mortgage_calculator
Calculate monthly mortgage payments, total interest, and amortization. Parameters: principal — Loan principal amount. rate — Annual interest rate (e.g. 5.5 for 5.5%). years — Loan term in years.
This record as markdown: /tools/com-gadgethumans-swarm-x402-middleware/mortgage-calculator.md
What mortgage_calculator does on X402 Middleware
AI agents call mortgage_calculator to retrieve information from X402 Middleware without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
rate | number | Yes | |
years | integer | Yes | |
principal | number | Yes |
Parameters from the server's own tool schema.
Why mortgage_calculator is rated Low
This is a pure calculation tool that takes numerical inputs and returns computed financial metrics. It performs no write operations, does not execute arbitrary code, does not delete data, and does not process actual payments or financial transactions. Despite the financial context (mortgage/payments), the tool itself only reads/computes; it does not move money, charge accounts, or create financial obligations.
From the tool's definition Tool description states it 'Calculate[s] monthly mortgage payments, total interest, and amortization' with parameters for principal, rate, and years.
Attacks that exploit this kind of access
The rule that runs mortgage_calculator safely
PolicyLayer is an MCP gateway: it sits between your AI agents and X402 Middleware, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For mortgage_calculator, this is the rule to start with:
mortgage_calculator is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect X402 Middleware, apply this rule, and every mortgage_calculator call is checked against it from then on.
Questions about mortgage_calculator
Calculate monthly mortgage payments, total interest, and amortization. Parameters: principal — Loan principal amount. rate — Annual interest rate (e.g. 5.5 for 5.5%). years — Loan term in years. It is categorised as a Read tool in the X402 Middleware MCP Server, which means it retrieves data without modifying state.
mortgage_calculator accepts 3 parameters: rate, years, principal. Required: rate, years, principal. The full parameter table on this page comes from the server's own tool schema.
Register the X402 Middleware MCP server in PolicyLayer and add a rule for mortgage_calculator: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches X402 Middleware. Nothing to install.
mortgage_calculator is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the mortgage_calculator rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for mortgage_calculator. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
mortgage_calculator is provided by the X402 Middleware MCP server (@gadgethumans/x402). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
More on X402 Middleware, and thousands of servers like it.
This server
Across the catalogue