UK Mortgage Repayment MCP
Estimates UK repayment mortgage payments, including monthly payment, total interest, and overpayment impact, for use in ChatGPT.
README
UK Mortgage Repayment MCP
Tool-only MCP server for estimating UK repayment mortgage payments in ChatGPT.
Run Locally
npm install
npm run dev
The server listens at:
http://localhost:8787/mcp
Use PORT=9000 npm run dev to choose a different port.
Tool
calculate_mortgage_repayment
Inputs:
loanAmount: mortgage loan amount in pounds sterlingannualInterestRatePercent: nominal annual interest rate, for example5.25termYears: whole mortgage term in yearsmonthlyOverpayment: optional extra monthly repayment in pounds sterling
Outputs include monthly payment, total paid, total interest, and overpayment impact when provided.
Connect To ChatGPT
For local development, expose the MCP server over HTTPS with a tunnel:
ngrok http 8787
Then add the app in ChatGPT developer mode using the HTTPS URL with /mcp, for example:
https://example.ngrok.app/mcp
Verify
npm test
npm run build
npm run typecheck
You can also test the MCP endpoint with the MCP Inspector:
npx @modelcontextprotocol/inspector@latest --server-url http://localhost:8787/mcp --transport http
The calculation is an estimate for illustration only and is not financial advice.
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