Quaderno

Quaderno is a tax compliance, invoicing, and sales-tax / VAT automation platform. Its REST API calculates the correct sales tax, VAT, and GST in real time for any jurisdiction, then issues tax-compliant invoices, credit notes, estimates, and receipts. The account-scoped API (https://ACCOUNT_NAME.quadernoapp.com/api) covers contacts, items, invoices, credits, estimates, expenses, recurring documents, payments, unified sales transactions, hosted Checkout sessions, and webhooks, plus a tax engine for rate calculation, jurisdictions, tax codes, and tax ID validation. Requests use HTTP Basic Auth with a private API key and return JSON; every endpoint path ends in .json.

Quaderno publishes 14 API contracts indexed on the APIs.io network, including Authentication API, Checkout API, Contacts API, and 11 more. Tagged areas include Tax Compliance, Sales Tax, VAT, Invoicing, and Billing.

Quaderno’s developer surface includes authentication, documentation, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

27.2/100 thin ▬ flat Agent 21/100 agent aware Front door AI 2/6 trace saas Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

AccessFreemiumSelf serveFree trial⚡ Free to try

1 published contract

Tax Compliance Sales Tax VAT Invoicing Billing Fintech Tax

What this lets a business do 3

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

Financial Management

BC-200

CreditsInvoicesPayments

POST /credits.json POST /invoices.json GET /invoices/{id}/deliver.json POST /invoices/{id}/payments.json

Tax Management

BC-220

Taxes

GET /tax_rates/calculate.json GET /tax_ids/validate.json GET /tax_jurisdictions.json

Customer Relationship Management

BC-420

Contacts

GET /contacts.json POST /contacts.json

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 27.2/100 · thin

Contract Quality 9.6 / 19

Developer Ergonomics 4.5 / 15

Access Clarity 1.2 / 15

Operational Transparency 1.0 / 10

Contract Governance 0.0 / 9

Discoverability 5.0 / 8

Regulatory Posture 1.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 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 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

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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/quaderno/"><img src="https://apis.io/badge/quaderno/card.svg" alt="Quaderno on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

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/quaderno: 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 →

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
Commerce Platform Ecosystems (Shopify, WooCommerce, Stripe Apps)	undeclared	-	-	-
E-invoicing and Tax Compliance (certified operators)	undeclared	-	-	-
Stripe App Marketplace and Partner Ecosystem (builders on Stripe)	undeclared	-	-	-
Amazon Seller Ecosystem (Selling Partner Appstore, Amazon Ads partners)	undeclared	-	-	-
Xero App Store (SMB finance, payroll, inventory and invoicing apps built on Xero, by region)	undeclared	-	-	-

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 14

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

Quaderno Authentication API

Ping the API and inspect the authenticated account and rate-limit state.

Quaderno Checkout API

Hosted checkout sessions for collecting tax-compliant payments.

Quaderno Contacts API

Customers and vendors.

Quaderno Credits API

Credit notes issued against invoices.

Quaderno Estimates API

Quotes and estimates issued to customers.

Quaderno Evidences API

Location evidence records supporting tax determination for a transaction.

Quaderno Expenses API

Purchases and vendor bills recorded against the account.

Quaderno Invoices API

Sales invoices issued to customers.

Quaderno Items API

Reusable products and services used as document line items.

Quaderno Payments API

Payments recorded against invoices, credits, and expenses.

Quaderno Recurring API

Recurring document templates that auto-generate invoices.

Quaderno Taxes API

Real-time tax rate calculation, jurisdictions, tax codes, and tax ID validation.

Quaderno Transactions API

Unified sales transactions that both record a sale and calculate tax.

Quaderno Webhooks API

Subscriptions that deliver real-time event notifications to your app.

Scroll for all 14

Open Collections 15

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

Quaderno Authentication API

OPEN COLLECTION

Quaderno Authentication Checkout API

OPEN COLLECTION

Quaderno Authentication Contacts API

OPEN COLLECTION

Quaderno Authentication Credits API

OPEN COLLECTION

Quaderno Authentication Estimates API

OPEN COLLECTION

Quaderno Authentication Evidences API

OPEN COLLECTION

Quaderno Authentication Expenses API

OPEN COLLECTION

Quaderno Authentication Invoices API

OPEN COLLECTION

Quaderno Authentication Items API

OPEN COLLECTION

Quaderno Authentication Payments API

OPEN COLLECTION

Quaderno Authentication Recurring API

OPEN COLLECTION

Quaderno Authentication Taxes API

OPEN COLLECTION

Quaderno Authentication Transactions API

OPEN COLLECTION

Quaderno Authentication Webhooks API

OPEN COLLECTION

Quaderno API

OPEN COLLECTION

Scroll for all 15

Pricing Plans 1

Published pricing tiers and plan structures.

Quaderno Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Quaderno Rate Limits

3 limits

RATE LIMITS

FinOps 1

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

Quaderno Finops

FINOPS

Security Posture 2

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

Quaderno Authentication

http · 1 scheme

SECURITY

Quaderno Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Quaderno Agentic Access

53 operations · 28 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

BlogRSS

BlogRSS

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: quaderno
url: https://raw.githubusercontent.com/api-evangelist/quaderno/refs/heads/main/apis.yml
name: Quaderno
kind: company
description: Quaderno is a tax compliance, invoicing, and sales-tax / VAT automation platform. Its REST API calculates the
  correct sales tax, VAT, and GST in real time for any jurisdiction, then issues tax-compliant invoices, credit notes, estimates,
  and receipts. The account-scoped API (https://ACCOUNT_NAME.quadernoapp.com/api) covers contacts, items, invoices, credits,
  estimates, expenses, recurring documents, payments, unified sales transactions, hosted Checkout sessions, and webhooks,
  plus a tax engine for rate calculation, jurisdictions, tax codes, and tax ID validation. Requests use HTTP Basic Auth with
  a private API key and return JSON; every endpoint path ends in .json.
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: freemium
  onboarding: self-serve
  trial: true
  try_now: true
  public: false
  label: Freemium (free trial) · 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/quaderno.png
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- Tax Compliance
- Sales Tax
- VAT
- Invoicing
- Billing
- Fintech
- Tax
tags_raw:
- Tax Compliance
- Sales Tax
- VAT
- Invoicing
- Billing
- FinTech
- Tax
created: '2026-07-03'
modified: '2026-10-06'
specificationVersion: '0.23'
apis:
- aid: quaderno:quaderno-authentication-api
  name: Quaderno Authentication API
  description: Ping the API and inspect the authenticated account and rate-limit state.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/quaderno-authentication-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-checkout-api
  name: Quaderno Checkout API
  description: Hosted checkout sessions for collecting tax-compliant payments.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Checkout
  properties:
  - type: OpenAPI
    url: openapi/quaderno-checkout-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-contacts-api
  name: Quaderno Contacts API
  description: Customers and vendors.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/quaderno-contacts-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-credits-api
  name: Quaderno Credits API
  description: Credit notes issued against invoices.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Credit
  tags_raw:
  - Credits
  properties:
  - type: OpenAPI
    url: openapi/quaderno-credits-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-estimates-api
  name: Quaderno Estimates API
  description: Quotes and estimates issued to customers.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Estimates
  properties:
  - type: OpenAPI
    url: openapi/quaderno-estimates-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-evidences-api
  name: Quaderno Evidences API
  description: Location evidence records supporting tax determination for a transaction.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Evidences
  properties:
  - type: OpenAPI
    url: openapi/quaderno-evidences-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-expenses-api
  name: Quaderno Expenses API
  description: Purchases and vendor bills recorded against the account.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Expenses
  properties:
  - type: OpenAPI
    url: openapi/quaderno-expenses-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-invoices-api
  name: Quaderno Invoices API
  description: Sales invoices issued to customers.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/quaderno-invoices-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-items-api
  name: Quaderno Items API
  description: Reusable products and services used as document line items.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Item
  tags_raw:
  - Items
  properties:
  - type: OpenAPI
    url: openapi/quaderno-items-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-payments-api
  name: Quaderno Payments API
  description: Payments recorded against invoices, credits, and expenses.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Payments
  properties:
  - type: OpenAPI
    url: openapi/quaderno-payments-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-recurring-api
  name: Quaderno Recurring API
  description: Recurring document templates that auto-generate invoices.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Recurring
  properties:
  - type: OpenAPI
    url: openapi/quaderno-recurring-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-taxes-api
  name: Quaderno Taxes API
  description: Real-time tax rate calculation, jurisdictions, tax codes, and tax ID validation.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Tax
  tags_raw:
  - Taxes
  properties:
  - type: OpenAPI
    url: openapi/quaderno-taxes-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-transactions-api
  name: Quaderno Transactions API
  description: Unified sales transactions that both record a sale and calculate tax.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Transaction
  tags_raw:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/quaderno-transactions-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
- aid: quaderno:quaderno-webhooks-api
  name: Quaderno Webhooks API
  description: Subscriptions that deliver real-time event notifications to your app.
  humanURL: https://developers.quaderno.io/api/
  baseURL: https://ACCOUNT_NAME.quadernoapp.com/api
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/quaderno-webhooks-api-openapi.yml
  - type: Documentation
    url: https://developers.quaderno.io/api/
  - type: APIReference
    url: https://developers.quaderno.io/api/
  - type: PostmanCollection
    url: collections/quaderno.postman_collection.json
  - type: OpenCollection
    url: collections/quaderno.opencollection.json
  - type: Documentation
    url: https://developers.quaderno.io/guides/checkout/
  - type: Documentation
    url: https://developers.quaderno.io/guides/webhooks/
common:
- url: https://quaderno.io/rss.xml
  type: BlogRSS
- type: CapabilityMap
  url: capabilities/quaderno-capability-edges.yml
  name: Quaderno Business Capability Map
- type: AgenticAccess
  url: agentic-access/quaderno-agentic-access.yml
- type: DomainSecurity
  url: security/quaderno-domain-security.yml
- type: Authentication
  url: authentication/quaderno-authentication.yml
- type: GitHubOrganization
  url: https://github.com/quaderno
- type: LinkedIn
  url: https://www.linkedin.com/company/quaderno
- type: Website
  url: https://quaderno.io
- type: Documentation
  url: https://developers.quaderno.io
- type: Plans
  url: plans/quaderno-plans-pricing.yml
- type: RateLimits
  url: rate-limits/quaderno-rate-limits.yml
- type: FinOps
  url: finops/quaderno-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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