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 4 APIs on the APIs.io network, including Lookup V2 API, Onboarding API, Tax API, and 1 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 saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessPaidSelf serve

4 APIs

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

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 43.3/100 · developing

Contract Quality 13.4 / 23

Developer Ergonomics 4.3 / 18

Access Clarity 6.6 / 18

Operational Transparency 6.2 / 12

Contract Governance 0.0 / 11

Discoverability 6.7 / 9

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

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.

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

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