# ClinicalTrials.gov API: Get clinical trial by NCT number or title > Returns the full public record of a ClinicalTrials.gov study, looked up by NCT number or by title (closest registered title for ambiguous titles). Unofficial. Not affiliated with or endorsed by ClinicalTrials.gov. - Page: https://fous.com/methods/clinicaltrials.gov/get-trial - Method: `clinicaltrials.gov/get_trial`, version 1 - Website: clinicaltrials.gov - Returns: title, official title, purpose, status, phase, sponsor, dates, eligibility, arms, treatments, outcomes, locations, contacts - Effect: read (it gets data and changes nothing) - Sign-in: none needed - Cost: 1 credit per completed run (1¢ with pay as you go); failed runs are free - Verified: Nov 2, 2026 ## Inputs | Field | Type | Required | In the run below | Description | |---|---|---|---|---| | `trial` | string | yes | `"NCT04368728"` | The trial title or NCT trial number, for example NCT04368728. | ## Output From a run on Oct 23, 2026, shortened. Its input: ```json { "trial": "NCT04368728" } ``` Its output: ```json { "arms": [ { "name": "10 µg dose, 18-55 years of age (2 doses)", "type": "Experimental", "treatments": [ "Biological: BNT162b1", "Biological: BNT162b2" ], "description": null }, { "name": "20 µg dose, 18-55 years of age (2 doses)", "type": "Experimental", "treatments": [ "Biological: BNT162b1", "Biological: BNT162b2" ], "description": null }, { "name": "30 µg dose, 18-55 years of age (2 doses)", "type": "Experimental", "treatments": [ "Biological: BNT162b1", "Biological: BNT162b2" ], "description": null } ], "phase": "Phase 2 / Phase 3", "title": "Study to Describe the Safety, Tolerability, Immunogenicity, and Efficacy of RNA Vaccine Candidates Against COVID-19 in Healthy Individuals", "status": "Completed", "sponsor": "BioNTech SE", "age_range": "12 Years and older", "locations": [ { "city": "Athens", "country": "United States", "facility": "North Alabama Research Center, LLC", "recruitment_status": null }, { "city": "Birmingham", "country": "United States", "facility": "Birmingham Clinical Research Unit", "recruitment_status": null }, { "city": "Huntsville", "country": "United States", "facility": "Medical Affiliated Research Center", "recruitment_status": null } ], "start_date": "2020-04-29", "treatments": [ { "arms": [ "10 µg dose, 18-55 years of age (2 doses)", "10 µg dose, 65-85 years of age (2 doses)", "100 µg dose, 18-55 years of age (2 doses)" ], "name": "BNT162b1", "type": "Biological", "description": "Intramuscular injection" }, { "arms": [ "10 µg dose, 18-55 years of age (2 doses)", "10 µg dose, 65-85 years of age (2 doses)", "20 µg dose, 18-55 years of age (2 doses)" ], "name": "BNT162b2", "type": "Biological", "description": "Intramuscular injection" }, { "arms": [ "Placebo, 18-55 years of age", "Placebo, 65-85 years of age", "Placebo, ≥12 years of age" ], "name": "Placebo", "type": "Other", "description": "Intramuscular injection" } ], "trial_link": "https://clinicaltrials.gov/study/NCT04368728", "trial_number": "NCT04368728", "official_title": "A PHASE 1/2/3, PLACEBO-CONTROLLED, RANDOMIZED, OBSERVER-BLIND, DOSE-FINDING STUDY TO EVALUATE THE SAFETY, TOLERABILITY, IMMUNOGENICITY, AND EFFICACY OF SARS-COV-2 RNA VACCINE CANDIDATES AGAINST COVID-19 IN HEALTHY INDIVIDUALS", "results_posted": true, "completion_date": "2023-02-10", "public_contacts": [], "purpose_summary": "This is a Phase 1/2/3, randomized, placebo-controlled, observer-blind, dose-finding, vaccine candidate-selection, and efficacy study in healthy individuals.\n\nThe study consists of 2 parts: Phase 1: to identify preferred vaccine candidate(s) and dose level(s); Phase 2/3: an expanded cohort and effica…", "primary_outcomes": [ { "measure": "Percentage of Participants With Local Reactions Within 7 Days After Dose 1: Phase 1", "time_frame": "Within 7 days after Dose 1", "description": "Local reactions included redness, swelling and, pain at the injection site, recorded by participants in an electronic diary (e-diary). Redness and swelling were measured and recorded in measuring device units. 1 measuring device unit =0.5 centimeter (cm). Redness and swelling were graded as mild (gr…" }, { "measure": "Percentage of Participants With Local Reactions Within 7 Days After Dose 2: Phase 1", "time_frame": "Within 7 days after Dose 2", "description": "Local reactions included redness, swelling and, pain at the injection site, recorded by participants in an e-diary. Redness and swelling were measured and recorded in measuring device units. 1 measuring device unit =0.5 cm. Redness and swelling were graded as mild (\\> 2.0 to 5.0 cm), moderate (\\> 5.…" }, { "measure": "Percentage of Participants With Systemic Events Within 7 Days After Dose 1: Phase 1", "time_frame": "Within 7 days after Dose 1", "description": "Systemic events included fever, fatigue, headache, chills, vomiting, diarrhea, new or worsened muscle pain, new or worsened joint pain recorded by participants or parents/legal guardians of participants using e-diary. Fever=temperature \\>=38.0 deg C categorized as \\>=38.0 to 38.4, \\>38.4 to 38.9, \\>…" } ], "secondary_outcomes": [ { "measure": "Geometric Mean Titers (GMTs) of Severe Acute Respiratory Syndrome Coronavirus 2 Neutralizing Titers: Phase 1", "time_frame": "7, 21 days after Dose 1; 7, 14 days and 1, 6 months after Dose 2", "description": "GMTs of severe acute respiratory syndrome coronavirus 2 neutralizing titers were reported in this outcome measure. SARS-CoV-2 neutralization assay - NT50 and SARS-CoV-2 neutralization assay - NT90 were evaluated and reported in this outcome measure." }, { "measure": "Geometric Mean Concentrations (GMCs) of Severe Acute Respiratory Syndrome Coronavirus 2: S1-binding and RBD-binding IgG Level Assay: Phase 1", "time_frame": "7, 21 days after Dose 1; 7, 14 days and 1, 6 months after Dose 2", "description": "GMCs of severe acute respiratory syndrome coronavirus S1-binding and RBD-binding IgG level were reported in this outcome measure." }, { "measure": "Geometric Mean Fold Rise (GMFR) of SARS-CoV-2 Neutralizing Titers: Phase 1", "time_frame": "7, 21 days after Dose 1; 7, 14 days and 1, 6 months after Dose 2", "description": "GMFR of SARS-CoV-2 neutralizing titers were reported in this outcome measure. HIV positive participants excluded." } ], "eligibility_criteria": "Inclusion Criteria:\n\n• Male or female participants between the ages of 18 and 55 years, inclusive, 65 and 85 years, inclusive, or ≥12 years, inclusive, at randomization (dependent upon study phase). For the boostability and protection-against-VOCs subset: Existing participants enrolled to receive a …", "number_of_participants": 46969 } ``` ## Run it From code, with a Fous API key in `FOUS_API_KEY`; the answer's `data` holds the output: ```bash curl https://api.fous.com/v1/runs \ -H "Authorization: Bearer $FOUS_API_KEY" \ -H "Content-Type: application/json" \ -d '{"method":"clinicaltrials.gov/get_trial","input":{"trial":"NCT04368728"}}' ``` From an AI agent connected to the Fous MCP server: its `run` with the same method and input. To connect one, give it `set up https://fous.com/SKILL.md`. ## Ask your agent - Pull up the full record for NCT04368728, including eligibility criteria and study arms - What are the primary outcomes and enrollment locations for the trial NCT03548935? - Find the registered trial titled 'Efficacy of semaglutide in adults with type 2 diabetes' and tell me its sponsor and phase - On ClinicalTrialsgov, I need the current recruitment status and contact details for NCT05123456 - Look up the study on the site whose official title mentions a 12-week mRNA vaccine booster and show its interventions and dates ## Input schema ```json { "type": "object", "required": [ "trial" ], "properties": { "trial": { "type": "string", "description": "The trial title or NCT trial number, for example NCT04368728." } } } ``` ## Output schema ```json { "type": "object", "required": [ "title", "official_title", "purpose_summary", "status", "phase", "sponsor", "start_date", "completion_date", "number_of_participants", "eligibility_criteria", "age_range", "arms", "treatments", "primary_outcomes", "secondary_outcomes", "locations", "public_contacts", "results_posted", "trial_number", "trial_link" ], "properties": { "arms": { "type": "array", "items": { "type": "object", "required": [ "name", "type", "description", "treatments" ], "properties": { "name": { "type": [ "string", "null" ] }, "type": { "type": [ "string", "null" ] }, "treatments": { "type": "array", "items": { "type": "string" } }, "description": { "type": [ "string", "null" ] } }, "additionalProperties": false } }, "phase": { "type": [ "string", "null" ] }, "title": { "type": [ "string", "null" ] }, "status": { "type": [ "string", "null" ] }, "sponsor": { "type": [ "string", "null" ] }, "age_range": { "type": [ "string", "null" ] }, "locations": { "type": "array", "items": { "type": "object", "required": [ "facility", "city", "country", "recruitment_status" ], "properties": { "city": { "type": [ "string", "null" ] }, "country": { "type": [ "string", "null" ] }, "facility": { "type": [ "string", "null" ] }, "recruitment_status": { "type": [ "string", "null" ] } }, "additionalProperties": false } }, "start_date": { "type": [ "string", "null" ], "format": "date" }, "treatments": { "type": "array", "items": { "type": "object", "required": [ "name", "type", "description", "arms" ], "properties": { "arms": { "type": "array", "items": { "type": "string" } }, "name": { "type": [ "string", "null" ] }, "type": { "type": [ "string", "null" ] }, "description": { "type": [ "string", "null" ] } }, "additionalProperties": false } }, "trial_link": { "type": "string" }, "trial_number": { "type": "string" }, "official_title": { "type": [ "string", "null" ] }, "results_posted": { "type": "boolean" }, "completion_date": { "type": [ "string", "null" ], "format": "date" }, "public_contacts": { "type": "array", "items": { "type": "object", "required": [ "name", "role", "phone", "email", "facility" ], "properties": { "name": { "type": [ "string", "null" ] }, "role": { "type": [ "string", "null" ] }, "email": { "type": [ "string", "null" ] }, "phone": { "type": [ "string", "null" ] }, "facility": { "type": [ "string", "null" ] } }, "additionalProperties": false } }, "purpose_summary": { "type": [ "string", "null" ] }, "primary_outcomes": { "type": "array", "items": { "type": "object", "required": [ "measure", "description", "time_frame" ], "properties": { "measure": { "type": [ "string", "null" ] }, "time_frame": { "type": [ "string", "null" ] }, "description": { "type": [ "string", "null" ] } }, "additionalProperties": false } }, "secondary_outcomes": { "type": "array", "items": { "type": "object", "required": [ "measure", "description", "time_frame" ], "properties": { "measure": { "type": [ "string", "null" ] }, "time_frame": { "type": [ "string", "null" ] }, "description": { "type": [ "string", "null" ] } }, "additionalProperties": false } }, "eligibility_criteria": { "type": [ "string", "null" ] }, "number_of_participants": { "type": [ "integer", "null" ] } }, "additionalProperties": false } ``` ## See more - [ClinicalTrials.gov API: Search clinical trials](https://fous.com/methods/clinicaltrials.gov/search-trials.md): Finds ClinicalTrials.gov studies for a condition or medicine. You can filter by location, distance, recruitment status and phase. With a location, results are ordered by distance to the closest eligible site. - [ClinicalTrials.gov API: List company trials](https://fous.com/methods/clinicaltrials.gov/list-company-trials.md): Lists ClinicalTrials.gov studies run or funded by a sponsor, newest start date first, with optional phase, status and condition filters. - [NIH API: Get PubMed article](https://fous.com/methods/pubmed.ncbi.nlm.nih.gov/get-article.md): Gets the full PubMed abstract and publication details for one article by title, PubMed link, or PubMed number (PMID). A title is searched in PubMed titles first and must closely match a found article. Some articles have no abstract or free full text. - [NIH API: Search PubMed articles](https://fous.com/methods/pubmed.ncbi.nlm.nih.gov/search-articles.md): Finds PubMed medical and life-science articles by topic, with publication details and free full-text links when PubMed confirms them. - [NIH API: Search grants](https://fous.com/methods/reporter.nih.gov/search-grants.md): Finds NIH research grants by topic, organisation, or researcher name. Searches the last five fiscal years by default. - [NIH API: Search diagnosis codes](https://fous.com/methods/clinicaltables.nlm.nih.gov/search-diagnosis-codes.md): Finds ICD-10-CM diagnosis codes and official names from a plain-language condition description, retrying with simplified wording when the first search finds nothing. - [Google API: Get patent details](https://fous.com/methods/patents.google.com/get-patent.md): Gets one public patent or published application by number, title, or Google Patents link, with claims, citations, family and classifications. - [Grants.gov API: Search grant opportunities](https://fous.com/methods/grants.gov/search-grants.md): Finds U.S. federal grant opportunities by topic, agency, applicant type and status, with funding and eligibility details. Open results exclude opportunities whose closing date has passed. - [All ClinicalTrials.gov methods](https://fous.com/methods/clinicaltrials.gov.md)