TaxJar

TaxJar is a sales tax automation platform, now a Stripe company, providing APIs for real-time sales tax calculations, rooftop-level rate lookups, transaction recording, and automated filing across US states and international jurisdictions. The platform supports e-commerce businesses of all sizes with sub-20ms response times, 99.999% historical uptime, and AI-powered product tax classification. TaxJar handles nexus tracking, exemption certificate management, and AutoFile returns so merchants can stay compliant without manual effort. Official client libraries are available for Ruby, Python, PHP, Node.js, C#/.NET, Java, and Go.

TaxJar publishes 9 APIs on the APIs.io network, including Categories API, Customers API, Nexus API, and 6 more. Tagged areas include Sales Tax, Tax Compliance, E-Commerce, Tax Calculation, and Tax Automation.

The TaxJar catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

TaxJar’s developer surface includes authentication, documentation, API reference, engineering blog, pricing, support, signup flow, and 15 more developer resources.

🌐 Visit website 📡 Source on GitHub

58.1/100 strong ▬ flat Agent 34/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1

AccessPaidSelf serve

9 APIs

Sales TaxTax ComplianceE-CommerceTax CalculationTax AutomationStripeFinTech

Kin Score

Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1

Composite quality — 58.1/100 · strong

Contract Quality 20.1 / 25

Developer Ergonomics 7.4 / 20

Commercial Clarity 9.5 / 20

Operational Transparency 5.5 / 13

Governance 8.3 / 12

Discoverability 7.4 / 10

Agent readiness — 34/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/taxjar: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 9

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Taxjar Rate Limits

1 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

TaxJar Order Transaction

20 properties

JSON SCHEMA

TaxJar Tax Calculation Response

1 properties

JSON SCHEMA

Examples 3

Example request and response payloads for these APIs.

Get Started 1

Portal, sign-up, and the first successful call

Signup

Signup

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Vocabulary

Vocabulary

JSONLDContext

JSONLDContext

Build 2

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

StatusPage

StatusPage

Support

Support

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 4

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

BlogFeed

BlogFeed

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: taxjar
name: TaxJar
description: TaxJar is a sales tax automation platform, now a Stripe company, providing APIs for real-time sales tax calculations,
  rooftop-level rate lookups, transaction recording, and automated filing across US states and international jurisdictions.
  The platform supports e-commerce businesses of all sizes with sub-20ms response times, 99.999% historical uptime, and AI-powered
  product tax classification. TaxJar handles nexus tracking, exemption certificate management, and AutoFile returns so merchants
  can stay compliant without manual effort. Official client libraries are available for Ruby, Python, PHP, Node.js, C#/.NET,
  Java, and Go.
type: Index
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/taxjar.png
tags:
- Sales Tax
- Tax Compliance
- E-Commerce
- Tax Calculation
- Tax Automation
- Stripe
- FinTech
url: https://raw.githubusercontent.com/api-evangelist/taxjar/refs/heads/main/apis.yml
created: '2026-06-12'
modified: '2026-06-12'
specificationVersion: '0.19'
apis:
- aid: taxjar:taxjar-categories-api
  name: TaxJar Categories API
  description: Product tax categories
  humanURL: https://developers.taxjar.com/api/reference/
  baseURL: https://api.taxjar.com/v2/
  tags:
  - Categories
  properties:
  - type: OpenAPI
    url: openapi/taxjar-categories-api-openapi.yml
  - type: Documentation
    url: https://developers.taxjar.com/api/reference/
  - type: Guides
    url: https://developers.taxjar.com/api/guides/
  - type: Sandbox
    url: https://api.sandbox.taxjar.com/v2/
  - type: JSONSchema
    url: json-schema/taxjar-order-schema.json
  - type: JSONSchema
    url: json-schema/taxjar-tax-calculation-schema.json
- aid: taxjar:taxjar-customers-api
  name: TaxJar Customers API
  description: Customer exemption management
  humanURL: https://developers.taxjar.com/api/reference/
  baseURL: https://api.taxjar.com/v2/
  tags:
  - Customers
  properties:
  - type: OpenAPI
    url: openapi/taxjar-customers-api-openapi.yml
  - type: Documentation
    url: https://developers.taxjar.com/api/reference/
  - type: Guides
    url: https://developers.taxjar.com/api/guides/
  - type: Sandbox
    url: https://api.sandbox.taxjar.com/v2/
  - type: JSONSchema
    url: json-schema/taxjar-order-schema.json
  - type: JSONSchema
    url: json-schema/taxjar-tax-calculation-schema.json
- aid: taxjar:taxjar-nexus-api
  name: TaxJar Nexus API
  description: Nexus region tracking
  humanURL: https://developers.taxjar.com/api/reference/
  baseURL: https://api.taxjar.com/v2/
  tags:
  - Nexus
  properties:
  - type: OpenAPI
    url: openapi/taxjar-nexus-api-openapi.yml
  - type: Documentation
    url: https://developers.taxjar.com/api/reference/
  - type: Guides
    url: https://developers.taxjar.com/api/guides/
  - type: Sandbox
    url: https://api.sandbox.taxjar.com/v2/
  - type: JSONSchema
    url: json-schema/taxjar-order-schema.json
  - type: JSONSchema
    url: json-schema/taxjar-tax-calculation-schema.json
- aid: taxjar:taxjar-rates-api
  name: TaxJar Rates API
  description: Sales tax rate lookups
  humanURL: https://developers.taxjar.com/api/reference/
  baseURL: https://api.taxjar.com/v2/
  tags:
  - Rates
  properties:
  - type: OpenAPI
    url: openapi/taxjar-rates-api-openapi.yml
  - type: Documentation
    url: https://developers.taxjar.com/api/reference/
  - type: Guides
    url: https://developers.taxjar.com/api/guides/
  - type: Sandbox
    url: https://api.sandbox.taxjar.com/v2/
  - type: JSONSchema
    url: json-schema/taxjar-order-schema.json
  - type: JSONSchema
    url: json-schema/taxjar-tax-calculation-schema.json
- aid: taxjar:taxjar-summary-rates-api
  name: TaxJar Summary Rates API
  description: Summarized sales tax rates by region
  humanURL: https://developers.taxjar.com/api/reference/
  baseURL: https://api.taxjar.com/v2/
  tags:
  - Summary Rates
  properties:
  - type: OpenAPI
    url: openapi/taxjar-summary-rates-api-openapi.yml
  - type: Documentation
    url: https://developers.taxjar.com/api/reference/
  - type: Guides
    url: https://developers.taxjar.com/api/guides/
  - type: Sandbox
    url: https://api.sandbox.taxjar.com/v2/
  - type: JSONSchema
    url: json-schema/taxjar-order-schema.json
  - type: JSONSchema
    url: json-schema/taxjar-tax-calculation-schema.json
- aid: taxjar:taxjar-taxes-api
  name: TaxJar Taxes API
  description: Sales tax calculation
  humanURL: https://developers.taxjar.com/api/reference/
  baseURL: https://api.taxjar.com/v2/
  tags:
  - Taxes
  properties:
  - type: OpenAPI
    url: openapi/taxjar-taxes-api-openapi.yml
  - type: Documentation
    url: https://developers.taxjar.com/api/reference/
  - type: Guides
    url: https://developers.taxjar.com/api/guides/
  - type: Sandbox
    url: https://api.sandbox.taxjar.com/v2/
  - type: JSONSchema
    url: json-schema/taxjar-order-schema.json
  - type: JSONSchema
    url: json-schema/taxjar-tax-calculation-schema.json
- aid: taxjar:taxjar-transactions-orders-api
  name: TaxJar Transactions - Orders API
  description: Order transaction management
  humanURL: https://developers.taxjar.com/api/reference/
  baseURL: https://api.taxjar.com/v2/
  tags:
  - Transactions - Orders
  properties:
  - type: OpenAPI
    url: openapi/taxjar-transactions-orders-api-openapi.yml
  - type: Documentation
    url: https://developers.taxjar.com/api/reference/
  - type: Guides
    url: https://developers.taxjar.com/api/guides/
  - type: Sandbox
    url: https://api.sandbox.taxjar.com/v2/
  - type: JSONSchema
    url: json-schema/taxjar-order-schema.json
  - type: JSONSchema
    url: json-schema/taxjar-tax-calculation-schema.json
- aid: taxjar:taxjar-transactions-refunds-api
  name: TaxJar Transactions - Refunds API
  description: Refund transaction management
  humanURL: https://developers.taxjar.com/api/reference/
  baseURL: https://api.taxjar.com/v2/
  tags:
  - Transactions - Refunds
  properties:
  - type: OpenAPI
    url: openapi/taxjar-transactions-refunds-api-openapi.yml
  - type: Documentation
    url: https://developers.taxjar.com/api/reference/
  - type: Guides
    url: https://developers.taxjar.com/api/guides/
  - type: Sandbox
    url: https://api.sandbox.taxjar.com/v2/
  - type: JSONSchema
    url: json-schema/taxjar-order-schema.json
  - type: JSONSchema
    url: json-schema/taxjar-tax-calculation-schema.json
- aid: taxjar:taxjar-validations-api
  name: TaxJar Validations API
  description: Address and VAT validation
  humanURL: https://developers.taxjar.com/api/reference/
  baseURL: https://api.taxjar.com/v2/
  tags:
  - Validations
  properties:
  - type: OpenAPI
    url: openapi/taxjar-validations-api-openapi.yml
  - type: Documentation
    url: https://developers.taxjar.com/api/reference/
  - type: Guides
    url: https://developers.taxjar.com/api/guides/
  - type: Sandbox
    url: https://api.sandbox.taxjar.com/v2/
  - type: JSONSchema
    url: json-schema/taxjar-order-schema.json
  - type: JSONSchema
    url: json-schema/taxjar-tax-calculation-schema.json
common:
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/taxjar/overview
- type: AgenticAccess
  url: agentic-access/taxjar-agentic-access.yml
- type: TrustCenter
  url: security/taxjar-trust-center.yml
- type: DomainSecurity
  url: security/taxjar-domain-security.yml
- type: Authentication
  url: authentication/taxjar-authentication.yml
- type: Website
  url: https://www.taxjar.com
- type: Documentation
  url: https://developers.taxjar.com/
- type: APIReference
  url: https://developers.taxjar.com/api/reference/
- type: GitHubOrganization
  url: https://github.com/taxjar
- type: LinkedIn
  url: https://www.linkedin.com/company/taxjar
- type: Blog
  url: https://developers.taxjar.com/blog/
- type: Pricing
  url: https://www.taxjar.com/pricing/
- type: StatusPage
  url: https://status.taxjar.com
- type: X
  url: https://x.com/taxjardev
- type: Support
  url: https://support.taxjar.com/category/233-taxjar-api
- type: Signup
  url: https://app.taxjar.com/api_sign_up/
- type: Plans
  url: plans/taxjar-plans-pricing.yml
- type: RateLimits
  url: rate-limits/taxjar-rate-limits.yml
- type: FinOps
  url: finops/taxjar-finops.yml
- type: Vocabulary
  url: vocabulary/taxjar-vocabulary.yml
- type: JSONLDContext
  url: json-ld/taxjar-context.jsonld
- type: BlogFeed
  url: blogs/blogs.json
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com