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OpenAPI Specification

openapi: 3.2.0
info:
  title: NextBillion.ai Isochrone API
  version: '2026-10-13'
  description: 'GENERATED FROM DOCUMENTATION by API Evangelist on 2026-10-13: 18 operation(s) read from 8 public documentation page(s) (each operation names its page in x-source). This is not the provider''s published contract; NextBillion.ai has published no machine-readable contract that the pipeline could find. Engine: local.'
  x-evidence-tiers:
    code-example: 5
    documentation: 13
    pages-with-code: 5
    pages-read: 8
  x-generated-from: documentation
  x-provenance: generated
  x-authored-by: API Evangelist
  x-generated: '2026-10-13'
  x-generator: generate-contract-from-docs.py
  x-engine: local
  x-sources:
  - https://docs.nextbillion.ai/routing/directions-api
  - https://docs.nextbillion.ai/routing/navigation-api
  - https://docs.nextbillion.ai/optimization/route-optimization-api
  - https://docs.nextbillion.ai/routing/distance-matrix-api/synchronous
  - https://docs.nextbillion.ai/routing/isochrone-api
  - https://docs.nextbillion.ai/routing/hours-of-service-api
  - https://docs.nextbillion.ai/optimization/driver-assignment-api
  - https://docs.nextbillion.ai/routing/distance-matrix-api/asynchronous
servers:
- url: https://api.nextbillion.io
tags:
- name: Isochrone
paths:
  /isochrone/json:
    get:
      operationId: get_isochrone_json
      tags:
      - Isochrone
      summary: GET /isochrone/json
      x-source: https://docs.nextbillion.ai/routing/isochrone-api
      parameters:
      - name: key
        in: query
        required: false
        schema:
          type: string
      responses:
        '200':
          description: Success (status as documented)
      x-evidence:
        kind: code-example
        language: curl
        snippet: "curl --location 'https://api.nextbillion.io/isochrone/json?key=<your_api_key>&coordinates=34.04715844,-118.24977187&mode=car&contours_minutes=5' \n Response \n 1 { 2 \"features\" : [ ... ] , 3 \"type\" : \"FeatureCollection\" 4 } Expand \n Here is how the above response looks on a map. We can easily visualize the area reachable within 5 minutes. It is enclosed by a contour line or a polygon around the star"