Numeral MCP by usefulapi

io.usefulapiPublished by usefulapi.ioOfficial publisherv1.36.5Updated Nov 8, 2026

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

The publisher's own server: Ably MCP by usefulapi

VerifiedStreamable HTTPWeb executableFinanceBusiness & Commerce

Overview

AI-generated overview

Hosted Numeral server for calculating sales tax and VAT and managing tax transactions, refunds, products and customers.

What you can do
  • Check API health and environment, and view monthly usage or request features and plan changes
  • Calculate sales tax or VAT for an order from a customer address and line items, returning per-jurisdiction rates and totals
  • Read recorded transactions, their refunds, products and customers by Numeral or reference id
  • Record a completed sale as a transaction using a prior calculation id
  • Record full or partial refunds against a transaction
  • Create or upsert products and create customer records
When to use it
Useful when an assistant should quote sales tax or VAT for an order and then keep Numeral's tax records in step with real sales, refunds, catalog items and customers, without a local install.
Requirements
Remote streamable HTTP endpoint; no local package. Connect with the URL only and sign in through OAuth, pasting a Numeral API key from the Numeral dashboard on first connect. A Numeral account is required; the free plan allows 50 tool calls per month.
Before you install
Write tools create live tax/compliance records used for filings: transactions, refunds, products and customers. Confirm before any write. Paid plans are billed through a Stripe Checkout link returned by the upgrade tool, and cancellation runs to the end of the paid period with no refund for the current period. The API key is stored per user on the hosted service.

Installation

In SourceWeft

  1. Open Numeral MCP by usefulapi in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.usefulapi%2Fnumeral/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "numeral-by-usefulapi": {
      "type": "http",
      "url": "https://numeral.usefulapi.io/mcp"
    }
  }
}

README

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:
json
{  "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

ToolTypeWhat it does
numeral_pingreadPing (health check)
numeral_calculate_taxreadCalculate tax
numeral_get_transactionreadGet transaction
numeral_list_transaction_refundsreadList transaction refunds
numeral_list_productsreadList products
numeral_get_productreadGet product
numeral_get_customerreadGet customer
numeral_create_transactionwriteCreate transaction
numeral_create_refundwriteCreate refund
numeral_create_productwriteCreate product
numeral_create_customerwriteCreate customer
numeral_usage_statusmetaUsage status (free-tier meter)
numeral_request_featuremetaRequest a missing feature
numeral_upgrademetaUpgrade to Pro or Pro+
numeral_cancel_subscriptionmetaCancel 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

PlanPriceLimit
Free$050 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.

Source: servers/numeral/README.md at commit 4046075

Tools

11

numeral_ping

Ping (health check)

Health check — verifies the API key works and reports the environment (test/prod), api_version, and server timestamp. Numeral: GET /tax/ping.

Takes no parameters.

numeral_calculate_tax

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.

Parameterscustomerrequiredmetadataorder_detailsrequiredorigin_address

numeral_get_transaction

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}.

Parameterstransaction_idrequired

numeral_list_transaction_refunds

List transaction refunds

List all refunds recorded against a transaction. Returns {refunds:[...]}. Numeral: GET /tax/transactions/{transaction_id}/refunds.

Parameterstransaction_idrequired

numeral_list_products

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.

Parameterscursor

numeral_get_product

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}.

Parametersreference_product_idrequired

numeral_get_customer

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}.

Parametersid_typecustomer_idrequired

numeral_create_transaction

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.

Parametersmetadatacalculation_idrequiredreference_order_idrequiredtransaction_processed_at

numeral_create_refund

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.

Parameterstyperequiredline_itemstransaction_idrequiredrefund_processed_at

numeral_create_product

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.

Parametersproduct_categoryrequiredreference_product_idrequiredreference_product_namerequired

numeral_create_customer

Create customer

CREATES a customer record — this WRITES to your Numeral customer list (used for order tracking and tax exemptions). Numeral: POST /tax/customers.

Parametersnameemailrequiredis_tax_exemptreference_customer_id

Version history

22
  1. v1.36.5LatestNov 8, 2026
  2. v1.36.4Nov 7, 2026
  3. v1.35.3Nov 5, 2026
  4. v1.35.2Nov 5, 2026
  5. v1.35.1Nov 4, 2026
  6. v1.35.0Nov 3, 2026
  7. v1.34.1Nov 3, 2026
  8. v1.33.0Nov 1, 2026
  9. v1.31.0Oct 31, 2026
  10. v1.30.0Oct 31, 2026
  11. v1.29.2Oct 30, 2026
  12. v1.29.0Oct 30, 2026
  13. v1.24.0Oct 26, 2026
  14. v1.21.3Oct 25, 2026
  15. v1.21.0Oct 25, 2026
  16. v1.20.0Oct 24, 2026
  17. v1.17.0Oct 23, 2026
  18. v1.16.4Oct 22, 2026
  19. v1.16.3Oct 21, 2026
  20. v1.11.1Oct 9, 2026
  21. v1.10.0Oct 9, 2026
  22. v1.0.0Sep 16, 2026

Score

100% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

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