Fonoa

Fonoa is a global indirect tax automation platform that connects the full indirect tax lifecycle on one platform, serving enterprises across 100+ countries and jurisdictions. The platform provides APIs for real-time tax ID validation across 120+ countries, VAT/GST and sales tax calculation, e-invoicing compliance with local mandates, transaction reporting, and automated multi-country tax return filing. Companies such as Zoom, Uber, Booking.com, and Remote.com rely on Fonoa to automate and manage their global indirect tax obligations through a single API integration.

Fonoa publishes 5 API contracts indexed on the APIs.io network, including Lookup V2 API, Onboarding API, Tax API, and 2 more. Tagged areas include Tax, VAT, GST, E-Invoicing, and Tax Automation.

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

Fonoa’s developer surface includes authentication, documentation, getting-started guide, changelog, engineering blog, and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

39.4/100 developing ▬ flat Agent 29/100 agent ready Front door AI 5/6 prominent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaidSelf serve

4 published contracts

Tax VAT GST E-Invoicing Tax Automation Tax Compliance Tax Calculation Tax ID ValidationInvoice GenerationGlobal TaxIndirect TaxFintech

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

Lookup V2TaxTransactions

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 39.4/100 · developing

Contract Quality 10.6 / 19

Developer Ergonomics 5.4 / 15

Access Clarity 2.0 / 15

Operational Transparency 2.1 / 10

Contract Governance 1.2 / 9

Discoverability 5.4 / 8

Regulatory Posture 4.1 / 15

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 29/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 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

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
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

6 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 13.2 — up to +17.4 composite points
Developer Ergonomics scores 35.7 — up to +12.9 composite points
Contract Quality scores 56.6 — up to +10.9 composite points

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.

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/fonoa/apis.yml: open an issue on github.com/api-evangelist/fonoa 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)	standard	64.5	-	1
PDF and Document Standards (PDF tooling, document signing trust, invoice documents)	standard	64.5	-	1

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 5

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

Fonoa Webhooks API

Webhooks management API for configuring real-time event notifications from Fonoa's platform. Recommended over polling for transaction status updates and e-invoicing compliance e...

Fonoa Lookup V2 API

The Lookup V2 API from Fonoa — 5 operation(s) for lookup v2.

Fonoa Onboarding API

The Onboarding API from Fonoa — 1 operation(s) for onboarding.

Fonoa Tax API

The Tax API from Fonoa — 1 operation(s) for tax.

Fonoa Transactions API

The Transactions API from Fonoa — 1 operation(s) for transactions.

Open Collections 4

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

Fonoa E-Invoicing Lookup V2 API

OPEN COLLECTION

Fonoa E-Invoicing Lookup V2 Onboarding API

OPEN COLLECTION

Fonoa E-Invoicing Lookup V2 Tax API

OPEN COLLECTION

Fonoa E-Invoicing Lookup V2 Transactions API

OPEN COLLECTION

Fonoa API pricing

Not yet checked against Fonoa's own pricing page. Compiled by API Evangelist on 2026-06-12; confirm before you rely on a figure.

Plan	Price
Enterprise enterprise	EUR 0.3 per document

Plan details, limits and sources →

Rate limits

: requests
: requests
: batch validations

Compiled by API Evangelist, not yet checked against Fonoa's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Fonoa Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Fonoa Rate Limits

3 limits

RATE LIMITS

Service Levels 1

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

Fonoa

SLA

FinOps 1

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

Fonoa Finops

FINOPS

Semantic Vocabularies 1

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

Fonoa Context

46 classes · 2 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Fonoa API Rules

58 rules · 53 errors 2 warnings 3 info

SPECTRAL

Security Posture 4

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

Fonoa Authentication

apiKey · 1 scheme

SECURITY

Fonoa Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Fonoa Vulnerability Disclosure

no policy recorded

SECURITY

Fonoa Trust Center

GDPR

SECURITY

Agentic Access 1

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

Fonoa Agentic Access

10 operations · 8 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

JSONLDContext

JSONLDContext

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 6

Authentication, authorization, and security posture

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

Authentication

Authentication

Security

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

Other 3

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Environments

Environments

Source (apis.yml)

aid: fonoa
name: Fonoa
description: 'Fonoa is a global indirect tax automation platform that connects the full indirect tax lifecycle on one platform,
  serving enterprises across 100+ countries and jurisdictions. The platform provides APIs for real-time tax ID validation
  across 120+ countries, VAT/GST and sales tax calculation, e-invoicing compliance with local mandates, transaction reporting,
  and automated multi-country tax return filing. Companies such as Zoom, Uber, Booking.com, and Remote.com rely on Fonoa to
  automate and manage their global indirect tax obligations through a single API integration.

  '
type: Index
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: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Paid · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/fonoa.png
x-docs-platform: readme
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-03
tags:
- Tax
- VAT
- GST
- E-Invoicing
- Tax Automation
- Tax Compliance
- Tax Calculation
- Tax ID Validation
- Invoice Generation
- Global Tax
- Indirect Tax
- Fintech
tags_raw:
- Tax
- VAT
- GST
- E-Invoicing
- Tax Automation
- Tax Compliance
- Tax Calculation
- Tax ID Validation
- Invoice Generation
- Global Tax
- Indirect Tax
- FinTech
url: https://raw.githubusercontent.com/api-evangelist/fonoa/refs/heads/main/apis.yml
created: '2026-06-12'
modified: '2026-06-12'
specificationVersion: '0.23'
apis:
- aid: fonoa:webhooks-api
  name: Fonoa Webhooks API
  description: 'Webhooks management API for configuring real-time event notifications from Fonoa''s platform. Recommended
    over polling for transaction status updates and e-invoicing compliance events.

    '
  humanURL: https://docs.fonoa.com/reference/welcome-to-fonoa
  baseURL: https://api.fonoa.com/webhooks
  tags:
  - Webhook
  - Event Notifications
  - Real-Time
  tags_raw:
  - Webhooks
  - Event Notifications
  - Real-Time
  properties:
  - type: Documentation
    url: https://docs.fonoa.com/reference/welcome-to-fonoa
- aid: fonoa:fonoa-lookup-v2-api
  name: Fonoa Lookup V2 API
  description: The Lookup V2 API from Fonoa — 5 operation(s) for lookup v2.
  humanURL: https://docs.fonoa.com/reference/instant-lookup
  baseURL: https://api.fonoa.com/validate
  tags:
  - Lookup V2
  properties:
  - type: OpenAPI
    url: openapi/fonoa-lookup-v2-api-openapi.yml
  - type: Documentation
    url: https://docs.fonoa.com/reference/instant-lookup
  - type: Documentation
    url: https://docs.fonoa.com/reference/welcome-to-fonoa
  - type: Documentation
    url: https://www.fonoa.com/platform/e-invoicing
  - type: Documentation
    url: https://docs.fonoa.com/reference/onboarding-v2
- aid: fonoa:fonoa-onboarding-api
  name: Fonoa Onboarding API
  description: The Onboarding API from Fonoa — 1 operation(s) for onboarding.
  humanURL: https://docs.fonoa.com/reference/instant-lookup
  baseURL: https://api.fonoa.com/validate
  tags:
  - Onboarding
  properties:
  - type: OpenAPI
    url: openapi/fonoa-onboarding-api-openapi.yml
  - type: Documentation
    url: https://docs.fonoa.com/reference/instant-lookup
  - type: Documentation
    url: https://docs.fonoa.com/reference/welcome-to-fonoa
  - type: Documentation
    url: https://www.fonoa.com/platform/e-invoicing
  - type: Documentation
    url: https://docs.fonoa.com/reference/onboarding-v2
- aid: fonoa:fonoa-tax-api
  name: Fonoa Tax API
  description: The Tax API from Fonoa — 1 operation(s) for tax.
  humanURL: https://docs.fonoa.com/reference/instant-lookup
  baseURL: https://api.fonoa.com/validate
  tags:
  - Tax
  properties:
  - type: OpenAPI
    url: openapi/fonoa-tax-api-openapi.yml
  - type: Documentation
    url: https://docs.fonoa.com/reference/instant-lookup
  - type: Documentation
    url: https://docs.fonoa.com/reference/welcome-to-fonoa
  - type: Documentation
    url: https://www.fonoa.com/platform/e-invoicing
  - type: Documentation
    url: https://docs.fonoa.com/reference/onboarding-v2
- aid: fonoa:fonoa-transactions-api
  name: Fonoa Transactions API
  description: The Transactions API from Fonoa — 1 operation(s) for transactions.
  humanURL: https://docs.fonoa.com/reference/instant-lookup
  baseURL: https://api.fonoa.com/validate
  tags:
  - Transaction
  tags_raw:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/fonoa-transactions-api-openapi.yml
  - type: Documentation
    url: https://docs.fonoa.com/reference/instant-lookup
  - type: Documentation
    url: https://docs.fonoa.com/reference/welcome-to-fonoa
  - type: Documentation
    url: https://www.fonoa.com/platform/e-invoicing
  - type: Documentation
    url: https://docs.fonoa.com/reference/onboarding-v2
common:
- type: CapabilityMap
  url: capabilities/fonoa-capability-edges.yml
  name: Fonoa Business Capability Map
- type: AgenticAccess
  url: agentic-access/fonoa-agentic-access.yml
- type: TrustCenter
  url: security/fonoa-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/fonoa-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/fonoa-domain-security.yml
- type: Authentication
  url: authentication/fonoa-authentication.yml
- type: Website
  url: https://www.fonoa.com
- type: Documentation
  url: https://docs.fonoa.com/reference/welcome-to-fonoa
- type: GettingStarted
  url: https://docs.fonoa.com/reference/getting-started-with-fonoa-api
- type: Authentication
  url: https://docs.fonoa.com/reference/api-authentication-overview
- type: Environments
  url: https://docs.fonoa.com/reference/environments
- type: ChangeLog
  url: https://docs.fonoa.com/reference/change-log
- type: Blog
  url: https://www.fonoa.com/resources/blog
- type: LinkedIn
  url: https://www.linkedin.com/company/fonoa
- type: X
  url: https://twitter.com/Fonoa_HQ
- type: GitHubOrganization
  url: https://github.com/Fonoa-Tech
- type: Security
  url: https://www.fonoa.com/resources/security
- type: Plans
  url: plans/fonoa-plans-pricing.yml
- type: RateLimits
  url: rate-limits/fonoa-rate-limits.yml
- type: FinOps
  url: finops/fonoa-finops.yml
- type: JSONLDContext
  url: json-ld/fonoa-context.jsonld
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Fonoa API — frequently asked questions

Does Fonoa have an API?

Yes. APIs.io lists 5 APIs from Fonoa, including Fonoa Webhooks API, Fonoa Lookup V2 API and Fonoa Onboarding API, and 2 more.

Is there an OpenAPI specification for the Fonoa API?

Yes. APIs.io indexes 4 OpenAPI specifications for Fonoa, each linked for download from this page.

How do I authenticate with the Fonoa API?

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

How much does the Fonoa API cost?

APIs.io lists 1 pricing plan for Fonoa, with each plan's price, limits and inclusions under Pricing on this page.

Is the Fonoa API ready for AI agents?

Fonoa has a Kin Score of 39.4 out of 100 (developing) and an Agent Readiness score of 29.4 (agent-ready), scored by API Evangelist on 2026-11-06.

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