Clinicaltrialsgov

io.usefulapiv1.0.0Updated Sep 29, 2026

Search and read ClinicalTrials.gov studies, sites and outcomes.

VerifiedStreamable HTTPWeb executableData & Analytics Knowledge & Memory

Overview

AI-generated overview

Lets an assistant search and read ClinicalTrials.gov clinical trial studies, sites, and outcome data through a hosted endpoint.

What it does: Provides read-only tools over the public ClinicalTrials.gov data: search_studies finds trials, get_study retrieves one by NCT ID, count_studies counts matches, and list_field_values returns value statistics for study fields. It also exposes get_study_metadata for the study data model, get_studies_stats for size statistics, and get_api_version for the underlying API version.
When to use it: Useful when an assistant needs to look up clinical trial records, check whether a trial exists, or gather counts and field statistics for research or reporting. It is a hosted service, so it suits users who want trial data without running a local process.
Requirements: A remote MCP endpoint at no local install, packages, credentials, or environment variables are declared. Network access is required, and on first connect the user approves the link, after which usage is metered to a private id.

Before you install

The README states the server needs no credential because ClinicalTrials.gov is public data, but usage is metered to a private id and the free plan is limited to 100 tool calls per month, with a paid Pro plan for unlimited use. All listed tools are read-only, so no data is written or deleted.

Installation

In SourceWeft

Open Clinicaltrialsgov in the dashboard and add it to a workspace.
Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "clinicaltrialsgov": {
      "type": "http",
      "url": "https://clinicaltrialsgov.usefulapi.io/mcp"
    }
  }
}

README