Sleeper Matchups API

openapi: 3.1.0
info:
  title: Sleeper Drafts Matchups API
  version: '1.0'
  description: The Sleeper API is a read-only HTTP API that exposes public fantasy sports data — users, leagues, rosters, matchups, transactions, drafts, draft picks, traded picks, and players. It is free to use and requires no API token, because no content can be modified through it. All endpoints are GET requests that return JSON.
  contact:
    name: Sleeper API Docs
    url: https://docs.sleeper.com/
  x-provenance:
    generated: '2026-07-21'
    method: generated
    source: https://docs.sleeper.com/
    note: Authored by the API Evangelist enrichment pipeline from the operations documented at docs.sleeper.com. Sleeper does not publish an OpenAPI; every path, method, and parameter here is transcribed from the public docs.
servers:
- url: https://api.sleeper.app/v1
  description: Sleeper read-only API (v1)
tags:
- name: Matchups
paths:
  /league/{league_id}/matchups/{week}:
    get:
      operationId: getLeagueMatchups
      summary: Get all matchups in a league for a week
      tags:
      - Matchups
      parameters:
      - name: league_id
        in: path
        required: true
        schema:
          type: string
      - name: week
        in: path
        required: true
        schema:
          type: integer
          example: 1
      responses:
        '200':
          description: Array of matchup objects.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Matchup'
        '404':
          $ref: '#/components/responses/NotFound'
        '429':
          $ref: '#/components/responses/TooManyRequests'
components:
  schemas:
    Matchup:
      type: object
      properties:
        roster_id:
          type: integer
          description: References a Roster by roster_id
        matchup_id:
          type: integer
          description: Rosters sharing a matchup_id play each other
        points:
          type: number
        players:
          type: array
          items:
            type: string
        starters:
          type: array
          items:
            type: string
        players_points:
          type: object
        custom_points:
          type: number
          nullable: true
  responses:
    NotFound:
      description: The requested resource was not found.
    TooManyRequests:
      description: Rate limit exceeded — stay under 1000 API calls per minute to avoid IP blocks.