United States National Library of Medicine Fetch API

openapi: 3.0.3
info:
  title: NCBI URL BLAST Fetch API
  description: 'The NCBI BLAST URL API allows developers to submit BLAST (Basic Local Alignment Search Tool) sequence searches for processing at NCBI using HTTPS. The API operates in three phases: (1) PUT request to submit a search and receive a request ID (RID), (2) polling GET requests to check search status, (3) GET request to retrieve results in the desired format. Supports nucleotide (blastn, blastx) and protein (blastp, tblastn, tblastx) searches.'
  version: 1.0.0
  contact:
    name: NCBI BLAST
    url: https://blast.ncbi.nlm.nih.gov/doc/blast-help/developerinfo.html
  license:
    name: Public Domain
    url: https://www.usa.gov/government-works
servers:
- url: https://blast.ncbi.nlm.nih.gov/blast
  description: NCBI BLAST Server
tags:
- name: Fetch
  description: Retrieve records from Entrez databases
paths:
  /efetch.fcgi:
    get:
      operationId: fetchRecords
      summary: Fetch Records
      description: Retrieve full records from an Entrez database in various formats. Commonly used to retrieve PubMed article abstracts, nucleotide sequences in FASTA format, or gene records.
      tags:
      - Fetch
      parameters:
      - name: db
        in: query
        description: Target Entrez database
        required: true
        schema:
          type: string
        example: pubmed
      - name: id
        in: query
        description: Comma-separated list of UIDs to retrieve
        required: false
        schema:
          type: string
        example: 33515491,33515492
      - name: api_key
        in: query
        description: NCBI API key
        required: false
        schema:
          type: string
      - name: rettype
        in: query
        description: Record type to return (e.g. abstract, medline, fasta, gb, docsum)
        required: false
        schema:
          type: string
        example: abstract
      - name: retmode
        in: query
        description: Output format
        required: false
        schema:
          type: string
          enum:
          - xml
          - text
          - json
          - asn.1
      - name: retmax
        in: query
        description: Maximum number of records to retrieve
        required: false
        schema:
          type: integer
          default: 20
      - name: retstart
        in: query
        description: Starting index in the UID list
        required: false
        schema:
          type: integer
      responses:
        '200':
          description: Requested records in the specified format
          content:
            text/xml:
              schema:
                type: string
            text/plain:
              schema:
                type: string
  /esummary.fcgi:
    get:
      operationId: getSummaries
      summary: Get Document Summaries
      description: Retrieve document summaries (DocSums) for records from any Entrez database. Returns a concise summary of record attributes including title, authors, journal, and publication date for PubMed records.
      tags:
      - Fetch
      parameters:
      - name: db
        in: query
        description: Target Entrez database
        required: true
        schema:
          type: string
        example: pubmed
      - name: id
        in: query
        description: Comma-separated list of UIDs
        required: false
        schema:
          type: string
        example: 33515491,33515492
      - name: api_key
        in: query
        description: NCBI API key
        required: false
        schema:
          type: string
      - name: retmode
        in: query
        required: false
        schema:
          type: string
          enum:
          - json
          - xml
          default: json
      responses:
        '200':
          description: Document summaries
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ESummaryResult'
components:
  schemas:
    ESummaryResult:
      type: object
      description: Document summaries from Entrez
      properties:
        result:
          type: object
          description: Map of UID to document summary
          additionalProperties:
            type: object
            properties:
              uid:
                type: string
              pubdate:
                type: string
              epubdate:
                type: string
              source:
                type: string
              authors:
                type: array
                items:
                  type: object
              title:
                type: string
              volume:
                type: string
              issue:
                type: string
              pages:
                type: string
              fulljournalname:
                type: string
              doi:
                type: string
              pmcrefcount:
                type: integer
              pubtype:
                type: array
                items:
                  type: string