nih-reporter

NIH RePORTER API

Public API exposing NIH and non-NIH agency awards (and linked publications). No authentication. Two endpoints — projects and publications. Returns JSON.

Endpoints

Endpoint	Use
POST https://api.reporter.nih.gov/v2/projects/search	Awards / projects
POST https://api.reporter.nih.gov/v2/publications/search	Publications linked to awards

Both are POST only (GET returns 405). Body is JSON, Content-Type: application/json.

Interactive Swagger docs: https://api.reporter.nih.gov/?urls.primaryName=V2.0

Rate Limits — Do Not Ignore

NIH publishes hard guidance, with IP-blocking as the stated consequence:

• ≤ 1 request per second sustained.
• Large jobs (anything that paginates beyond a few pages): run weekends, or weekdays 9pm–5am EST.
• Backoff on 429 and 5xx; do not retry tight.

For any pull > ~50 pages, add time.sleep(1.1) between requests and schedule for off-hours. Use a User-Agent that identifies you.

Pagination Limits

Field	Default	Max
limit	50	500
offset (projects)	0	14,999 (offset+limit ≤ 15,000)
offset (publications)	0	9,999

The 15k cap is hard — if your result set exceeds it, split the query by fiscal year, IC, or activity code rather than trying to page past it.

To know total results before paginating: the response includes meta.total. Issue one request with limit: 1 first if you need to plan a pull.

Minimal Request

curl -sS -X POST https://api.reporter.nih.gov/v2/projects/search \
  -H 'Content-Type: application/json' \
  -d '{
    "criteria": {"fiscal_years": [2024], "pi_names": [{"any_name": "Mitchell"}]},
    "include_fields": ["ProjectNum","ProjectTitle","Organization","AwardAmount","FiscalYear","PrincipalInvestigators"],
    "limit": 25,
    "offset": 0,
    "sort_field": "project_start_date",
    "sort_order": "desc"
  }' | jq .

Payload Shape

{
  "criteria": { ... filters ... },
  "include_fields": [ ... PascalCase field names ... ],
  "exclude_fields": [ ... ],
  "offset": 0,
  "limit": 50,
  "sort_field": "project_start_date",
  "sort_order": "desc",
  "use_relevance": false
}

Three name conventions in the same payload — this is the #1 source of bugs:

Where	Convention	Example
criteria keys	snake_case	fiscal_years, pi_names, org_states
include_fields values	PascalCase	FiscalYear, PrincipalInvestigators, OrgState
Response JSON keys	snake_case	fiscal_year, principal_investigators, org_state

If you send "include_fields": ["fiscal_year"] it is silently ignored — the API returns everything. Always PascalCase the include list.

For the full criteria↔include↔response mapping, see references/field-mapping.md.

Common Criteria Patterns

Text search (title / abstract / terms)

"advanced_text_search": {
  "operator": "and",
  "search_field": "projecttitle,abstracttext,terms",
  "search_text": "single-cell pancreatic"
}

• operator: "and", "or", or "advanced" (advanced supports AND/OR/NOT + quoted phrases).
• search_field: comma-joined subset of projecttitle, abstracttext, terms.
• Stop-words ignored automatically. Quote phrases for exact match: "\"breast cancer\"".

PI / PO names (object array)

"pi_names": [{"any_name": "Smith"}],
"pi_names": [{"last_name": "Welch", "first_name": "John"}]

Each list element is an object with one of any_name, first_name, middle_name, last_name. Multiple list elements are OR'd. any_name: "" is a no-op placeholder when only specifying a sub-field — keep it if you copy from NIH examples.

Organization

"org_names": ["EMORY UNIVERSITY", "JOHNS HOPKINS UNIVERSITY"],
"org_names_exact_match": ["FRED HUTCHINSON CANCER CENTER"],
"org_states": ["WA","CA"],
"org_countries": ["UNITED STATES"],
"org_cities": ["SEATTLE"]

• org_names is wildcard/partial by default — "HARVARD" matches HARVARD UNIVERSITY, HARVARD MEDICAL SCHOOL, etc.
• Use org_names_exact_match when you need exactly one institution.

Fiscal year / dates

"fiscal_years": [2023, 2024, 2025],
"project_start_date": {"from_date":"2024-01-01","to_date":"2024-12-31"},
"project_end_date":   {"from_date":"2024-01-01","to_date":"2026-12-31"},
"award_notice_date":  {"from_date":"2024-01-01","to_date":"2024-12-31"},
"date_added":         {"from_date":"2024-01-01","to_date":"2024-12-31"}

fiscal_years: [] matches all years. date_added is only populated from 2011-01-01 forward.

IC / agency / activity / mechanism

"agencies": ["NCI","NIGMS","NHGRI"],
"activity_codes": ["R01","R35","P20","U54"],
"award_types": ["1","2","5","4C","4N"],
"funding_mechanism": ["RP","SB","RC","OR","TR","TI","CO","NSRDC","SRDC","IAA","IM","Other"]

• agencies takes IC acronyms (NCI, not CA). Full list in references/ic-codes.md.
• award_types is the application type code (1=new, 2=renewal, 3=supplement, 4C/4N=Type 4 sub-types, 5=non-competing continuation, etc.).
• For funding_mechanism, value "Other" is a combined search for UK + OT + CP — there is no "UK" value you can pass directly.

Amounts

"award_amount_range": {"min_amount": 250000, "max_amount": 5000000}

Both fields required. Costs only populated from FY 2012 onward (and never for SBIR/STTR).

Project numbers

"project_nums": ["R01CA123456*", "5R01HG*"],
"project_num_split": {
  "appl_type_code":"1","activity_code":"R01","ic_code":"CA",
  "serial_num":"123456","support_year":"01","suffix_code":""
}

• project_nums accepts wildcards with *. Matches both core_project_num and project_num.
• project_num_split matches exactly on components — useful for parsing/joining ExPORTER-style IDs.

Spending categories (RCDC)

"spending_categories": {"values": [27, 60, 105], "match_all": false}

• match_all: true returns projects in all listed categories (intersection); false returns projects in any (union).
• IDs are numeric — see references/spending-categories.md for the FY2024 list (e.g. 27=Aging, 105=Brain Disorders, 132=Cancer).

COVID-19

"covid_response": ["Reg-CV","CV","C3","C4","C5","C6"]

Or "All" for any COVID-funded project. Reg-CV = regular appropriations; CV/C3/C4/C5/C6 = the five supplemental appropriations acts.

Booleans / flags

"include_active_projects": true,
"exclude_subprojects": true,
"sub_project_only": false,
"multi_pi_only": false,
"newly_added_projects_only": false,
"is_agency_admin": true,
"is_agency_funding": true

include_active_projects: true restricts to currently-active awards (budget end date ≥ today).

Sorting

sort_field accepts the criteria (snake_case) name of the field. Common ones: project_start_date, project_end_date, award_notice_date, award_amount, fiscal_year, appl_id. sort_order: "asc" or "desc". Default use_relevance: false; set true only when combined with a text search.

Publications Endpoint

Much narrower — only three criteria fields:

{
  "criteria": {
    "pmids": [12345678, 23456789],
    "appl_ids": [10372367],
    "core_project_nums": ["R01CA123456", "R01HG*"]
  },
  "limit": 500,
  "offset": 0
}

Response per row: coreproject (core project num), pmid, applid (latest application ID). To enrich (title, journal, authors): pass the pmid list to PubMed via the plugin_pubmed_PubMed MCP tools.

Reference Sheets

Field mapping, IC code list, and spending category IDs live in references/:

• references/field-mapping.md — every criteria → include_fields → response-key triple, with types and notes.
• references/ic-codes.md — IC acronyms (use in agencies) ↔ org code ↔ full name.
• references/spending-categories.md — FY2024 numeric IDs ↔ names.
• references/recipes.md — copy-paste payloads for common questions (who funds X, awards at org Y, all R01s in FY2024, etc.).

Quick Python Helper

import requests, time

URL = "https://api.reporter.nih.gov/v2/projects/search"
HEADERS = {"Content-Type": "application/json", "User-Agent": "[email protected]"}

def search_all(criteria, include_fields, page_size=500, sleep=1.1):
    """Paginate through all results. Stops at the 15k offset cap."""
    offset, out = 0, []
    while offset < 15000:
        body = {"criteria": criteria, "include_fields": include_fields,
                "offset": offset, "limit": page_size,
                "sort_field": "project_start_date", "sort_order": "desc"}
        r = requests.post(URL, json=body, headers=HEADERS, timeout=60)
        r.raise_for_status()
        data = r.json()
        out.extend(data["results"])
        total = data["meta"]["total"]
        if offset + page_size >= total: break
        offset += page_size
        time.sleep(sleep)
    return out, total

If total > 15000, partition by fiscal_years (one year at a time) or by agencies and concatenate.

Common Gotchas

• include_fields is PascalCase, not the criteria name or the response name. FiscalYear, not fiscal_year. Wrong casing → silently ignored, full payload returned (slow).
• fiscal_years: [] ≠ omitting the key. Empty array = "all years"; omitting the key may default to recent years depending on other filters.
• org_names is partial-match — "WASHINGTON" matches University of Washington, Washington State, Washington University in St. Louis. Use org_names_exact_match for precision.
• award_types: ["4"] does not match Type 4 awards — use ["4C","4N"] (the documented sub-types).
• Direct/indirect cost fields are null for SBIR/STTR and for pre-FY2012 awards. Don't trust 0 = $0 funding; check the year/mechanism.
• Offset cap is 15,000. Beyond that, the API returns an error. Partition the query.
• pi_names / po_names items are objects, not strings. ["Smith"] errors; [{"any_name": "Smith"}] works.
• Dates in responses are ISO timestamps with Z ("2021-03-15T04:00:00Z"), not date-only. Parse as datetime, not date.
• agency_ic_fundings is a list — a project funded by multiple ICs has multiple rows. Sum total_cost across the list if you want total project funding for that FY.
• Stale or experimental wrappers exist (repoRter.nih for R, pynih for Python). The R one is well-maintained as of 2024; useful as a reference for payload shape but not required.

Project Detail Page

Each project has a human-readable page: https://reporter.nih.gov/project-details/{appl_id}. Useful for spot-checking API results and for citations in summaries.