AppZen

AppZen is an AI platform for finance teams that automates accounts payable and expense auditing. Its Autonomous AP product ingests invoices, purchase orders, goods receipts and supporting master data, then applies AI to run validation checks, assign risk scores, and audit spend before payment. The public Autonomous AP REST API (Swagger 2.0, 54 operations) lets ERP and accounting systems such as SAP, Oracle, NetSuite, Coupa, Workday and Microsoft Dynamics push documents into AppZen and retrieve audit results. Authentication is via three API-key headers issued by AppZen Support, with US sandbox and production environments (EU coming soon).

AppZen publishes 19 API contracts indexed on the APIs.io network, including Chart of Accounts API, Custom Data Sets API, Documents API, and 16 more. Tagged areas include Company, Finance, Accounts Payable, Expense Management, and Invoice Processing.

AppZen’s developer surface includes authentication, sandbox, documentation, API reference, getting-started guide, support, engineering blog, and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

36.9/100 thin ▬ flat Agent 21/100 agent aware Front door AI 6/6 dominant saas Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 3 Agent Skills

Company Finance Accounts Payable Expense Management Invoice ProcessingSpend AuditArtificial Intelligence ERP Integration

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

Chart Of AccountsExternally Processed InvoicesInvoice Audit ResultsInvoice Status SyncInvoicesProcessed Invoices

POST /invoice/externally-processed POST /invoice/externally-processed-for-audit POST /invoice POST /chart-of-accounts

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 36.9/100 · thin

Contract Quality 9.5 / 21

Developer Ergonomics 11.2 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.5 / 10

Discoverability 5.6 / 9

Regulatory Posture 3.4 / 15

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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 0 / 5

Distinct Operations 0 / 3

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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Raise your score.

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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

11 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 21.1 — up to +15.8 composite points
Contract Quality scores 44.7 — up to +13.8 composite points
Operational Transparency scores 0.0 — up to +13.0 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/appzen/apis.yml: open an issue on github.com/api-evangelist/appzen 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
PDF and Document Standards (PDF tooling, document signing trust, invoice documents)	builds-on	26.8 (thin)	-	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.

APIs 19

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

AppZen Chart of Accounts API

The Chart of Accounts API from AppZen — 3 operation(s) for chart of accounts.

AppZen Custom Data Sets API

The Custom Data Sets API from AppZen — 3 operation(s) for custom data sets.

AppZen Documents API

The Documents API from AppZen — 1 operation(s) for documents.

AppZen Entities API

The Entities API from AppZen — 4 operation(s) for entities.

AppZen Externally Processed Invoices API

The Externally Processed Invoices API from AppZen — 2 operation(s) for externally processed invoices.

AppZen Goods Receipt API

The Goods Receipt API from AppZen — 2 operation(s) for goods receipt.

AppZen Invoice Audit Results API

The Invoice Audit Results API from AppZen — 2 operation(s) for invoice audit results.

AppZen Invoice Status Sync API

The Invoice Status Sync API from AppZen — 1 operation(s) for invoice status sync.

AppZen Invoices API

The Invoices API from AppZen — 3 operation(s) for invoices.

AppZen Lookup Item API

The Lookup Item API from AppZen — 3 operation(s) for lookup item.

AppZen Lookup Table API

The Lookup Table API from AppZen — 3 operation(s) for lookup table.

AppZen Payment Terms API

The Payment Terms API from AppZen — 4 operation(s) for payment terms.

AppZen Processed Invoices API

The Processed Invoices API from AppZen — 1 operation(s) for processed invoices.

AppZen Purchase Orders API

The Purchase Orders API from AppZen — 4 operation(s) for purchase orders.

AppZen Suppliers API

The Suppliers API from AppZen — 4 operation(s) for suppliers.

AppZen Tax Master API

The Tax Master API from AppZen — 3 operation(s) for tax master.

AppZen Unit of Measures API

The Unit of Measures API from AppZen — 3 operation(s) for unit of measures.

AppZen User Groups API

The User Groups API from AppZen — 3 operation(s) for user groups.

AppZen Vat API

The Vat API from AppZen — 4 operation(s) for vat.

Scroll for all 19

Open Collections 19

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

Autonomous AP APIs Chart of Accounts API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Custom Data Sets API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Documents API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Entities API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Externally Processed Invoices API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Goods Receipt API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Invoice Audit Results API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Invoice Status Sync API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Invoices API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Lookup Item API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Lookup Table API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Payment Terms API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Processed Invoices API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Purchase Orders API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Suppliers API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Tax Master API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Unit of Measures API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts User Groups API

OPEN COLLECTION

Autonomous AP APIs Chart of Accounts Vat API

OPEN COLLECTION

Scroll for all 19

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

Send an externally-processed invoice to AppZen for audit

AGENT SKILL

Submit an invoice to AppZen for automated audit

AGENT SKILL

Sync AppZen master data

AGENT SKILL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Appzen Autonomous Ap Overlay

1 action · update · appzen-autonomous-ap-openapi-original.yml

DERIVED

Security Posture 2

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

Appzen Authentication

apiKey · 3 schemes

SECURITY

Appzen Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

Sandbox

Sandbox

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

DataModel

Conformance

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

BlogRSS

BlogRSS

Blog

Blog

Website

Website

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

aid: appzen
name: AppZen
description: AppZen is an AI platform for finance teams that automates accounts payable and expense auditing. Its Autonomous
  AP product ingests invoices, purchase orders, goods receipts and supporting master data, then applies AI to run validation
  checks, assign risk scores, and audit spend before payment. The public Autonomous AP REST API (Swagger 2.0, 54 operations)
  lets ERP and accounting systems such as SAP, Oracle, NetSuite, Coupa, Workday and Microsoft Dynamics push documents into
  AppZen and retrieve audit results. Authentication is via three API-key headers issued by AppZen Support, with US sandbox
  and production environments (EU coming soon).
url: https://raw.githubusercontent.com/api-evangelist/appzen/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
- bloomberg-beta
- lightspeed-venture-partners
- redpoint-ventures
x-tier: enriched
x-tier-reason: portfolio-lead
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  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:
  - authentication
  - security
  - sandbox
  generated: '2026-09-03'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
image: https://api-docs.appzen.com/img/appzen-logo.svg
tags:
- Company
- Finance
- Accounts Payable
- Expense Management
- Invoice Processing
- Spend Audit
- Artificial Intelligence
- ERP Integration
apis:
- aid: appzen:appzen-chart-of-accounts-api
  name: AppZen Chart of Accounts API
  description: The Chart of Accounts API from AppZen — 3 operation(s) for chart of accounts.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Chart of Accounts
  properties:
  - type: OpenAPI
    url: openapi/appzen-chart-of-accounts-api-openapi.yml
- aid: appzen:appzen-custom-data-sets-api
  name: AppZen Custom Data Sets API
  description: The Custom Data Sets API from AppZen — 3 operation(s) for custom data sets.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Custom Data Sets
  properties:
  - type: OpenAPI
    url: openapi/appzen-custom-data-sets-api-openapi.yml
- aid: appzen:appzen-documents-api
  name: AppZen Documents API
  description: The Documents API from AppZen — 1 operation(s) for documents.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Documents
  properties:
  - type: OpenAPI
    url: openapi/appzen-documents-api-openapi.yml
- aid: appzen:appzen-entities-api
  name: AppZen Entities API
  description: The Entities API from AppZen — 4 operation(s) for entities.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Entities
  properties:
  - type: OpenAPI
    url: openapi/appzen-entities-api-openapi.yml
- aid: appzen:appzen-externally-processed-invoices-api
  name: AppZen Externally Processed Invoices API
  description: The Externally Processed Invoices API from AppZen — 2 operation(s) for externally processed invoices.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Externally Processed Invoices
  properties:
  - type: OpenAPI
    url: openapi/appzen-externally-processed-invoices-api-openapi.yml
- aid: appzen:appzen-goods-receipt-api
  name: AppZen Goods Receipt API
  description: The Goods Receipt API from AppZen — 2 operation(s) for goods receipt.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Goods Receipt
  properties:
  - type: OpenAPI
    url: openapi/appzen-goods-receipt-api-openapi.yml
- aid: appzen:appzen-invoice-audit-results-api
  name: AppZen Invoice Audit Results API
  description: The Invoice Audit Results API from AppZen — 2 operation(s) for invoice audit results.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Invoice Audit Results
  properties:
  - type: OpenAPI
    url: openapi/appzen-invoice-audit-results-api-openapi.yml
- aid: appzen:appzen-invoice-status-sync-api
  name: AppZen Invoice Status Sync API
  description: The Invoice Status Sync API from AppZen — 1 operation(s) for invoice status sync.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Invoice Status Sync
  properties:
  - type: OpenAPI
    url: openapi/appzen-invoice-status-sync-api-openapi.yml
- aid: appzen:appzen-invoices-api
  name: AppZen Invoices API
  description: The Invoices API from AppZen — 3 operation(s) for invoices.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/appzen-invoices-api-openapi.yml
- aid: appzen:appzen-lookup-item-api
  name: AppZen Lookup Item API
  description: The Lookup Item API from AppZen — 3 operation(s) for lookup item.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Lookup Item
  properties:
  - type: OpenAPI
    url: openapi/appzen-lookup-item-api-openapi.yml
- aid: appzen:appzen-lookup-table-api
  name: AppZen Lookup Table API
  description: The Lookup Table API from AppZen — 3 operation(s) for lookup table.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Lookup Table
  properties:
  - type: OpenAPI
    url: openapi/appzen-lookup-table-api-openapi.yml
- aid: appzen:appzen-payment-terms-api
  name: AppZen Payment Terms API
  description: The Payment Terms API from AppZen — 4 operation(s) for payment terms.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Payment Terms
  properties:
  - type: OpenAPI
    url: openapi/appzen-payment-terms-api-openapi.yml
- aid: appzen:appzen-processed-invoices-api
  name: AppZen Processed Invoices API
  description: The Processed Invoices API from AppZen — 1 operation(s) for processed invoices.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Processed Invoices
  properties:
  - type: OpenAPI
    url: openapi/appzen-processed-invoices-api-openapi.yml
- aid: appzen:appzen-purchase-orders-api
  name: AppZen Purchase Orders API
  description: The Purchase Orders API from AppZen — 4 operation(s) for purchase orders.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Purchase Orders
  properties:
  - type: OpenAPI
    url: openapi/appzen-purchase-orders-api-openapi.yml
- aid: appzen:appzen-suppliers-api
  name: AppZen Suppliers API
  description: The Suppliers API from AppZen — 4 operation(s) for suppliers.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Suppliers
  properties:
  - type: OpenAPI
    url: openapi/appzen-suppliers-api-openapi.yml
- aid: appzen:appzen-tax-master-api
  name: AppZen Tax Master API
  description: The Tax Master API from AppZen — 3 operation(s) for tax master.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Tax Master
  properties:
  - type: OpenAPI
    url: openapi/appzen-tax-master-api-openapi.yml
- aid: appzen:appzen-unit-of-measures-api
  name: AppZen Unit of Measures API
  description: The Unit of Measures API from AppZen — 3 operation(s) for unit of measures.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - Unit of Measures
  properties:
  - type: OpenAPI
    url: openapi/appzen-unit-of-measures-api-openapi.yml
- aid: appzen:appzen-user-groups-api
  name: AppZen User Groups API
  description: The User Groups API from AppZen — 3 operation(s) for user groups.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - User Groups
  properties:
  - type: OpenAPI
    url: openapi/appzen-user-groups-api-openapi.yml
- aid: appzen:appzen-vat-api
  name: AppZen Vat API
  description: The Vat API from AppZen — 4 operation(s) for vat.
  humanURL: https://api-docs.appzen.com/
  baseURL: https://api.appzen.com/dictionary-data-services
  tags:
  - VAT
  tags_raw:
  - Vat
  properties:
  - type: OpenAPI
    url: openapi/appzen-vat-api-openapi.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://www.appzen.com/blog/rss.xml
  type: BlogRSS
- type: CapabilityMap
  url: capabilities/appzen-capability-edges.yml
  name: AppZen Business Capability Map
- type: Overlay
  url: overlays/appzen-autonomous-ap-overlay.yaml
- type: DomainSecurity
  url: security/appzen-domain-security.yml
- type: Authentication
  url: authentication/appzen-authentication.yml
- type: Conventions
  url: conventions/appzen-conventions.yml
- type: ErrorCatalog
  url: errors/appzen-problem-types.yml
- type: Lifecycle
  url: lifecycle/appzen-lifecycle.yml
- type: Sandbox
  url: sandbox/appzen-sandbox.yml
- type: DataModel
  url: data-model/appzen-data-model.yml
- type: Conformance
  url: conformance/appzen-conformance.yml
- type: X-MCPServerCandidate
  url: mcp/appzen-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/appzen-llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: DeveloperPortal
  url: https://api-docs.appzen.com/
- type: Documentation
  url: https://support.appzen.com/hc/en-us/categories/13996913056659-AppZen-REST-API
- type: APIReference
  url: https://api-docs.appzen.com/swagger/apis.html
- type: GettingStarted
  url: https://support.appzen.com/hc/en-us/articles/12682580110739-Introduction
- type: Support
  url: https://support.appzen.com/
- type: Blog
  url: https://www.appzen.com/blog
- type: TermsOfService
  url: https://www.appzen.com/terms-of-service
- type: PrivacyPolicy
  url: https://www.appzen.com/privacy-policy-appzen
- type: Website
  url: https://appzen.com
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

AppZen API — frequently asked questions

Does AppZen have an API?

Yes. APIs.io lists 19 APIs from AppZen, including AppZen Chart of Accounts API, AppZen Custom Data Sets API and AppZen Documents API, and 16 more.

Is there an OpenAPI specification for the AppZen API?

Yes. APIs.io indexes 19 OpenAPI specifications for AppZen, each linked for download from this page.

How do I authenticate with the AppZen API?

AppZen uses bearer-token authentication (apiKey · 3 schemes). The details are profiled on APIs.io as Appzen Authentication.

Is the AppZen API ready for AI agents?

AppZen has a Kin Score of 36.9 out of 100 (thin) and an Agent Readiness score of 20.9 (agent-aware), scored by API Evangelist on 2026-10-31.

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