Quaderno MCP by usefulapi

Quaderno MCP by usefulapi

Calculate tax rates and read or create your invoices, contacts and transactions from Claude, Cursor, or any MCP client. Hosted, no local install — connect with your Quaderno API key.

Live endpoint: https://quaderno.usefulapi.io/mcp · Homepage: https://usefulapi.io/quaderno

Connect

• Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://quaderno.usefulapi.io/mcp.
• Claude Code: claude mcp add --transport http quaderno https://quaderno.usefulapi.io/mcp, then run /mcp to log in.
• VS Code: Add to VS Code.
• Cursor and other clients: add the URL as a remote MCP server:

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

Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and the login page asks for your Quaderno credentials.

Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/quaderno/

On first connect you'll paste your Quaderno API key and account subdomain. It's validated, stored per-user, and scoped to you.

Tools

Tool	Type	What it does
quaderno_ping	read	Ping (verify auth)
quaderno_calculate_tax	read	Calculate tax rate
quaderno_list_invoices	read	List invoices
quaderno_get_invoice	read	Get an invoice
quaderno_list_contacts	read	List contacts
quaderno_get_contact	read	Get a contact
quaderno_list_items	read	List products (items)
quaderno_get_item	read	Get a product (item)
quaderno_list_credit_notes	read	List credit notes
quaderno_get_credit_note	read	Get a credit note
quaderno_list_receipts	read	List receipts
quaderno_get_receipt	read	Get a receipt
quaderno_list_expenses	read	List expenses
quaderno_get_expense	read	Get an expense
quaderno_list_tax_codes	read	List tax codes
quaderno_list_jurisdictions	read	List tax jurisdictions
quaderno_list_webhooks	read	List webhooks
quaderno_request	read	Raw read request
quaderno_create_contact	write	Create a contact
quaderno_update_contact	write	Update a contact
quaderno_create_item	write	Create a product (item)
quaderno_create_invoice	write	Create an invoice
quaderno_create_transaction	write	Create a transaction
quaderno_usage_status	meta	Usage status (free-tier meter)
quaderno_request_feature	meta	Request a missing feature
quaderno_upgrade	meta	Upgrade to Pro (unlimited*)
quaderno_cancel_subscription	meta	Cancel the Pro subscription

read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.

Pricing

Plan	Price	Limit
Free	$0	50 tool calls / month
Pro	$9/mo or $90/yr (2 months free)	Unlimited*

*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to [email protected].

Pro covers this server only. Subscribe with quaderno_upgrade (it returns a Stripe Checkout link). Cancel any time with quaderno_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running quaderno_upgrade before then undoes the cancel. Or write to [email protected].

License

MIT — see LICENSE. Documentation only; the server is hosted.