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Numeral MCP by usefulapi MCP Server

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

Calculate sales tax & VAT, record transactions and refunds, manage products and customers.

Uptime history 91 days of history · worst day 0%
91 days agonow
100.0%
Uptime 24h
91 of 91 checks
11
Tools
read from the server
157 ms
Response time
average over 24h
1
Stars
last commit 2 Nov 2026

What changed 42

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 1 October 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 version2 times that day
27 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 a tool changed version
and 32 more, back to 1 October 2026

Numeral MCP by usefulapi missed one check 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.

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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.

run in your terminal
claude mcp add numeral --transport http https://numeral.usefulapi.io/mcp
Settings → Connectors → Add custom connector, then paste this address
https://numeral.usefulapi.io/mcp
~/.codex/config.toml
[mcp_servers.numeral]
url = "https://numeral.usefulapi.io/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "numeral": {
      "url": "https://numeral.usefulapi.io/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "numeral": {
      "type": "http",
      "url": "https://numeral.usefulapi.io/mcp"
    }
  }
}

Available tools 11

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

numeral
numeral_calculate_tax
Calculate sales tax / VAT for an order — a STATELESS quote that persists nothing (record it later with numeral_create_transaction using the returned calculation id). Returns per-jurisdiction rates, total_tax_amount, and totals. Provide a customer address and one or more line items (each needs reference_product_id OR product_category). Amounts are in the currency's smallest unit (cents). Numeral: POST /tax/calculations.
numeral_create_customer
CREATES a customer record — this WRITES to your Numeral customer list (used for order tracking and tax exemptions). Numeral: POST /tax/customers.
numeral_create_product
CREATES (or upserts) a product with its tax category — this WRITES to your Numeral product catalog, which drives future tax calculations. Numeral: POST /tax/products.
numeral_create_refund
RECORDS a refund against a transaction — this WRITES a live tax/compliance record (adjusts tax owed). Use type="full" to refund the whole transaction, or type="partial" with line_items (each keyed by reference_product_id) for a partial refund. Numeral: POST /tax/refunds.
numeral_create_transaction
RECORDS a completed sale as a transaction — this WRITES a live tax/compliance record used for filings. Supply the `calculation_id` returned by numeral_calculate_tax and your `reference_order_id`. Numeral: POST /tax/transactions.
numeral_get_customer
Get a customer by id. By default `customer_id` is the Numeral id (cus_...); set id_type to "reference" to look up by your own reference_customer_id. Returns name, email, and tax-exempt status. Numeral: GET /tax/customers/{customer_id}.
numeral_get_product
Get a single product by its reference_product_id (your id). Returns the product's name, product_category, and timestamps. Numeral: GET /tax/products/{reference_product_id}.
numeral_get_transaction
Get a recorded transaction by its Numeral id (tr_...). Returns the transaction with its line items, currencies, and metadata. Numeral: GET /tax/transactions/{transaction_id}.
numeral_list_products
List your Numeral products (up to 50 per page), each with its reference id, name, and product_category. Use `cursor` (the last_product_id from a previous page) to paginate; has_more indicates more pages. Numeral: GET /tax/products.
numeral_list_transaction_refunds
List all refunds recorded against a transaction. Returns {refunds:[...]}. Numeral: GET /tax/transactions/{transaction_id}/refunds.
numeral_ping
Health check — verifies the API key works and reports the environment (test/prod), api_version, and server timestamp. Numeral: GET /tax/ping.

Endpoints

URLTransportStateLatencyChecked
https://numeral.usefulapi.io/mcp streamable-http answering 70 ms 11 min ago

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Numeral MCP by usefulapi — questions

Answers built from our own checks of this server.

What can Numeral MCP by usefulapi do?
It exposes 11 tools, read directly from the server on our last check. Among them: numeral_calculate_tax, numeral_create_customer, numeral_create_product, numeral_create_refund, numeral_create_transaction, numeral_get_customer and 5 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 Numeral 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 157 ms. The bar chart above shows every period we have measured.
How do I connect Numeral 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 Numeral MCP by usefulapi need an API key?
No. Numeral MCP by usefulapi completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 11 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Numeral MCP by usefulapi?
It answers our handshake in 157 ms on average, which is faster than 81% 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 Numeral 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 numeral.usefulapi.io, which runs on its operator's own terms.