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 APIs 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.

Fonoa’s developer surface includes authentication, documentation, getting-started guide, changelog, engineering blog, and 15 more developer resources.

🌐 Visit website 📡 Source on GitHub

43.3/100 developing ▬ flat Agent 30/100 agent ready Front door AI 5/6 prominent saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

AccessPaidSelf serve

4 APIs

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

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 43.3/100 · developing

Contract Quality 10.6 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 5.2 / 15

Operational Transparency 4.8 / 10

Contract Governance 0.0 / 9

Discoverability 5.4 / 8

Regulatory Posture 4.1 / 15

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 30/100 · 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

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/.

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 github.com/api-evangelist/fonoa: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

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 5

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

API Collection

OPEN COLLECTION

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

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

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

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

disclosure policy published

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 2

Properties that don't map to a standard resource type

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
  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/fonoa.png
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: 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

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/fonoa"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/fonoa/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/fonoa/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

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