Vatstack

VAT number validation and EU tax rates REST API for validating European business VAT IDs via VIES and accessing current VAT rates for all EU member states. Vatstack provides automated VAT compliance for digital businesses including real-time VAT number validation, EU GST rate synchronization, price quotation engine, and automated VAT reporting for EC Sales List and VAT OSS requirements.

Vatstack publishes 7 API contracts indexed on the APIs.io network, including Batches API, Evidences API, Hits API, and 4 more. Tagged areas include VAT, Tax, Validation, EU, and Europe.

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

Vatstack’s developer surface includes authentication, documentation, engineering blog, pricing, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.0/100 thin ▬ flat Agent 20/100 agent aware Front door AI 1/6 silent Heartbeat 0/100 dormant saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

VAT Tax Validation EU Europe Compliance Finance Business

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Tax Management

BC-220

QuotesRatesValidations

GET /rates GET /rates/geolocate POST /validations POST /quotes

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 34.0/100 · thin

Contract Quality 10.3 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 2.2 / 15

Operational Transparency 3.2 / 10

Contract Governance 0.9 / 9

Discoverability 5.0 / 8

Regulatory Posture 3.4 / 15

Create-or-Update Ergonomics 0.0 / 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 Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 14.9 — up to +17.0 composite points Ask about this →
Developer Ergonomics scores 23.8 — up to +15.2 composite points Ask about this →
Contract Quality scores 55.0 — up to +11.3 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/vatstack/apis.yml: open an issue on github.com/api-evangelist/vatstack to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
E-invoicing and Tax Compliance (certified operators)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 7

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

Vatstack Batches API

The Batches API from Vatstack — 2 operation(s) for batches.

Vatstack Evidences API

The Evidences API from Vatstack — 2 operation(s) for evidences.

Vatstack Hits API

The Hits API from Vatstack — 1 operation(s) for hits.

Vatstack Quotes API

The Quotes API from Vatstack — 2 operation(s) for quotes.

Vatstack Rates API

The Rates API from Vatstack — 2 operation(s) for rates.

Vatstack Supplies API

The Supplies API from Vatstack — 2 operation(s) for supplies.

Vatstack Validations API

The Validations API from Vatstack — 2 operation(s) for validations.

OPEN COLLECTION

Scroll for all 7

Vatstack API pricing

Not yet checked against Vatstack's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Developer	Free
Small Business	$15
Enterprise	$150

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Vatstack Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Vatstack Rate Limits

8 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Vatstack

SLA

FinOps 1

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

Vatstack Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Vatstack Context

9 classes · 21 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Vatstack — jsonschema rules

5 rules · 4 warn-severity 1 info-severity

SPECTRAL

JSON Schema 8

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

Batch

security.txt · contact published

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Vatstack Agentic Access

23 operations · 10 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

GitHubOrg

GitHubOrg

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: vatstack
name: Vatstack
description: VAT number validation and EU tax rates REST API for validating European business VAT IDs via VIES and accessing
  current VAT rates for all EU member states. Vatstack provides automated VAT compliance for digital businesses including
  real-time VAT number validation, EU GST rate synchronization, price quotation engine, and automated VAT reporting for EC
  Sales List and VAT OSS requirements.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/vatstack.png
url: https://raw.githubusercontent.com/api-evangelist/vatstack/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
tags:
- VAT
- Tax
- Validation
- EU
- Europe
- Compliance
- Finance
- Business
apis:
- aid: vatstack:vatstack-batches-api
  name: Vatstack Batches API
  description: The Batches API from Vatstack — 2 operation(s) for batches.
  humanURL: https://vatstack.com/docs
  baseURL: https://api.vatstack.com/v1
  tags:
  - Batches
  properties:
  - type: OpenAPI
    url: openapi/vatstack-batches-api-openapi.yml
  - type: Documentation
    url: https://vatstack.com/docs
  - type: Authentication
    url: https://vatstack.com/docs/authentication
  - type: Pricing
    url: https://vatstack.com/pricing
  - type: Plans
    url: plans/vatstack-plans-pricing.yml
  - type: RateLimits
    url: rate-limits/vatstack-rate-limits.yml
  - type: FinOps
    url: finops/vatstack-finops.yml
- aid: vatstack:vatstack-evidences-api
  name: Vatstack Evidences API
  description: The Evidences API from Vatstack — 2 operation(s) for evidences.
  humanURL: https://vatstack.com/docs
  baseURL: https://api.vatstack.com/v1
  tags:
  - Evidences
  properties:
  - type: OpenAPI
    url: openapi/vatstack-evidences-api-openapi.yml
  - type: Documentation
    url: https://vatstack.com/docs
  - type: Authentication
    url: https://vatstack.com/docs/authentication
  - type: Pricing
    url: https://vatstack.com/pricing
  - type: Plans
    url: plans/vatstack-plans-pricing.yml
  - type: RateLimits
    url: rate-limits/vatstack-rate-limits.yml
  - type: FinOps
    url: finops/vatstack-finops.yml
- aid: vatstack:vatstack-hits-api
  name: Vatstack Hits API
  description: The Hits API from Vatstack — 1 operation(s) for hits.
  humanURL: https://vatstack.com/docs
  baseURL: https://api.vatstack.com/v1
  tags:
  - Hits
  properties:
  - type: OpenAPI
    url: openapi/vatstack-hits-api-openapi.yml
  - type: Documentation
    url: https://vatstack.com/docs
  - type: Authentication
    url: https://vatstack.com/docs/authentication
  - type: Pricing
    url: https://vatstack.com/pricing
  - type: Plans
    url: plans/vatstack-plans-pricing.yml
  - type: RateLimits
    url: rate-limits/vatstack-rate-limits.yml
  - type: FinOps
    url: finops/vatstack-finops.yml
- aid: vatstack:vatstack-quotes-api
  name: Vatstack Quotes API
  description: The Quotes API from Vatstack — 2 operation(s) for quotes.
  humanURL: https://vatstack.com/docs
  baseURL: https://api.vatstack.com/v1
  tags:
  - Quotes
  properties:
  - type: OpenAPI
    url: openapi/vatstack-quotes-api-openapi.yml
  - type: Documentation
    url: https://vatstack.com/docs
  - type: Authentication
    url: https://vatstack.com/docs/authentication
  - type: Pricing
    url: https://vatstack.com/pricing
  - type: Plans
    url: plans/vatstack-plans-pricing.yml
  - type: RateLimits
    url: rate-limits/vatstack-rate-limits.yml
  - type: FinOps
    url: finops/vatstack-finops.yml
- aid: vatstack:vatstack-rates-api
  name: Vatstack Rates API
  description: The Rates API from Vatstack — 2 operation(s) for rates.
  humanURL: https://vatstack.com/docs
  baseURL: https://api.vatstack.com/v1
  tags:
  - Rates
  properties:
  - type: OpenAPI
    url: openapi/vatstack-rates-api-openapi.yml
  - type: Documentation
    url: https://vatstack.com/docs
  - type: Authentication
    url: https://vatstack.com/docs/authentication
  - type: Pricing
    url: https://vatstack.com/pricing
  - type: Plans
    url: plans/vatstack-plans-pricing.yml
  - type: RateLimits
    url: rate-limits/vatstack-rate-limits.yml
  - type: FinOps
    url: finops/vatstack-finops.yml
- aid: vatstack:vatstack-supplies-api
  name: Vatstack Supplies API
  description: The Supplies API from Vatstack — 2 operation(s) for supplies.
  humanURL: https://vatstack.com/docs
  baseURL: https://api.vatstack.com/v1
  tags:
  - Supplies
  properties:
  - type: OpenAPI
    url: openapi/vatstack-supplies-api-openapi.yml
  - type: Documentation
    url: https://vatstack.com/docs
  - type: Authentication
    url: https://vatstack.com/docs/authentication
  - type: Pricing
    url: https://vatstack.com/pricing
  - type: Plans
    url: plans/vatstack-plans-pricing.yml
  - type: RateLimits
    url: rate-limits/vatstack-rate-limits.yml
  - type: FinOps
    url: finops/vatstack-finops.yml
- aid: vatstack:vatstack-validations-api
  name: Vatstack Validations API
  description: The Validations API from Vatstack — 2 operation(s) for validations.
  humanURL: https://vatstack.com/docs
  baseURL: https://api.vatstack.com/v1
  tags:
  - Validations
  properties:
  - type: OpenAPI
    url: openapi/vatstack-validations-api-openapi.yml
  - type: Documentation
    url: https://vatstack.com/docs
  - type: Authentication
    url: https://vatstack.com/docs/authentication
  - type: Pricing
    url: https://vatstack.com/pricing
  - type: Plans
    url: plans/vatstack-plans-pricing.yml
  - type: RateLimits
    url: rate-limits/vatstack-rate-limits.yml
  - type: FinOps
    url: finops/vatstack-finops.yml
common:
- type: CapabilityMap
  url: capabilities/vatstack-capability-edges.yml
  name: Vatstack Business Capability Map
- type: AgenticAccess
  url: agentic-access/vatstack-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/vatstack-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/vatstack-domain-security.yml
- type: Authentication
  url: authentication/vatstack-authentication.yml
- type: Website
  url: https://vatstack.com
- type: Documentation
  url: https://vatstack.com/docs
- type: GitHubOrg
  url: https://github.com/vatstack
- type: Blog
  url: https://vatstack.com/articles
- type: Pricing
  url: https://vatstack.com/pricing
- type: StatusPage
  url: https://status.vatstack.com
- type: X
  url: https://x.com/vatstack
- type: Plans
  url: plans/vatstack-plans-pricing.yml
- type: RateLimits
  url: rate-limits/vatstack-rate-limits.yml
- type: FinOps
  url: finops/vatstack-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Vatstack API — frequently asked questions

Does Vatstack have an API?

Yes. APIs.io lists 7 APIs from Vatstack, including Vatstack Batches API, Vatstack Evidences API and Vatstack Hits API, and 4 more.

Is there an OpenAPI specification for the Vatstack API?

Yes. APIs.io indexes 7 OpenAPI specifications for Vatstack, each linked for download from this page.

How do I authenticate with the Vatstack API?

Vatstack uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Vatstack Authentication.

How much does the Vatstack API cost?

APIs.io lists 3 pricing plans for Vatstack, with each plan's price, limits and inclusions under Pricing on this page.

Is the Vatstack API ready for AI agents?

Vatstack has a Kin Score of 34.0 out of 100 (thin) and an Agent Readiness score of 19.6 (agent-aware), scored by API Evangelist on 2026-11-13.

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