TaxJar

TaxJar Nexus API

Nexus region tracking

GitHub OpenAPI

Operations 1

GET /nexus/regions List nexus regions #

Documentation

📖
Documentation
https://developers.taxjar.com/api/reference/

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/taxjar/refs/heads/main/openapi/taxjar-nexus-api-openapi.yml

Schemas & Data

📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/taxjar/refs/heads/main/json-schema/taxjar-order-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/taxjar/refs/heads/main/json-schema/taxjar-tax-calculation-schema.json

Other Resources

🔗
Guides
https://developers.taxjar.com/api/guides/
🔗
Sandbox
https://api.sandbox.taxjar.com/v2/

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API 
curl "https://apis.io/api/v1/apis/taxjar-nexus-api"
All apis 
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

taxjar-nexus-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: TaxJar Sales Tax Categories Nexus API
  description: REST API for real-time sales tax calculation, rooftop-level rate lookups, tax category listing, transaction management (orders and refunds), customer exemption management, nexus region tracking, address validation, and VAT validation. Supports token-based authentication via Authorization header. TaxJar is a Stripe company providing sub-20ms response times and 99.999% historical uptime.
  version: '2.0'
  contact:
    name: TaxJar Developer Support
    url: https://support.taxjar.com/category/233-taxjar-api
  termsOfService: https://www.taxjar.com/terms/
  x-api-id: taxjar-sales-tax
servers:
- url: https://api.taxjar.com/v2
  description: Production
- url: https://api.sandbox.taxjar.com/v2
  description: Sandbox
security:
- bearerAuth: []
tags:
- name: Nexus
  description: Nexus region tracking
paths:
  /nexus/regions:
    get:
      operationId: listNexusRegions
      summary: List nexus regions
      description: Returns a list of nexus regions (states/countries where you have tax nexus) for the authenticated account.
      tags:
      - Nexus
      responses:
        '200':
          description: List of nexus regions
          content:
            application/json:
              schema:
                type: object
                properties:
                  regions:
                    type: array
                    items:
                      $ref: '#/components/schemas/NexusRegion'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    Error:
      type: object
      properties:
        error:
          type: string
          description: Error type
        detail:
          type: string
          description: Human-readable error detail
        status:
          type: integer
          description: HTTP status code
    NexusRegion:
      type: object
      properties:
        country_code:
          type: string
          description: Two-letter ISO country code
          example: US
        country:
          type: string
          description: Country name
          example: United States
        region_code:
          type: string
          description: Two-letter state/region code
          example: CA
        region:
          type: string
          description: State/region name
          example: California
  responses:
    Unauthorized:
      description: Unauthorized - invalid or missing API token
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Use your TaxJar API token. Format: "Bearer [token]" or "Token token=[token]"'