openapi: 3.1.0
info:
  title: CTA Bus Tracker Arrivals Bulletins API
  description: The Chicago Transit Authority Bus Tracker API provides real-time bus arrival predictions, vehicle locations, route patterns, route lists, and stop directories for the CTA bus network. Access requires an API key issued by the CTA Developer Center.
  version: 2.0.0
  contact:
    name: CTA Developer Center
    url: https://www.transitchicago.com/developers/
  license:
    name: CTA Developer License Agreement
    url: https://www.transitchicago.com/developers/terms/
servers:
- url: http://www.ctabustracker.com/bustime/api/v2
  description: CTA Bus Tracker v2 production
security:
- apiKey: []
tags:
- name: Bulletins
paths:
  /getservicebulletins:
    get:
      operationId: getServiceBulletins
      summary: Get Service Bulletins
      description: Returns active service bulletins for routes or stops.
      tags:
      - Bulletins
      parameters:
      - $ref: '#/components/parameters/key'
      - name: rt
        in: query
        schema:
          type: string
      - name: stpid
        in: query
        schema:
          type: string
      - $ref: '#/components/parameters/format'
      responses:
        '200':
          description: Bulletin list
components:
  parameters:
    format:
      name: format
      in: query
      description: Response format (xml or json). Defaults to XML.
      schema:
        type: string
        enum:
        - xml
        - json
    key:
      name: key
      in: query
      required: true
      description: CTA Bus Tracker API key.
      schema:
        type: string
  securitySchemes:
    apiKey:
      type: apiKey
      in: query
      name: key