Quaderno MCP by usefulapi MCP Server

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answering

Quaderno MCP by usefulapi is answering right now. Last checked 11 min ago. It exposes 23 tools. Last commit 2 Nov 2026.

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

Uptime history 91 days of history · worst day 20%

91 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

156 ms

Response time

average over 24h

Stars

last commit 2 Nov 2026

What changed 98

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 30 September 2026. No other catalogue keeps this.

2 Nov a tool changed version

31 Oct a tool changed version4 times that day

30 Oct a tool changed version2 times that day

29 Oct a tool changed version2 times that day

28 Oct a tool changed version

25 Oct a tool changed version4 times that day

24 Oct a tool changed version3 times that day

23 Oct a tool changed version

22 Oct 22 tools appeared quaderno_calculate_tax, quaderno_create_contact, quaderno_create_invoice and 19 more

22 Oct 22 tools disappeared calculate_tax, create_contact, create_invoice and 19 more

and 46 more, back to 30 September 2026

Quaderno MCP by usefulapi missed 2 checks this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 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

Settings → Connectors → Add custom connector, then paste this address

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

{
  "servers": {
    "quaderno": {
      "type": "http",
      "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.

quaderno

quaderno_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 }.

quaderno_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.

quaderno_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).

quaderno_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.

quaderno_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.

quaderno_get_contact

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

quaderno_get_credit_note

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

quaderno_get_expense

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

quaderno_get_invoice

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

quaderno_get_item

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

quaderno_get_receipt

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

quaderno_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.

quaderno_list_credit_notes

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

quaderno_list_expenses

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

quaderno_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.

quaderno_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.

quaderno_list_jurisdictions

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

quaderno_list_receipts

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

quaderno_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.

quaderno_list_webhooks

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

quaderno_ping

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

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}.

quaderno_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.

Tools removed

Tools this server used to expose. Anything built against them stopped working on the day they went.

calculate_tax

removed 22 Oct 2026

create_contact

removed 22 Oct 2026

create_invoice

removed 22 Oct 2026

create_item

removed 22 Oct 2026

create_transaction

removed 22 Oct 2026

get_contact

removed 22 Oct 2026

get_credit_note

removed 22 Oct 2026

get_expense

removed 22 Oct 2026

get_invoice

removed 22 Oct 2026

get_item

removed 22 Oct 2026

get_receipt

removed 22 Oct 2026

list_contacts

removed 22 Oct 2026

list_credit_notes

removed 22 Oct 2026

list_expenses

removed 22 Oct 2026

list_invoices

removed 22 Oct 2026

list_items

removed 22 Oct 2026

list_jurisdictions

removed 22 Oct 2026

list_receipts

removed 22 Oct 2026

list_tax_codes

removed 22 Oct 2026

list_webhooks

removed 22 Oct 2026

ping

removed 22 Oct 2026

update_contact

removed 22 Oct 2026

Endpoints

URL	Transport	State	Latency	Checked
https://quaderno.usefulapi.io/mcp	streamable-http	answering	75 ms	11 min ago

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Quaderno MCP by usefulapi — questions

Answers built from our own checks of this server.

What can Quaderno MCP by usefulapi do?

It exposes 23 tools, read directly from the server on our last check. Among them: quaderno_calculate_tax, quaderno_create_contact, quaderno_create_invoice, quaderno_create_item, quaderno_create_transaction, quaderno_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 →

Is Quaderno MCP by usefulapi 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 156 ms. The bar chart above shows every period we have measured.

Did Quaderno MCP by usefulapi ever remove tools?

Yes. calculate_tax, create_contact, create_invoice, create_item and 18 more are no longer exposed — we recorded the date each one disappeared. A tool vanishing usually means a breaking change for anything that depended on it.

How do I connect Quaderno MCP by usefulapi?

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

Does Quaderno MCP by usefulapi need an API key?

No. Quaderno MCP by usefulapi 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 MCP by usefulapi?

It answers our handshake in 156 ms on average, which is faster than 82% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Quaderno MCP by usefulapi open source?

The code is open source: it is published under the MIT licence, written in JavaScript, 1 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at quaderno.usefulapi.io, which runs on its operator's own terms.