crawlerbros/who-ictrp-clinical-trials-scraper

Scrape the WHO ICTRP clinical trials search portal, aggregating 22+ national registries (ClinicalTrials.gov, EU-CTR/CTIS, ISRCTN, ChiCTR, ANZCTR, CTRI and more). Search by condition, intervention, sponsor, status or trial ID; get full trial metadata.

Crawler Bros

Clinical Trials Tracker — ClinicalTrials.gov API

nexgendata/clinical-trials-tracker

NexGenData

Clinical Trials Search (ClinicalTrials.gov)

agentictools/clinical-trials-search

Search and monitor clinical trials from ClinicalTrials.gov by condition, term, sponsor, or status. Phases, enrollment, sponsors, locations, and dates.

Ken Agland

Clinical Trials Scraper

seemuapps/clinicaltrials-scraper

Search and extract clinical trials by condition, drug, sponsor, or location, status, phase, eligibility, enrollment, and sites from ClinicalTrials.gov.

Andrew

Clinical Trials Search — ClinicalTrials.gov API

scrupulous_waterbird_m4w/clinical-trials-gov

Clinical trials search over the public ClinicalTrials.gov v2 API. Filter by condition, drug, sponsor, phase, status, and location. Returns NCT IDs, phases, sponsors, locations, and summaries.

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Clinical Trials Monitor - ClinicalTrials.gov to JSON

aaddss/clinical-trials-monitor

Search and monitor ClinicalTrials.gov via the official API. Filter by condition, sponsor, or status and get clean, flattened, no-code-ready records.

lxraa

EU Clinical Trials Register Scraper

parseforge/eu-clinical-trials-register-scraper

Scrapes clinical trial records from the EU Clinical Trials Register by keyword and status. Returns each trial as a flat row with title, sponsor, conditions, and phases.

ParseForge