What this MCP does
The Mamble MCP server exposes read-only financial calculator tools. Each tool returns deterministic numbers (monthly payment, DTI, refinance savings, etc.) and an optional interactive widget in supported clients.
- No login required
- No writes to your accounts or data stores
- Educational estimates — not loan offers or financial advice
Server
This is a hosted MCP server. Connect your MCP-compatible client using:
https://calculators.mamblellc.com/mcp
- Transport: Streamable HTTP (MCP over HTTPS)
- Authentication: None — public read-only calculators
- Protocol: Standard MCP (
tools/list,tools/call,resources/list)
How to connect
- In your MCP client, add a remote HTTP MCP server.
- Enter the server URL:
https://calculators.mamblellc.com/mcp - Enable the connection. Your client will discover available tools automatically.
Exact menu labels vary by client; look for “MCP server”, “connector”, or “remote MCP”. No API key or OAuth is required for this server.
How to use
After connecting, ask your assistant to run a calculator in plain language. The assistant selects the right tool and returns structured results (and an interactive widget when supported).
Example prompts:
- “What is the monthly payment on a $400,000 home with 20% down at 6.5%?”
- “How much house can I afford on $120,000 income with $500/month in other debt?”
- “Compare a 15-year vs 30-year mortgage on $350,000.”
- “Should I refinance from 7.2% to 6.1% with $4,000 in closing costs?”
Provide numbers when you can (price, rate, term, income, debts). Missing fields can use sensible defaults; results are estimates for planning, not loan approvals.
Available tools (21)
Mortgage, affordability, DTI, PMI, APR, buydown, extra payments, refinance, break-even, cash-out, ROI, DSCR, cash flow, cap rate, loan comparison, FHA vs conventional, 15 vs 30 year, buy vs rent, amortization schedule, closing costs, prepayment penalty.
Machine-readable schemas: /openapi.json
Interactive widgets
Many tools include an optional HTML widget resource you can adjust in the client UI. If a widget does not appear, the numeric result and summary text from the tool call are still valid.
Troubleshooting
- Connection failed — Use HTTPS and the exact URL above (no extra path segments).
- OAuth or login prompt — Not used on this server; skip OAuth setup in your client.
- Rate limited — Wait briefly and retry if you send many requests in a short time.
- Unexpected numbers — Note the tool name and inputs when reporting an issue.
Status endpoints:
Privacy
Calculator inputs are processed to produce results. We do not require an account for MCP use. See the main site for terms and privacy policy. Website analytics (PostHog) applies to the web app only, not MCP tool calls.
Support
Website: calculators.mamblellc.com
Email: [email protected]
Issues with a specific calculator? Describe the tool name, inputs, and expected vs actual result when contacting support.