Get the current mid-market FX rate for a currency pair. Always free, no authentication required.
AI agents call check_fx_rate to retrieve information from iPayX FX Audit — Hidden Bank Fee Detector without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
currency_to | string | — | ISO 4217 quote currency (e.g. CAD) |
currency_from | string | — | ISO 4217 base currency (e.g. USD) |
Parameters from the server's own tool schema.
This tool retrieves public FX rate data without modifying, executing operations, or incurring financial obligations. It performs a read-only query of market rates. While the server context involves financial auditing, this specific tool merely fetches informational data.
From the tool's definition Tool name 'check_fx_rate' and description 'Get the current mid-market FX rate for a currency pair' indicate data retrieval with no side effects.
Documented attack patterns abuse exactly the kind of access check_fx_rate gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and iPayX FX Audit — Hidden Bank Fee Detector, and nothing reaches the server without passing your rules. This is the rule we recommend for check_fx_rate:
{
"version": "1",
"default": "deny",
"tools": {
"check_fx_rate": {}
}
}check_fx_rate is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Get the current mid-market FX rate for a currency pair. Always free, no authentication required. It is categorised as a Read tool in the iPayX FX Audit — Hidden Bank Fee Detector MCP Server, which means it retrieves data without modifying state.
check_fx_rate accepts 2 parameters: currency_to, currency_from. The full parameter table on this page comes from the server's own tool schema.
Register the iPayX FX Audit — Hidden Bank Fee Detector MCP server in PolicyLayer and add a rule for check_fx_rate: 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 iPayX FX Audit — Hidden Bank Fee Detector. Nothing to install.
check_fx_rate 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 check_fx_rate 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 check_fx_rate. 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.
check_fx_rate is provided by the iPayX FX Audit — Hidden Bank Fee Detector MCP server (ybolduc/ipayx-fx-audit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from iPayX FX Audit — Hidden Bank Fee Detector, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
3 iPayX FX Audit — Hidden Bank Fee Detector tools catalogued and risk-classified — across an index of 43,000+ MCP servers.