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ClinicalTrials.gov API - Clinical Study Data

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ClinicalTrials.gov API - Clinical Study Data & Trial Registry Access ClinicalTrials.gov data for clinical studies worldwide. Search trials by condition, intervention, sponsor, phase, or location. Track drug development pipelines and find recruiting studies.

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from $0.01 / 1,000 results

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The Howlers

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ClinicalTrials.gov API - Clinical Study Data & Trial Registry

Access ClinicalTrials.gov data for clinical studies worldwide. Search trials by condition, intervention, sponsor, phase, or location. Get detailed protocol information, eligibility criteria, and study results.

Note: Demo Mode is off by default, so runs fetch real data. Set demoMode to true to get free sample data instead.

Quick Start

Test with Demo Mode (free, no API key needed)

{
  "demoMode": true
}

Run with real data

{
  "demoMode": false,
  "task": "search_studies",
  "limit": 100
}

Input Parameters

Parameter	Type	Default	Required	Description
`task`	string	`"search_studies"`	Yes*	The operation to perform
`searchQuery`	string	-	No	Keywords to search in study titles and descriptions
`nctId`	string	-	No	ClinicalTrials.gov identifier (e.g., NCT05678901)
`condition`	string	-	No	Medical condition or disease to search
`sponsor`	string	-	No	Study sponsor organization name
`intervention`	string	-	No	Drug, device, or procedure name
`location`	string	-	No	City, state, or country for study sites
`phase`	string	-	No	Clinical trial phase
`status`	string	-	No	Study recruitment status
`studyType`	string	-	No	Type of clinical study
`limit`	integer	`100`	No	Maximum number of results to return
`webhookUrl`	string	-	No	URL to receive results via webhook
`demoMode`	boolean	`false`	No	Run with sample data (no API required)

Pricing

This actor uses pay-per-event billing:

Event	When it is charged	Price
Actor start	Once when the run starts, one event per GB of memory (minimum one). At the default 4 GB of memory a run starts at $0.40	$0.10 per GB
Search Clinical Studies	Full-text search across all clinical trials. Filter by condition, phase, status, and study type	$0.01
Get Study Details	Retrieve complete study protocol by NCT ID. Includes eligibility, interventions, outcomes, and contacts	$0.01
Search by Condition	Find clinical trials for a specific disease or medical condition. Track therapeutic development activity	$0.01
Search by Sponsor	Find trials sponsored by a specific organization. Monitor pharma/biotech company pipelines	$0.01
Search by Intervention	Search trials testing a specific drug, device, or procedure. Track competitive landscape for therapeutics	$0.01
Search by Location	Find clinical trials at specific sites or geographic regions. Identify local recruitment opportunities	$0.01
Get Study Results	Retrieve published results and outcomes for completed trials. Access efficacy and safety data	$0.01
Search Recruiting Trials	Find actively recruiting clinical trials. Identify patient enrollment opportunities	$0.01
Result	Each item written to the default dataset	$0.00001

Demo mode is free -- no charges for sample data.

Troubleshooting

"API error 429" or "Rate limit"

Too many requests. Wait a minute and try again, or reduce the number of items per run.

No results or empty dataset

Check the run log for error messages. Common causes:

Invalid input format (check the examples above)
The target data doesn't exist or is too small to track

How do I test without an API key?

Enable Demo Mode in the input. This returns realistic sample data so you can verify the output format works for your workflow.

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