Zero Plus One MCP by usefulapi

Zero Plus One MCP by usefulapi

Use your Zero Plus One account from Claude, Cursor, or any MCP client. Read invoices, quotes, contacts, financial reports and bank reconciliation data. Hosted, no local install: connect with your own credentials.

Live endpoint: https://zero-plus-one.usefulapi.io/mcp · Homepage: https://usefulapi.io

Connect

• Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://zero-plus-one.usefulapi.io/mcp.
• Claude Code: claude mcp add --transport http zero-plus-one https://zero-plus-one.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": {
    "zero-plus-one": {
      "url": "https://zero-plus-one.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 Zero Plus One credentials.

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

On first connect you provide a Zero Plus One API key (Settings → Developer in Zero Plus One: a Custom Connection key with the View scopes you need). The server validates it and stores it per user. No keys go in config files.

Tools

Tool	Type	What it does
zeroplusone_list_invoices	read	List invoices
zeroplusone_get_invoice	read	Get an invoice
zeroplusone_list_contacts	read	List contacts
zeroplusone_get_contact	read	Get a contact
zeroplusone_list_credit_notes	read	List credit notes
zeroplusone_get_credit_note	read	Get a credit note
zeroplusone_list_quotes	read	List quotes
zeroplusone_get_quote	read	Get a quote
zeroplusone_list_recurring_invoices	read	List recurring invoices
zeroplusone_get_recurring_invoice	read	Get a recurring invoice
zeroplusone_list_tax_rates	read	List tax rates
zeroplusone_get_tax_rate	read	Get a tax rate
zeroplusone_get_profit_and_loss	read	Profit and loss report
zeroplusone_get_balance_sheet	read	Balance sheet
zeroplusone_get_trial_balance	read	Trial balance
zeroplusone_get_cash_flow	read	Cash flow report
zeroplusone_get_vat_return	read	VAT return (VAT 201)
zeroplusone_get_kpi_summary	read	KPI summary
zeroplusone_get_aged_receivables	read	Aged receivables
zeroplusone_get_aged_payables	read	Aged payables
zeroplusone_get_open_invoices	read	Open invoices report
zeroplusone_get_reconciliation_summary	read	Reconciliation summary
zeroplusone_list_reconciliation_lines	read	List bank lines to reconcile
zeroplusone_get_reconciliation_suggestions	read	Reconciliation suggestions
zeroplusone_usage_status	meta	Usage status (free-tier meter)
zeroplusone_request_feature	meta	Request a missing feature
zeroplusone_upgrade	meta	Upgrade to Pro or Pro+
zeroplusone_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 (per user)	$9/mo or $90/yr (2 months free)	10,000 tool calls / month
Pro+ (per user)	$39/mo or $390/yr (2 months free)	100,000 tool calls / month

Each paid plan covers this server only. Ask your AI to run zeroplusone_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with zeroplusone_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with zeroplusone_upgrade before then undoes the cancel. Or write to [email protected].

License

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