---
name: "xpay-clinical-trials"
description: "Search and analyze clinical trials from ClinicalTrials.gov"
version: "1.0.0"
provider: "Clinical Trials"
tools: 12
---

# Clinical Trials

Search and analyze clinical trials from ClinicalTrials.gov

## Clinical Trials

Search and analyze clinical trials from ClinicalTrials.gov

### Available Tools (12)

- **search_trials_by_condition**: Search clinical trials by medical condition(s).

This tool allows you to search for clinical trials based on a list of medical conditions.

Input:
  - `conditions`: A list of strings, where each string is a medical condition to search for.
                  The search will find trials related to any of the specified conditions.
                  Example: `['cancer', 'diabetes']`
  - `max_studies`: The maximum number of studies to return. Defaults to 50.
  - `fields`: A list of specific fields to return in the results. If not provided, returns
              SEARCH_TOOL_DEFAULTS (9 essential fields: NCTId, BriefTitle, Acronym, Condition,
              Phase, InterventionName, LeadSponsorName, OverallStatus, HasResults). — $0.01/call
- **search_trials_by_intervention**: Search clinical trials by intervention/treatment.

This tool allows you to search for clinical trials based on a list of interventions or treatments.

Input:
  - `interventions`: A list of strings, where each string is an intervention or treatment to search for.
                     The search will find trials related to any of the specified interventions.
                     Example: `['aspirin', 'chemotherapy']`
  - `max_studies`: The maximum number of studies to return. Defaults to 50.
  - `fields`: A list of specific fields to return in the results. If not provided, returns
              SEARCH_TOOL_DEFAULTS (9 essential fields: NCTId, BriefTitle, Acronym, Condition,
              Phase, InterventionName, LeadSponsorName, OverallStatus, HasResults). — $0.01/call
- **search_trials_by_sponsor**: Search clinical trials by sponsor/organization.

This tool allows you to search for clinical trials based on a list of sponsor organizations.

Input:
  - `sponsors`: A list of strings, where each string is a sponsor organization to search for.
                The search will find trials sponsored by any of the specified organizations.
                Example: `['National Cancer Institute', 'Pfizer']`
  - `max_studies`: The maximum number of studies to return. Defaults to 50.
  - `fields`: A list of specific fields to return in the results. If not provided, returns
              SEARCH_TOOL_DEFAULTS (9 essential fields: NCTId, BriefTitle, Acronym, Condition,
              Phase, InterventionName, LeadSponsorName, OverallStatus, HasResults). — $0.01/call
- **search_trials_by_acronym**: Search clinical trials by study acronym.

Uses the Acronym field (protocolSection.identificationModule.acronym) to find
trials by their public short name. Example: 'TETON'. The API search is seeded
with the provided acronyms to narrow results, then results are filtered locally
to ensure the acronym field matches the requested value(s).

Input:
  - `acronyms`: One or more acronyms to search for (e.g., ['TETON']).
  - `max_studies`: Maximum number of studies to request from the API.
  - `exact_match`: When true (default), matches acronyms exactly (case-insensitive).
                   When false, matches if any provided acronym is contained within
                   the study acronym (case-insensitive partial match).
  - `fields`: A list of specific fields to return in the results. If not provided, returns
              ACRONYM_SEARCH_DEFAULTS (8 fields optimized for acronym discovery: NCTId,
              BriefTitle, Acronym, Condition, InterventionName, Phase, LeadSponsorName, HasResults). — $0.01/call
- **search_trials_by_nct_ids**: Retrieve specific clinical trials by NCT ID(s).

This tool allows you to retrieve the details of specific clinical trials by providing their NCT IDs.

Input:
  - `nct_ids`: A list of strings, where each string is an NCT ID to retrieve.
               Example: `['NCT04280705', 'NCT04280718']`
  - `fields`: A list of specific fields to return in the results. If not provided, returns
              SEARCH_TOOL_DEFAULTS (9 essential fields: NCTId, BriefTitle, Acronym, Condition,
              Phase, InterventionName, LeadSponsorName, OverallStatus, HasResults). — $0.01/call
- **search_trials_combined**: Search clinical trials using multiple criteria.

This tool allows you to perform a combined search using multiple criteria such as conditions, interventions, sponsors, and general terms.

Input:
  - `conditions`: A list of medical conditions to search for.
  - `interventions`: A list of interventions or treatments to search for.
  - `sponsors`: A list of sponsor organizations to search for.
  - `terms`: A list of general search terms.
  - `nct_ids`: A list of specific NCT IDs to include in the search.
  - `max_studies`: The maximum number of studies to return. Defaults to 50.
  - `fields`: A list of specific fields to return in the results. If not provided, returns
              SEARCH_TOOL_DEFAULTS (9 essential fields: NCTId, BriefTitle, Acronym, Condition,
              Phase, InterventionName, LeadSponsorName, OverallStatus, HasResults). — $0.01/call
- **get_trial_details**: Get comprehensive details for a single clinical trial.

This tool retrieves detailed information for a single clinical trial given its NCT ID.

Input:
  - `nct_id`: The NCT ID of the trial to retrieve.
              Example: `'NCT04280705'`
  - `fields`: A list of specific fields to return. If not provided, returns DETAIL_TOOL_DEFAULTS
              (25 comprehensive fields covering: NCTId, BriefTitle, OfficialTitle, Acronym, Condition,
              Keyword, Phase, OverallStatus, InterventionType, InterventionName, InterventionDescription,
              ArmGroupLabel, ArmGroupType, ArmGroupDescription, EligibilityCriteria, MinimumAge, MaximumAge,
              Sex, PrimaryOutcomeMeasure, SecondaryOutcomeMeasure, BriefSummary, LocationFacility,
              LocationCountry, LeadSponsorName, CollaboratorName, HasResults). — $0.01/call
- **get_trial_details_batched**: Retrieve detailed clinical trial records in batches to reduce payload during discovery.

Accepts a list of NCT IDs and fetches details in batches (default 10).
Preserves the order of input NCT IDs in the returned list.
Use this after search tools which return a minimal field set.

Input:
  - `nct_ids`: List of NCT IDs to retrieve in batches.
  - `fields`: Specific fields to return. If not provided, returns DETAIL_TOOL_DEFAULTS
              (25 comprehensive fields covering: NCTId, BriefTitle, OfficialTitle, Acronym, Condition,
              Keyword, Phase, OverallStatus, InterventionType, InterventionName, InterventionDescription,
              ArmGroupLabel, ArmGroupType, ArmGroupDescription, EligibilityCriteria, MinimumAge, MaximumAge,
              Sex, PrimaryOutcomeMeasure, SecondaryOutcomeMeasure, BriefSummary, LocationFacility,
              LocationCountry, LeadSponsorName, CollaboratorName, HasResults).
  - `batch_size`: Number of trials to fetch per API call (default 10). — $0.01/call
- **analyze_trial_phases**: Analyze the distribution of trial phases for given search criteria.

This tool analyzes the distribution of clinical trial phases (e.g., Phase 1, Phase 2, Phase 3) 
for a given set of search criteria.

Input:
  - `conditions`: A list of medical conditions to filter the analysis.
  - `interventions`: A list of interventions to filter the analysis.
  - `sponsors`: A list of sponsors to filter the analysis.
  - `max_studies`: The maximum number of studies to include in the analysis. Defaults to 1000. — $0.01/call
- **get_field_statistics**: Get statistical information about field values.

This tool retrieves statistical information about the values of specified fields in the ClinicalTrials.gov database.

Input:
  - `field_names`: A list of field names to get statistics for.
  - `field_types`: A list of field types to filter by.
                   Example: `['ENUM', 'STRING']` — $0.01/call
- **get_available_fields**: Get organized list of available fields for customizing search results.

This tool provides a list of available fields that can be used to customize the results of other search tools.
The fields are organized into categories.

Input:
  - `category`: An optional string to specify a category of fields to return.
                If not provided, all categories and default fields will be returned.
                Example: `'conditions'` — $0.01/call
- **search_trials_nct_ids_only**: Lightweight search returning only NCT IDs and minimal metadata for discovery.

This tool performs a lightweight search that returns only the NCT IDs and minimal metadata 
for the purpose of discovering relevant trials.

Input:
  - `conditions`: A list of medical conditions to search for.
  - `interventions`: A list of interventions or treatments to search for.
  - `sponsors`: A list of sponsor organizations to search for.
  - `terms`: A list of general search terms.
  - `max_studies`: The maximum number of studies to return. Defaults to 100. — $0.01/call

### Quick Start

```json
{
  "mcpServers": {
    "clinical-trials": {
      "url": "https://clinical-trials.mcp.xpay.sh/mcp?key=YOUR_XPAY_KEY"
    }
  }
}
```

### Pricing

$0.01 per tool call. Pay per use from your XPay wallet. No subscriptions.

Get an API key at [xpay.tools](https://xpay.tools).


**Tools:** 12
**Category:** Academic & Research

## When to Use

Use Clinical Trials tools when you need to search and analyze clinical trials from clinicaltrials.gov. All tools are available through xpay✦'s single MCP connection.

## MCP Connection

```json
{
  "mcpServers": {
    "xpay": {
      "url": "https://mcp.xpay.sh/mcp?key=YOUR_API_KEY"
    }
  }
}
```

For Claude Code:
```bash
claude mcp add --transport http xpay "https://mcp.xpay.sh/mcp?key=YOUR_API_KEY"
```

## Available Tools

- **Search Trials By Condition** — Search clinical trials by medical condition(s).

This tool allows you to search for clinical trials based on a list of medical conditions.

Input:
  - `conditions`: A list of strings, where each string is a medical condition to search for.
                  The search will find trials related to any of the specified conditions.
                  Example: `['cancer', 'diabetes']`
  - `max_studies`: The maximum number of studies to return. Defaults to 50.
  - `fields`: A list of specific fields to return in the results. If not provided, returns
              SEARCH_TOOL_DEFAULTS (9 essential fields: NCTId, BriefTitle, Acronym, Condition,
              Phase, InterventionName, LeadSponsorName, OverallStatus, HasResults). — $0.01/call — [SKILL.md](https://xpay.tools/skills/clinical-trials/search-trials-by-condition/SKILL.md)
- **Search Trials By Intervention** — Search clinical trials by intervention/treatment.

This tool allows you to search for clinical trials based on a list of interventions or treatments.

Input:
  - `interventions`: A list of strings, where each string is an intervention or treatment to search for.
                     The search will find trials related to any of the specified interventions.
                     Example: `['aspirin', 'chemotherapy']`
  - `max_studies`: The maximum number of studies to return. Defaults to 50.
  - `fields`: A list of specific fields to return in the results. If not provided, returns
              SEARCH_TOOL_DEFAULTS (9 essential fields: NCTId, BriefTitle, Acronym, Condition,
              Phase, InterventionName, LeadSponsorName, OverallStatus, HasResults). — $0.01/call — [SKILL.md](https://xpay.tools/skills/clinical-trials/search-trials-by-intervention/SKILL.md)
- **Search Trials By Sponsor** — Search clinical trials by sponsor/organization.

This tool allows you to search for clinical trials based on a list of sponsor organizations.

Input:
  - `sponsors`: A list of strings, where each string is a sponsor organization to search for.
                The search will find trials sponsored by any of the specified organizations.
                Example: `['National Cancer Institute', 'Pfizer']`
  - `max_studies`: The maximum number of studies to return. Defaults to 50.
  - `fields`: A list of specific fields to return in the results. If not provided, returns
              SEARCH_TOOL_DEFAULTS (9 essential fields: NCTId, BriefTitle, Acronym, Condition,
              Phase, InterventionName, LeadSponsorName, OverallStatus, HasResults). — $0.01/call — [SKILL.md](https://xpay.tools/skills/clinical-trials/search-trials-by-sponsor/SKILL.md)
- **Search Trials By Acronym** — Search clinical trials by study acronym.

Uses the Acronym field (protocolSection.identificationModule.acronym) to find
trials by their public short name. Example: 'TETON'. The API search is seeded
with the provided acronyms to narrow results, then results are filtered locally
to ensure the acronym field matches the requested value(s).

Input:
  - `acronyms`: One or more acronyms to search for (e.g., ['TETON']).
  - `max_studies`: Maximum number of studies to request from the API.
  - `exact_match`: When true (default), matches acronyms exactly (case-insensitive).
                   When false, matches if any provided acronym is contained within
                   the study acronym (case-insensitive partial match).
  - `fields`: A list of specific fields to return in the results. If not provided, returns
              ACRONYM_SEARCH_DEFAULTS (8 fields optimized for acronym discovery: NCTId,
              BriefTitle, Acronym, Condition, InterventionName, Phase, LeadSponsorName, HasResults). — $0.01/call — [SKILL.md](https://xpay.tools/skills/clinical-trials/search-trials-by-acronym/SKILL.md)
- **Search Trials By Nct Ids** — Retrieve specific clinical trials by NCT ID(s).

This tool allows you to retrieve the details of specific clinical trials by providing their NCT IDs.

Input:
  - `nct_ids`: A list of strings, where each string is an NCT ID to retrieve.
               Example: `['NCT04280705', 'NCT04280718']`
  - `fields`: A list of specific fields to return in the results. If not provided, returns
              SEARCH_TOOL_DEFAULTS (9 essential fields: NCTId, BriefTitle, Acronym, Condition,
              Phase, InterventionName, LeadSponsorName, OverallStatus, HasResults). — $0.01/call — [SKILL.md](https://xpay.tools/skills/clinical-trials/search-trials-by-nct-ids/SKILL.md)
- **Search Trials Combined** — Search clinical trials using multiple criteria.

This tool allows you to perform a combined search using multiple criteria such as conditions, interventions, sponsors, and general terms.

Input:
  - `conditions`: A list of medical conditions to search for.
  - `interventions`: A list of interventions or treatments to search for.
  - `sponsors`: A list of sponsor organizations to search for.
  - `terms`: A list of general search terms.
  - `nct_ids`: A list of specific NCT IDs to include in the search.
  - `max_studies`: The maximum number of studies to return. Defaults to 50.
  - `fields`: A list of specific fields to return in the results. If not provided, returns
              SEARCH_TOOL_DEFAULTS (9 essential fields: NCTId, BriefTitle, Acronym, Condition,
              Phase, InterventionName, LeadSponsorName, OverallStatus, HasResults). — $0.01/call — [SKILL.md](https://xpay.tools/skills/clinical-trials/search-trials-combined/SKILL.md)
- **Get Trial Details** — Get comprehensive details for a single clinical trial.

This tool retrieves detailed information for a single clinical trial given its NCT ID.

Input:
  - `nct_id`: The NCT ID of the trial to retrieve.
              Example: `'NCT04280705'`
  - `fields`: A list of specific fields to return. If not provided, returns DETAIL_TOOL_DEFAULTS
              (25 comprehensive fields covering: NCTId, BriefTitle, OfficialTitle, Acronym, Condition,
              Keyword, Phase, OverallStatus, InterventionType, InterventionName, InterventionDescription,
              ArmGroupLabel, ArmGroupType, ArmGroupDescription, EligibilityCriteria, MinimumAge, MaximumAge,
              Sex, PrimaryOutcomeMeasure, SecondaryOutcomeMeasure, BriefSummary, LocationFacility,
              LocationCountry, LeadSponsorName, CollaboratorName, HasResults). — $0.01/call — [SKILL.md](https://xpay.tools/skills/clinical-trials/get-trial-details/SKILL.md)
- **Get Trial Details Batched** — Retrieve detailed clinical trial records in batches to reduce payload during discovery.

Accepts a list of NCT IDs and fetches details in batches (default 10).
Preserves the order of input NCT IDs in the returned list.
Use this after search tools which return a minimal field set.

Input:
  - `nct_ids`: List of NCT IDs to retrieve in batches.
  - `fields`: Specific fields to return. If not provided, returns DETAIL_TOOL_DEFAULTS
              (25 comprehensive fields covering: NCTId, BriefTitle, OfficialTitle, Acronym, Condition,
              Keyword, Phase, OverallStatus, InterventionType, InterventionName, InterventionDescription,
              ArmGroupLabel, ArmGroupType, ArmGroupDescription, EligibilityCriteria, MinimumAge, MaximumAge,
              Sex, PrimaryOutcomeMeasure, SecondaryOutcomeMeasure, BriefSummary, LocationFacility,
              LocationCountry, LeadSponsorName, CollaboratorName, HasResults).
  - `batch_size`: Number of trials to fetch per API call (default 10). — $0.01/call — [SKILL.md](https://xpay.tools/skills/clinical-trials/get-trial-details-batched/SKILL.md)
- **Analyze Trial Phases** — Analyze the distribution of trial phases for given search criteria.

This tool analyzes the distribution of clinical trial phases (e.g., Phase 1, Phase 2, Phase 3) 
for a given set of search criteria.

Input:
  - `conditions`: A list of medical conditions to filter the analysis.
  - `interventions`: A list of interventions to filter the analysis.
  - `sponsors`: A list of sponsors to filter the analysis.
  - `max_studies`: The maximum number of studies to include in the analysis. Defaults to 1000. — $0.01/call — [SKILL.md](https://xpay.tools/skills/clinical-trials/analyze-trial-phases/SKILL.md)
- **Get Field Statistics** — Get statistical information about field values.

This tool retrieves statistical information about the values of specified fields in the ClinicalTrials.gov database.

Input:
  - `field_names`: A list of field names to get statistics for.
  - `field_types`: A list of field types to filter by.
                   Example: `['ENUM', 'STRING']` — $0.01/call — [SKILL.md](https://xpay.tools/skills/clinical-trials/get-field-statistics/SKILL.md)
- **Get Available Fields** — Get organized list of available fields for customizing search results.

This tool provides a list of available fields that can be used to customize the results of other search tools.
The fields are organized into categories.

Input:
  - `category`: An optional string to specify a category of fields to return.
                If not provided, all categories and default fields will be returned.
                Example: `'conditions'` — $0.01/call — [SKILL.md](https://xpay.tools/skills/clinical-trials/get-available-fields/SKILL.md)
- **Search Trials Nct Ids Only** — Lightweight search returning only NCT IDs and minimal metadata for discovery.

This tool performs a lightweight search that returns only the NCT IDs and minimal metadata 
for the purpose of discovering relevant trials.

Input:
  - `conditions`: A list of medical conditions to search for.
  - `interventions`: A list of interventions or treatments to search for.
  - `sponsors`: A list of sponsor organizations to search for.
  - `terms`: A list of general search terms.
  - `max_studies`: The maximum number of studies to return. Defaults to 100. — $0.01/call — [SKILL.md](https://xpay.tools/skills/clinical-trials/search-trials-nct-ids-only/SKILL.md)

## How to Execute

1. **`xpay_discover`** — Search for tools: `xpay_discover("clinical-trials")`
2. **`xpay_details`** — Get input schema: `xpay_details("clinical-trials/TOOL_NAME")`
3. **`xpay_run`** — Execute: `xpay_run("clinical-trials/TOOL_NAME", { ...inputs })`
4. **`xpay_balance`** — Check credits

## Links

- Provider page: https://xpay.tools/clinical-trials/
- All providers: https://xpay.tools/explore
- Docs: https://docs.xpay.sh