Quaderno MCP Server

by usefulapi Your server? Claim it

answering

Quaderno is answering right now. Last checked 12 min ago. It exposes 23 tools. Last commit 1 Sep 2026.

MCP server for Quaderno — tax-rate calculation, invoices, contacts, products, receipts & expenses.

Uptime history 47 days of history · worst day 15%

47 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

174 ms

Response time

average over 24h

Stars

last commit 1 Sep 2026

Nothing serious here today

Today is the operative word: we check Quaderno every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 12 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add quaderno --transport http https://quaderno.usefulapi.io/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "quaderno": {
      "url": "https://quaderno.usefulapi.io/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.quaderno]
url = "https://quaderno.usefulapi.io/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "quaderno": {
      "url": "https://quaderno.usefulapi.io/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "quaderno": {
      "url": "https://quaderno.usefulapi.io/mcp"
    }
  }
}

Available tools 23

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

contact

create_contact

MUTATES Quaderno data — create a contact (customer or vendor). Provide kind plus a name; use `fields` for any other Quaderno contact attribute (phone_1, region, postal_code, city, street_line_1/2, tax_status, language, discount, notes, processor/processor_id). Quaderno API: POST /contacts. Returns the created contact.

get_contact

Fetch a single contact by id. Quaderno API: GET /contacts/{id}.

update_contact

MUTATES Quaderno data — update an existing contact. Only the fields you pass are changed; use `fields` for any attribute not typed here. Quaderno API: PUT /contacts/{id}. Returns the updated contact.

credit

get_credit_note

Fetch a single credit note by id. Quaderno API: GET /credit_notes/{id}.

list_credit_notes

List credit notes (refund documents), newest first. Quaderno API: GET /credit_notes. Wrapped as { data, pagination } when more pages exist.

invoice

create_invoice

MUTATES Quaderno data — create an invoice for a contact. Provide contact_id (or a contact via `fields`) and items; use `fields` for any other attribute (currency, issue_date, due_date, po_number, notes, tag_list, custom_metadata, payment_details). Each item = { description, quantity, unit_price, tax_1_name?, tax_1_rate?, discount_rate?, … }. Quaderno API: POST /invoices. Returns the created invoice (incl. permalink, pdf).

get_invoice

Fetch a single invoice by id (full object incl. items, taxes, payments, permalink, pdf). Quaderno API: GET /invoices/{id}.

item

create_item

MUTATES Quaderno data — create a product/item in the catalog. Provide name + unit_cost; use `fields` for any other attribute (code, description, tax_class, tax_type, currency, country, stock). Quaderno API: POST /items. Returns the created item.

get_item

Fetch a single product/item by id. Quaderno API: GET /items/{id}.

calculate

calculate_tax

Calculate the correct tax rate/amount for a sale given the customer's location and product. This is Quaderno's flagship endpoint — it applies the right VAT / GST / US sales-tax rules per jurisdiction. READ-ONLY (no record is created). Quaderno API: GET /tax_rates/calculate. Returns { name, rate, country, region, county, city, tax_code, status (taxable|non_taxable|not_registered|reverse_charge), tax_amount, subtotal, total_amount }.

contacts

list_contacts

List contacts (customers/vendors), newest first. Quaderno API: GET /contacts. Returns contact objects (id, kind, first_name, last_name, contact_name, email, country, tax_id, tax_status, …), wrapped as { data, pagination } when more pages exist.

expense

get_expense

Fetch a single expense by id. Quaderno API: GET /expenses/{id}.

expenses

list_expenses

List expenses (bills you received), newest first. Quaderno API: GET /expenses. Wrapped as { data, pagination } when more pages exist.

invoices

list_invoices

List invoices, newest first, with optional filters. Quaderno API: GET /invoices. Returns invoice objects (id, number, issue_date, due_date, currency, contact, items, taxes, payments, state, total_cents, subtotal_cents), wrapped as { data, pagination } when more pages exist.

items

list_items

List products/items in the catalog, newest first. Quaderno API: GET /items. Returns item objects (id, code, name, kind, product_type, unit_cost, tax_class, tax_type, currency, stock, …), wrapped as { data, pagination } when more pages exist.

jurisdictions

list_jurisdictions

List the tax jurisdictions (id, name, country, region) where the account is registered to collect tax. Quaderno API: GET /jurisdictions.

ping

ping

Verify the API key and connection by pinging Quaderno. Returns account/authentication status. Quaderno API: GET /ping.

quaderno

quaderno_request

Power-user escape hatch: GET any Quaderno API path not wrapped by a dedicated tool. READ-ONLY — only GET is allowed. Path is taken after /api (e.g. "/tax_ids", "/evidence"). Quaderno API: GET {path}.

receipt

get_receipt

Fetch a single receipt by id. Quaderno API: GET /receipts/{id}.

receipts

list_receipts

List receipts, newest first. Quaderno API: GET /receipts. Wrapped as { data, pagination } when more pages exist.

tax

list_tax_codes

List the product tax codes Quaderno supports (id, name, description) — used as the tax_code on products / tax calculations. Quaderno API: GET /tax_codes.

transaction

create_transaction

MUTATES Quaderno data — record a sale or refund transaction (Quaderno computes tax and produces the compliant document). Provide the customer, items, and payment. Use `fields` for any other attribute (date, currency, shipping_address, evidence, processor, processor_id, processor_fee_cents, exchange_rate, po_number, notes, tags, custom_metadata). Quaderno API: POST /transactions. Returns the created invoice/credit-note object.

webhooks

list_webhooks

List the account's configured webhooks (id, url, events). Quaderno API: GET /webhooks.

Endpoints

URL	Transport	State	Latency	Checked
https://quaderno.usefulapi.io/mcp	streamable-http	answering	309 ms	12 min ago

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Quaderno — questions

Answers built from our own checks of this server.

What can Quaderno do?

It exposes 23 tools, read directly from the server on our last check. Among them: calculate_tax, create_contact, create_invoice, create_item, create_transaction, get_contact and 17 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

What is Quaderno mostly used for?

Its tools cluster around contact, invoice and item. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.

Is Quaderno working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 174 ms. The bar chart above shows every period we have measured.

How do I connect Quaderno?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Quaderno need an API key?

No. Quaderno completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 23 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Quaderno?

It answers our handshake in 174 ms on average, which is faster than 71% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Quaderno open source?

Yes — it is published under the MIT licence, written in JavaScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.