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Quaderno for AI agents

Quaderno automates tax calculations, invoicing, and compliance reporting for businesses selling internationally. Finance teams use it to stay compliant with tax rules across regions. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect QuadernoSee the 76 actions ↓
Finance and accountingAPI keyMCP + RESTquaderno.io
AUDIT LOG · QUADERNOPOLICY: acme-support
09:41:07 · claude · u_8f2read
quaderno.list_coupons
List Coupons✓ allowed · 212ms
09:41:08 · claude · u_8f2read
quaderno.get_estimate
Get Estimate✓ allowed · 164ms
09:41:09 · claude · u_8f2write
quaderno.create_coupon
Create Coupon✓ approved · approved by user
09:41:12 · claude · u_8f2destructive
quaderno.delete_coupon
Delete Coupon✕ blocked · policy: deny
EVERY QUADERNO CALL, ON THE RECORD
01 · USE CASES

What agents do in Quaderno.

01

Create an invoice for a sale

Generate a tax-compliant invoice for a transaction with the correct rate applied.

02

Check a tax rate read-only

Calculate the applicable tax rate for a customer's location before finalizing a price.

03

Delete a product with approval

Remove a product from the catalog only after finance confirms it is discontinued.

02 · ACTIONS

76 Quaderno actions, graded by risk.

Every Quaderno action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

35

Look things up. Allowed by default.

  • quaderno.get_estimate
    Get Estimate
  • quaderno.list_coupons
    List Coupons
  • quaderno.list_credits
    List Credits
  • quaderno.list_contacts
    List Contacts
  • quaderno.list_evidence
    List Evidence
  • quaderno.list_expenses
    List Expenses
  • quaderno.list_invoices
    List Invoices
  • quaderno.list_products
    List Products
  • quaderno.list_receipts
    List Receipts
  • quaderno.list_sessions
    List Sessions
  • quaderno.list_webhooks
    List Webhooks
  • quaderno.list_estimates
    List Estimates
  • quaderno.list_tax_codes
    List Tax Codes
  • quaderno.list_recurrings
    List Recurrings
  • quaderno.get_authorization
    Get Authorization
  • quaderno.list_jurisdictions
    List Tax Jurisdictions
+ 19 MORE

write

31

Create and change things. Allow, or ask the user first.

  • quaderno.create_coupon
    Create Coupon
  • quaderno.create_tax_id
    Create Tax ID
  • quaderno.update_coupon
    Update Coupon
  • quaderno.update_tax_id
    Update Tax ID
  • quaderno.create_contact
    Create Contact
  • quaderno.create_expense
    Create Expense
  • quaderno.create_invoice
    Create Invoice
  • quaderno.create_product
    Create Product
  • quaderno.create_receipt
    Create Receipt
  • quaderno.create_webhook
    Create Webhook
  • quaderno.update_contact
    Update Contact
  • quaderno.update_expense
    Update Expense
  • quaderno.update_invoice
    Update Invoice
  • quaderno.update_product
    Update product
  • quaderno.update_webhook
    Update Webhook
  • quaderno.create_estimate
    Create Estimate
+ 15 MORE

destructive

10

Delete, cancel or archive. Ask first, or deny outright.

  • quaderno.delete_coupon
    Delete Coupon
  • quaderno.delete_tax_id
    Delete Tax ID
  • quaderno.delete_contact
    Delete Contact
  • quaderno.delete_expense
    Delete Expense
  • quaderno.delete_product
    Delete Product
  • quaderno.delete_webhook
    Delete Webhook
  • quaderno.delete_estimate
    Delete Estimate
  • quaderno.delete_recurring
    Delete Recurring
  • quaderno.remove_invoice_payment
    Remove Invoice Payment
  • quaderno.void_credit_note
    Void Credit Note
03 · HOW IT WORKS

Quaderno in three steps.

  1. 01Your users connect QuadernoThey add their Quaderno api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, writes like “create Coupon” can wait for the user, and “delete Coupon” can be denied outright.
  3. 03Any agent can actYour agent calls Quaderno through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
POLICY.TS
await arc0.policies.set('quaderno', {
  read: 'allow',
  write: 'ask',        // create_coupon
  destructive: 'deny',  // delete_coupon
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2
04 · AUTH AND DATA

How Quaderno connects.

Users add their Quaderno api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same Quaderno connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH
API key
CREDENTIALS
Per-tenant encrypted vault
MODEL SEES
Results only, never credentials
AUDIT LOG
Every call, on every plan
05 · WORKS WITH

Use Quaderno from any agent.

Claude
ChatGPT
Cursor
Codex
VS Code
OpenAI Agents SDK
Claude Agent SDK
Vercel AI SDK
Mastra
LangGraph
06 · RELATED

More finance and accounting apps.

Stripe433 actions44API4 actionsAirwallex7 actionsAiwyn Tax10 actionsAltoviz67 actionsCoupa384 actionsZoho Books265 actionsMaxio177 actions
ALL FINANCE AND ACCOUNTING APPS →
07 · FAQ

Quaderno and Arc0, answered.

Q01

Can I use Quaderno with Claude, ChatGPT or Cursor?

Yes. Connect Quaderno to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Quaderno actions you allow.

Q02

How do users connect Quaderno?

Users add their Quaderno api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which Quaderno actions can my agent take?

76 in total: 35 read, 31 write and 10 destructive, such as “create Coupon”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Quaderno?

Yes. Actions like “delete Coupon” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call Quaderno too?

Yes. The same Quaderno connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Quaderno into your agent.

Your users connect Quaderno once, under your brand. Your agent gets 76 actions behind your policies, with every call on the record.

Connect QuadernoBrowse all apps →

Free to build · MCP + REST · Audit log on every plan