Zoho Invoice

Zoho Invoice is a cloud-based invoicing application for small businesses and freelancers that supports customer management, estimates, invoices, recurring billing, expense tracking, time tracking, and online payment collection. The Zoho Invoice REST API provides full CRUD access to organizations, contacts, items, invoices, estimates, credit notes, expenses, projects, time entries, and customer payments. Authentication uses OAuth 2.0 with region-specific data center domains (.com, .eu, .in, .com.au, .jp, .ca, .com.cn, .sa).

Zoho Invoice publishes 6 API contracts indexed on the APIs.io network, including Contacts API, Credit Notes API, Estimates API, and 3 more. Tagged areas include Invoicing, Accounting, Small Business, Billing, and Expense Tracking.

The Zoho Invoice catalog on APIs.io includes 1 Spectral governance ruleset.

Zoho Invoice’s developer surface includes documentation, pricing, signup flow, developer console, engineering blog, and 5 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

28.1/100 thin ▬ flat Agent 19/100 agent aware saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

1 published contract

Invoicing Accounting Small Business Billing Expense Tracking Software-as-a-Service

What this lets a business do 1

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

Financial Management

BC-200

Credit NotesInvoices

POST /invoices POST /invoices/{invoice_id}/email POST /invoices/{invoice_id}/payments POST /credit-notes

Kin Score

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

Composite quality — 28.1/100 · thin

Contract Quality 8.7 / 19

Developer Ergonomics 2.9 / 15

Access Clarity 2.9 / 15

Operational Transparency 1.4 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 1.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 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 0 / 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 →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author 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 →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →

10 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 19.0 — up to +16.2 composite points Ask about this →
Access Clarity scores 19.1 — up to +16.2 composite points Ask about this →
Contract Quality scores 46.3 — up to +13.4 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/zoho-invoice/apis.yml: open an issue on github.com/api-evangelist/zoho-invoice 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 →

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 6

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

Zoho Invoice API

REST API for managing organizations, contacts, items, invoices, estimates, credit notes, recurring invoices, expenses, projects, time entries, and customer payments. Authenticat...

Zoho Invoice Contacts API

The Contacts API from Zoho Invoice — 3 operation(s) for contacts.

Zoho Invoice Credit Notes API

The Credit Notes API from Zoho Invoice — 2 operation(s) for credit notes.

Zoho Invoice Estimates API

The Estimates API from Zoho Invoice — 2 operation(s) for estimates.

Zoho Invoice Invoices API

The Invoices API from Zoho Invoice — 6 operation(s) for invoices.

Zoho Invoice Organizations API

The Organizations API from Zoho Invoice — 1 operation(s) for organizations.

Open Collections 5

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

Zoho Invoice Contacts API

OPEN COLLECTION

Zoho Invoice Credit Notes API

OPEN COLLECTION

Zoho Invoice Estimates API

OPEN COLLECTION

Zoho Invoice Invoices API

OPEN COLLECTION

Zoho Invoice Organizations API

OPEN COLLECTION

Spectral Rules 1

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

Zoho Invoice API Rules

44 rules · 42 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 2

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

Zoho Invoice Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Zoho Invoice Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

Signup

Signup

Console

Console

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Commercial 1

Pricing, plans, and the legal terms of use

Pricing

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: zoho-invoice
name: Zoho Invoice
description: Zoho Invoice is a cloud-based invoicing application for small businesses and freelancers that supports customer
  management, estimates, invoices, recurring billing, expense tracking, time tracking, and online payment collection. The
  Zoho Invoice REST API provides full CRUD access to organizations, contacts, items, invoices, estimates, credit notes, expenses,
  projects, time entries, and customer payments. Authentication uses OAuth 2.0 with region-specific data center domains (.com,
  .eu, .in, .com.au, .jp, .ca, .com.cn, .sa).
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: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/zoho-invoice.png
tags:
- Invoicing
- Accounting
- Small Business
- Billing
- Expense Tracking
- Software-as-a-Service
tags_raw:
- Invoicing
- Accounting
- Small Business
- Billing
- Expense Tracking
- SaaS
url: https://raw.githubusercontent.com/api-evangelist/zoho-invoice/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-11'
specificationVersion: '0.23'
apis:
- aid: zoho-invoice:api
  name: Zoho Invoice API
  description: REST API for managing organizations, contacts, items, invoices, estimates, credit notes, recurring invoices,
    expenses, projects, time entries, and customer payments. Authentication is OAuth 2.0 with Organization ID header and region-specific
    data center domains.
  humanURL: https://www.zoho.com/invoice/api/v3/introduction
  baseURL: https://www.zohoapis.com/invoice/v3
  tags:
  - Invoicing
  - Billing
  - Accounting
  properties:
  - type: Documentation
    url: https://www.zoho.com/invoice/api/v3/introduction
  - type: OAuth Overview
    url: https://www.zoho.com/invoice/api/v3/oauth/
- aid: zoho-invoice:zoho-invoice-contacts-api
  name: Zoho Invoice Contacts API
  description: The Contacts API from Zoho Invoice — 3 operation(s) for contacts.
  humanURL: https://www.zoho.com/invoice/api/v3/introduction
  baseURL: https://www.zohoapis.com/invoice/v3
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/zoho-invoice-contacts-api-openapi.yml
- aid: zoho-invoice:zoho-invoice-credit-notes-api
  name: Zoho Invoice Credit Notes API
  description: The Credit Notes API from Zoho Invoice — 2 operation(s) for credit notes.
  humanURL: https://www.zoho.com/invoice/api/v3/introduction
  baseURL: https://www.zohoapis.com/invoice/v3
  tags:
  - Credit Notes
  properties:
  - type: OpenAPI
    url: openapi/zoho-invoice-credit-notes-api-openapi.yml
- aid: zoho-invoice:zoho-invoice-estimates-api
  name: Zoho Invoice Estimates API
  description: The Estimates API from Zoho Invoice — 2 operation(s) for estimates.
  humanURL: https://www.zoho.com/invoice/api/v3/introduction
  baseURL: https://www.zohoapis.com/invoice/v3
  tags:
  - Estimates
  properties:
  - type: OpenAPI
    url: openapi/zoho-invoice-estimates-api-openapi.yml
- aid: zoho-invoice:zoho-invoice-invoices-api
  name: Zoho Invoice Invoices API
  description: The Invoices API from Zoho Invoice — 6 operation(s) for invoices.
  humanURL: https://www.zoho.com/invoice/api/v3/introduction
  baseURL: https://www.zohoapis.com/invoice/v3
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/zoho-invoice-invoices-api-openapi.yml
- aid: zoho-invoice:zoho-invoice-organizations-api
  name: Zoho Invoice Organizations API
  description: The Organizations API from Zoho Invoice — 1 operation(s) for organizations.
  humanURL: https://www.zoho.com/invoice/api/v3/introduction
  baseURL: https://www.zohoapis.com/invoice/v3
  tags:
  - Organization
  tags_raw:
  - Organizations
  properties:
  - type: OpenAPI
    url: openapi/zoho-invoice-organizations-api-openapi.yml
common:
- type: CapabilityMap
  url: capabilities/zoho-invoice-capability-edges.yml
  name: Zoho Invoice Business Capability Map
- type: VulnerabilityDisclosure
  url: security/zoho-invoice-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/zoho-invoice-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/zoho
- type: Website
  url: https://www.zoho.com/invoice
- type: Documentation
  url: https://www.zoho.com/invoice/api/v3
- type: Pricing
  url: https://www.zoho.com/invoice/pricing.html
- type: Signup
  url: https://www.zoho.com/invoice/signup
- type: Console
  url: https://api-console.zoho.com
- url: https://www.zoho.com/invoice/blog/feed/
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-parent: zoho
x-relationship: product

Zoho Invoice API — frequently asked questions

Does Zoho Invoice have an API?

Yes. APIs.io lists 6 APIs from Zoho Invoice, including Zoho Invoice API, Zoho Invoice Contacts API and Zoho Invoice Credit Notes API, and 3 more.

Is there an OpenAPI specification for the Zoho Invoice API?

Yes. APIs.io indexes 5 OpenAPI specifications for Zoho Invoice, each linked for download from this page.

How do I authenticate with the Zoho Invoice API?

Zoho Invoice uses bearer-token authentication.

Is the Zoho Invoice API ready for AI agents?

Zoho Invoice has a Kin Score of 28.1 out of 100 (thin) and an Agent Readiness score of 18.9 (agent-aware), scored by API Evangelist on 2026-11-13.

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