Numeral MCP by usefulapi

Numeral MCP by usefulapi

Manage Numeral sales-tax compliance from Claude, Cursor, or any MCP client — calculate sales tax and VAT, record transactions and refunds, and manage products and customers. Hosted, no local install: connect with your Numeral API key.

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

Connect

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

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

On first connect you'll paste your Numeral API key (from the Numeral dashboard). It's validated, stored per-user, and scoped to you — no keys in config files.

Tools

Tool	Type	What it does
numeral_ping	read	Ping (health check)
numeral_calculate_tax	read	Calculate tax
numeral_get_transaction	read	Get transaction
numeral_list_transaction_refunds	read	List transaction refunds
numeral_list_products	read	List products
numeral_get_product	read	Get product
numeral_get_customer	read	Get customer
numeral_create_transaction	write	Create transaction
numeral_create_refund	write	Create refund
numeral_create_product	write	Create product
numeral_create_customer	write	Create customer
numeral_usage_status	meta	Usage status (free-tier meter)
numeral_request_feature	meta	Request a missing feature
numeral_upgrade	meta	Upgrade to Pro (unlimited*)
numeral_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)	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 numeral_upgrade (it returns a Stripe Checkout link). Cancel any time with numeral_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running numeral_upgrade before then undoes the cancel. Or write to [email protected].

License

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