Kintsugi

Kintsugi is an AI-driven sales tax compliance and automation platform that calculates US sales tax, VAT, and GST in real time, monitors economic and physical nexus, manages exemptions and registrations, and auto-prepares and files returns. Its REST API exposes tax estimation, transactions, products, address validation, nexus, exemptions, registrations, and filings, authenticated with an API key plus organization ID header.

Kintsugi publishes 9 APIs on the APIs.io network, including Address Validation API, Customers API, Exemptions API, and 6 more. Tagged areas include Sales Tax, Tax Compliance, Tax Automation, VAT, and GST.

Kintsugi’s developer surface includes authentication, documentation, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

35.9/100 thin ▬ flat Agent 20/100 agent aware Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0

AccessFreemiumSelf serve⚡ Free to try

9 APIs

Sales Tax Tax Compliance Tax Automation VAT GST Nexus Artificial Intelligence

Kin Score

Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0

Composite quality — 35.9/100 · thin

Contract Quality 13.2 / 25

Developer Ergonomics 4.3 / 20

Access Clarity 7.9 / 20

Operational Transparency 3.1 / 13

Contract Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Surface 0 / 5

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/kintsugi: 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.

Open Collections 11

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Rate Limits 1

Documented rate limits and quota policies.

Kintsugi Rate Limits

2 limits

RATE LIMITS

FinOps 1

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

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: kintsugi
url: https://raw.githubusercontent.com/api-evangelist/kintsugi/refs/heads/main/apis.yml
name: Kintsugi
kind: company
description: Kintsugi is an AI-driven sales tax compliance and automation platform that calculates US sales tax, VAT, and
  GST in real time, monitors economic and physical nexus, manages exemptions and registrations, and auto-prepares and files
  returns. Its REST API exposes tax estimation, transactions, products, address validation, nexus, exemptions, registrations,
  and filings, authenticated with an API key plus organization ID header.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · 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/kintsugi.png
tags:
- Sales Tax
- Tax Compliance
- Tax Automation
- VAT
- GST
- Nexus
- Artificial Intelligence
tags_raw:
- Sales Tax
- Tax Compliance
- Tax Automation
- VAT
- GST
- Nexus
- AI
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.23'
apis:
- aid: kintsugi:kintsugi-address-validation-api
  name: Kintsugi Address Validation API
  description: Address search and suggestions for jurisdiction assignment.
  humanURL: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  baseURL: https://api.trykintsugi.com/v1
  tags:
  - Address Validation
  properties:
  - type: OpenAPI
    url: openapi/kintsugi-address-validation-api-openapi.yml
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/tax-estimation/estimate-tax
  - type: PostmanCollection
    url: collections/kintsugi.postman_collection.json
  - type: OpenCollection
    url: collections/kintsugi.opencollection.json
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/syncing-transaction-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/transactions/create-transaction
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/product-customer-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/products/create-product
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/address-validation/search
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/nexus/get-nexus-for-org
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/exemptions/get-exemptions
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/exemptions/create-exemption
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/filings/get-filings
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/filings/get-filing-by-id
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/guides/integrating-kintsugis-api
- aid: kintsugi:kintsugi-customers-api
  name: Kintsugi Customers API
  description: Customer records and their transactions.
  humanURL: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  baseURL: https://api.trykintsugi.com/v1
  tags:
  - Customers
  properties:
  - type: OpenAPI
    url: openapi/kintsugi-customers-api-openapi.yml
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/tax-estimation/estimate-tax
  - type: PostmanCollection
    url: collections/kintsugi.postman_collection.json
  - type: OpenCollection
    url: collections/kintsugi.opencollection.json
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/syncing-transaction-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/transactions/create-transaction
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/product-customer-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/products/create-product
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/address-validation/search
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/nexus/get-nexus-for-org
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/exemptions/get-exemptions
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/exemptions/create-exemption
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/filings/get-filings
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/filings/get-filing-by-id
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/guides/integrating-kintsugis-api
- aid: kintsugi:kintsugi-exemptions-api
  name: Kintsugi Exemptions API
  description: Customer tax exemptions and certificates.
  humanURL: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  baseURL: https://api.trykintsugi.com/v1
  tags:
  - Exemptions
  properties:
  - type: OpenAPI
    url: openapi/kintsugi-exemptions-api-openapi.yml
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/tax-estimation/estimate-tax
  - type: PostmanCollection
    url: collections/kintsugi.postman_collection.json
  - type: OpenCollection
    url: collections/kintsugi.opencollection.json
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/syncing-transaction-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/transactions/create-transaction
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/product-customer-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/products/create-product
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/address-validation/search
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/nexus/get-nexus-for-org
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/exemptions/get-exemptions
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/exemptions/create-exemption
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/filings/get-filings
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/filings/get-filing-by-id
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/guides/integrating-kintsugis-api
- aid: kintsugi:kintsugi-filings-api
  name: Kintsugi Filings API
  description: Prepared and submitted sales tax returns.
  humanURL: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  baseURL: https://api.trykintsugi.com/v1
  tags:
  - Filings
  properties:
  - type: OpenAPI
    url: openapi/kintsugi-filings-api-openapi.yml
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/tax-estimation/estimate-tax
  - type: PostmanCollection
    url: collections/kintsugi.postman_collection.json
  - type: OpenCollection
    url: collections/kintsugi.opencollection.json
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/syncing-transaction-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/transactions/create-transaction
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/product-customer-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/products/create-product
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/address-validation/search
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/nexus/get-nexus-for-org
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/exemptions/get-exemptions
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/exemptions/create-exemption
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/filings/get-filings
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/filings/get-filing-by-id
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/guides/integrating-kintsugis-api
- aid: kintsugi:kintsugi-nexus-api
  name: Kintsugi Nexus API
  description: Physical and economic nexus tracking.
  humanURL: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  baseURL: https://api.trykintsugi.com/v1
  tags:
  - Nexus
  properties:
  - type: OpenAPI
    url: openapi/kintsugi-nexus-api-openapi.yml
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/tax-estimation/estimate-tax
  - type: PostmanCollection
    url: collections/kintsugi.postman_collection.json
  - type: OpenCollection
    url: collections/kintsugi.opencollection.json
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/syncing-transaction-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/transactions/create-transaction
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/product-customer-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/products/create-product
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/address-validation/search
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/nexus/get-nexus-for-org
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/exemptions/get-exemptions
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/exemptions/create-exemption
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/filings/get-filings
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/filings/get-filing-by-id
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/guides/integrating-kintsugis-api
- aid: kintsugi:kintsugi-products-api
  name: Kintsugi Products API
  description: Product records and taxability classification.
  humanURL: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  baseURL: https://api.trykintsugi.com/v1
  tags:
  - Product
  tags_raw:
  - Products
  properties:
  - type: OpenAPI
    url: openapi/kintsugi-products-api-openapi.yml
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/tax-estimation/estimate-tax
  - type: PostmanCollection
    url: collections/kintsugi.postman_collection.json
  - type: OpenCollection
    url: collections/kintsugi.opencollection.json
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/syncing-transaction-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/transactions/create-transaction
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/product-customer-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/products/create-product
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/address-validation/search
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/nexus/get-nexus-for-org
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/exemptions/get-exemptions
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/exemptions/create-exemption
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/filings/get-filings
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/filings/get-filing-by-id
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/guides/integrating-kintsugis-api
- aid: kintsugi:kintsugi-registrations-api
  name: Kintsugi Registrations API
  description: State tax registrations.
  humanURL: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  baseURL: https://api.trykintsugi.com/v1
  tags:
  - Registrations
  properties:
  - type: OpenAPI
    url: openapi/kintsugi-registrations-api-openapi.yml
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/tax-estimation/estimate-tax
  - type: PostmanCollection
    url: collections/kintsugi.postman_collection.json
  - type: OpenCollection
    url: collections/kintsugi.opencollection.json
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/syncing-transaction-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/transactions/create-transaction
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/product-customer-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/products/create-product
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/address-validation/search
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/nexus/get-nexus-for-org
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/exemptions/get-exemptions
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/exemptions/create-exemption
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/filings/get-filings
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/filings/get-filing-by-id
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/guides/integrating-kintsugis-api
- aid: kintsugi:kintsugi-tax-estimation-api
  name: Kintsugi Tax Estimation API
  description: Real-time sales tax, VAT, and GST estimation.
  humanURL: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  baseURL: https://api.trykintsugi.com/v1
  tags:
  - Tax Estimation
  properties:
  - type: OpenAPI
    url: openapi/kintsugi-tax-estimation-api-openapi.yml
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/tax-estimation/estimate-tax
  - type: PostmanCollection
    url: collections/kintsugi.postman_collection.json
  - type: OpenCollection
    url: collections/kintsugi.opencollection.json
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/syncing-transaction-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/transactions/create-transaction
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/product-customer-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/products/create-product
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/address-validation/search
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/nexus/get-nexus-for-org
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/exemptions/get-exemptions
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/exemptions/create-exemption
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/filings/get-filings
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/filings/get-filing-by-id
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/guides/integrating-kintsugis-api
- aid: kintsugi:kintsugi-transactions-api
  name: Kintsugi Transactions API
  description: Committed sales transactions and credit notes.
  humanURL: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  baseURL: https://api.trykintsugi.com/v1
  tags:
  - Transaction
  tags_raw:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/kintsugi-transactions-api-openapi.yml
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/sales-tax-calculations
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/tax-estimation/estimate-tax
  - type: PostmanCollection
    url: collections/kintsugi.postman_collection.json
  - type: OpenCollection
    url: collections/kintsugi.opencollection.json
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/syncing-transaction-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/transactions/create-transaction
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/api-guides/product-customer-records
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/products/create-product
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/address-validation/search
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/nexus/get-nexus-for-org
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/exemptions/get-exemptions
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/exemptions/create-exemption
  - type: Documentation
    url: https://docs.trykintsugi.com/reference/api/filings/get-filings
  - type: APIReference
    url: https://docs.trykintsugi.com/reference/api/filings/get-filing-by-id
  - type: Documentation
    url: https://docs.trykintsugi.com/docs/guides/integrating-kintsugis-api
common:
- type: AgenticAccess
  url: agentic-access/kintsugi-agentic-access.yml
- type: DomainSecurity
  url: security/kintsugi-domain-security.yml
- type: Authentication
  url: authentication/kintsugi-authentication.yml
- type: GitHubOrganization
  url: https://github.com/kintsugi-tax
- type: LinkedIn
  url: https://www.linkedin.com/company/trykintsugi
- type: Website
  url: https://www.trykintsugi.com
- type: Documentation
  url: https://docs.trykintsugi.com
- type: Plans
  url: plans/kintsugi-plans-pricing.yml
- type: RateLimits
  url: rate-limits/kintsugi-rate-limits.yml
- type: FinOps
  url: finops/kintsugi-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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