• VALIDATION
  • TAXATION
  • CONVERSION
  • REVIEW

How to generate precise invoice payloads with your AI

Connect this MCP to your AI client to stop floating-point errors from breaking your billing integrations. It handles the heavy lifting of currency math so your payloads are always valid.

Ask AI about this page

Short answer

How can I make sure my AI's invoice math is accurate?

The AI uses integer-based calculations to avoid the rounding errors common with decimals. This ensures every line item, tax amount, and total matches exactly what your billing API expects. You get clean, error-free JSON payloads every time.

The results.

Where your data lands.

The AI processes your raw numbers into structured, API-ready formats.

VALIDATION

Error-free payloads

The AI calculates totals using integer math. You get JSON objects that pass strict billing API validation tests.

TAXATION

Precise tax splits

The AI calculates tax amounts for individual line items and the grand total. It ensures the math stays consistent across the whole document.

CONVERSION

Currency adjustments

The AI handles the math for different currencies. It keeps everything in the correct integer format to prevent cents from disappearing.

REVIEW

Human oversight

The AI presents the final calculated values to you. You check the math before you send the payload to your billing system.

The workflow

What your AI does when the data arrives.

Your agent takes your messy pricing data and turns it into a structured payload.

  1. Parse raw inputs

    The AI reads your list of prices, quantities, and tax rates from your chat or a spreadsheet.

    calculate_currency

  2. Execute integer math

    The AI converts all decimal values into integers to perform exact calculations for line items and taxes.

    calculate_currency

  3. Verify totals

    The AI checks that the sum of all line items and taxes equals the final total provided.

    calculate_currency

  4. Format JSON

    The AI organizes the final numbers into a clean payload ready for your billing software.

    calculate_currency

Try it

Copy these to start.

Use these prompts to kick off the math process.

Starting points

Swap the bracketed text with your actual pricing data or spreadsheet references.

currency.js Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_5NKbd1XQQAcf3ixbQFgDqA1EW0unjlSmIiGFqbYs/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — currency.js capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "currency-math-engine-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_5NKbd1XQQAcf3ixbQFgDqA1EW0unjlSmIiGFqbYs/mcp"
    }
  }
}
Copy into chat04

  • Calculate the total for these line items: [paste items] and apply a 7% tax.

  • Convert these USD prices to EUR and give me the integer-based totals for my invoice.

  • Check the math on this invoice payload to ensure the tax and totals match: [paste JSON].

  • Generate a JSON payload for an invoice with 3 items at these prices: [paste prices].

  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Start here

Connect Currency Math Engine once, then ask.

Just click the link to connect the MCP to your client. Your credentials stay encrypted and you can start running math tasks immediately.

Connect Currency Math Engine to your AI

FAQ

How this task behaves.

  • 01

    Why use integer math instead of decimals?

    Floating-point math in computers often causes tiny rounding errors. Using integers, like calculating in cents instead of dollars, ensures your totals are exact and won't be rejected by billing APIs.

  • 02

    Can the AI update my actual billing account?

    No. The AI only generates the math and the payload. You are responsible for sending that data to your billing provider.

  • 03

    Does the AI handle currency conversion?

    Yes, it can calculate the math required to move between different currency amounts while maintaining precision.

  • 04

    Will the AI change my original spreadsheet data?

    No. The AI only reads your data to perform calculations. It does not have the capability to write to or modify your files.

  • 05

    Can it calculate complex tax rules?

    It can calculate any tax rate you provide, but it doesn't know your local tax laws. You must tell it which percentage to apply.

  • More questions about Currency Math Engine? The Connector page answers them. See everything the Currency Math Engine Connector can do

Connect currency.js to Claude, Cursor, ChatGPT & more