Kintsugi website screenshot

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
36.9/100 thin ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreemiumSelf serve⚡ Free to try
9 APIs
Sales TaxTax ComplianceTax AutomationVATGSTNexusAI

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 36.9/100 · thin
Contract Quality 14.3 / 25
Developer Ergonomics 3.9 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 3.4 / 13
Governance 0.0 / 12
Discoverability 7.4 / 10
Agent readiness — 31/100 · 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 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
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.

Kintsugi Address Validation API

Address search and suggestions for jurisdiction assignment.

Kintsugi Customers API

Customer records and their transactions.

Kintsugi Exemptions API

Customer tax exemptions and certificates.

Kintsugi Filings API

Prepared and submitted sales tax returns.

Kintsugi Nexus API

Physical and economic nexus tracking.

Kintsugi Products API

Product records and taxability classification.

Kintsugi Registrations API

State tax registrations.

Kintsugi Tax Estimation API

Real-time sales tax, VAT, and GST estimation.

Kintsugi Transactions API

Committed sales transactions and credit notes.

Scroll for all 9

Open Collections 1

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

Kintsugi Tax API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Kintsugi Plans Pricing

4 plans

PLANS

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.

Kintsugi Finops

FINOPS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Kintsugi Authentication

apiKey · 2 schemes

SECURITY

Kintsugi Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Kintsugi Agentic Access

39 operations · 17 acting

39 operations · 17 acting

AGENTIC

Resources

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
LinkedIn
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
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
- AI
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.19'
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:
  - 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:
  - 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