MCP server

ClinicalTrials.gov MCP by usefulapi

io.usefulapi/clinicaltrialsgov

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Website Source

At a glance

Type

MCP server

Publisher

usefulapi.io (verified by the MCP Registry)

Status

Working at last check

Tools

7

Token cost

About 2,325 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http clinicaltrialsgov https://clinicaltrialsgov.usefulapi.io/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.clinicaltrialsgov]
url = "https://clinicaltrialsgov.usefulapi.io/mcp"

Gemini CLI

{"mcpServers":{"clinicaltrialsgov":{"httpUrl":"https://clinicaltrialsgov.usefulapi.io/mcp"}}}

Cursor

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

VS Code

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

Antigravity

agy mcp add clinicaltrialsgov https://clinicaltrialsgov.usefulapi.io/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"clinicaltrialsgov","server_url":"https://clinicaltrialsgov.usefulapi.io/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"clinicaltrialsgov","server_url":"https://clinicaltrialsgov.usefulapi.io/mcp"}

Tools

• clinicaltrialsgov_count_studies ~578 tokens
  Return only the total NUMBER of studies matching a query, without fetching any records. Accepts the same query terms and filters as clinicaltrialsgov_search_studies (term, condition, intervention, title, location, sponsor, status, geoFilter, advanced). Returns { totalCount }. GET /studies with count
• clinicaltrialsgov_get_api_version ~87 tokens
  Return the ClinicalTrials.gov API version and the timestamp of the underlying data snapshot: { apiVersion, dataTimestamp }. GET /version.
• clinicaltrialsgov_get_studies_stats ~102 tokens
  Return overall study-size statistics across the registry: { totalStudies, averageSizeBytes, percentiles, ranges, largestStudies }. Useful for understanding data volume. GET /stats/size.
• clinicaltrialsgov_get_study ~227 tokens
  Fetch a single ClinicalTrials.gov study by its NCT id (format NCT######## — the letters 'NCT' followed by digits, e.g. NCT00841061). Returns the full study object { protocolSection, derivedSection?, hasResults? }. Use `fields` to return only specific fields/modules. GET /studies/{nctId}.
• clinicaltrialsgov_get_study_metadata ~196 tokens
  Return the ClinicalTrials.gov study data model as a tree of module nodes (each with name/title/type/children). Use this to explore what fields/modules exist and their nesting, to build `fields` selections or `sort`/filter expressions. GET /studies/metadata.
• clinicaltrialsgov_list_field_values ~245 tokens
  Discover valid values / enums for one or more study fields. Returns per-field value statistics — for each field: its type, unique-value count and topValues [{value, studiesCount}]. Great for finding valid enum values (e.g. OverallStatus, Phase) before building a filter. GET /stats/field/values.
• clinicaltrialsgov_search_studies ~890 tokens
  Search the ClinicalTrials.gov v2 study registry. Provide any combination of query terms (condition, intervention, title, location, sponsor, general term) — multiple query.* terms are ANDed together — plus optional filters (status, geo, advanced Essie expression, explicit NCT ids). Returns { totalCou

Browse

• Government and public data

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