Numeral MCP by usefulapi
Calculate sales tax & VAT, record transactions and refunds, manage products and customers.
Connect it
Settings → Connectors → Add custom connector
URL: https://numeral.usefulapi.io/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://numeral.usefulapi.io/mcp{
"mcpServers": {
"numeral": {
"url": "https://numeral.usefulapi.io/mcp"
}
}
}claude mcp add --transport http numeral https://numeral.usefulapi.io/mcp{
"servers": {
"numeral": {
"type": "http",
"url": "https://numeral.usefulapi.io/mcp"
}
}
}11 tools, verified live
numeral_pingread-onlyHealth check — verifies the API key works and reports the environment (test/prod), api_version, and server timestamp. Numeral: GET /tax/ping.
numeral_calculate_taxread-onlyCalculate 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: P
numeral_get_transactionread-onlyGet 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_transaction_refundsread-onlyList all refunds recorded against a transaction. Returns {refunds:[...]}. Numeral: GET /tax/transactions/{transaction_id}/refunds.
numeral_list_productsread-onlyList 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_get_productread-onlyGet 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_customerread-onlyGet 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_create_transactioncan modifyRECORDS 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_create_refundcan modifyRECORDS 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_productcan modifyCREATES (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_customercan modifyCREATES a customer record — this WRITES to your Numeral customer list (used for order tracking and tax exemptions). Numeral: POST /tax/customers.
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