convert_currency
Convert between currencies using real-time exchange rates. Use this for currency conversion, financial calculations, or comparing prices across different currencies. Supports 160+ currencies including USD, GBP, EUR, JPY, CAD, AUD, and more. Parameters: from_ — Source currency code (default: "USD"...
This record as markdown: /tools/com-gadgethumans-swarm-x402-middleware/convert-currency.md
What convert_currency does on X402 Middleware
AI agents call convert_currency 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 |
|---|---|---|---|
to | string | — | |
from_ | string | — | |
amount | number | — |
Parameters from the server's own tool schema.
Why convert_currency is rated Low
This tool retrieves real-time exchange rate data and performs a currency conversion calculation. It does not move money, create transactions, or commit financial obligations — it is purely an informational/read operation that returns a converted amount. Despite the server's payment-focused context, this specific tool only queries exchange rates and computes a result.
From the tool's definition Convert between currencies using real-time exchange rates... Supports 160+ currencies
Attacks that exploit this kind of access
The rule that runs convert_currency 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 convert_currency, this is the rule to start with:
convert_currency 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 convert_currency call is checked against it from then on.
Questions about convert_currency
Convert between currencies using real-time exchange rates. Use this for currency conversion, financial calculations, or comparing prices across different currencies. Supports 160+ currencies including USD, GBP, EUR, JPY, CAD, AUD, and more. Parameters: from_ — Source currency code (default: "USD"). Three-letter ISO code. to — Target currency code (default: "GBP"). Three-letter ISO code. amount — Amount to convert (default: 1). Positive number. It is categorised as a Read tool in the X402 Middleware MCP Server, which means it retrieves data without modifying state.
convert_currency accepts 3 parameters: to, from_, amount. 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 convert_currency: 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.
convert_currency 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 convert_currency 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 convert_currency. 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.
convert_currency 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.
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