fx_rate

SERVERMcp Knowledge SOURCEhttps://mcp.gapup.io

Low RISK CLASS

Category Read

Parameters 42 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-getgapup-mcp-knowledge/fx-rate.md

WHAT IT DOES

What fx_rate does on Mcp Knowledge

AI agents call fx_rate to retrieve information from Mcp Knowledge 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	Yes	Quote currency, ISO-4217 (e.g. USD)
`date`	string	—	Optional YYYY-MM-DD for a historical rate
`from`	string	Yes	Base currency, ISO-4217 (e.g. EUR)
`async`	boolean	—	If true, returns a job_id immediately (<200ms) instead of waiting for the result. Poll the result with job_result(job_id). Use for slow tools to avoid client ti

Parameters from the server's own tool schema.

RISK

Why fx_rate is rated Low

This is a pure data retrieval tool that queries existing exchange rate information without side effects. While the data serves financial workflows, the tool itself does not move money, execute trades, modify data, or commit financial obligations.

From the tool's definition Tool retrieves current or historical foreign-exchange rates via a query interface ("Get the current or historical foreign-exchange rate", "Returns the latest spot rate, or a historical rate by date").

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs fx_rate safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Knowledge, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For fx_rate, this is the rule to start with:

fx_rate Allowed

fx_rate is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "fx_rate": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Knowledge, apply this rule, and every fx_rate call is checked against it from then on.

FAQ

Questions about fx_rate

What does the fx_rate tool do? +

Get the current or historical foreign-exchange rate for any currency pair — the exact exchange rate, FX rate or conversion rate an agent needs to convert a currency amount or feed a finance, trading, invoicing or pricing workflow. Covers EUR/USD, USD/JPY, GBP/EUR and every ISO-4217 currency pair. Returns the latest spot rate, or a historical rate by date. Use when a workflow needs a precise live or past currency exchange rate, or to convert money between two currencies. Source: European Central Bank reference rates via Frankfurter. Inputs: from/to ISO-4217 currency codes, optional date (YYYY-MM-DD). It is categorised as a Read tool in the Mcp Knowledge MCP Server, which means it retrieves data without modifying state.

What parameters does fx_rate accept? +

fx_rate accepts 4 parameters: to, date, from, async. Required: to, from. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on fx_rate? +

Register the Mcp Knowledge MCP server in PolicyLayer and add a rule for 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 Mcp Knowledge. Nothing to install.

What risk level is fx_rate? +

fx_rate is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit fx_rate? +

Yes. Add a rate_limit block to the 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.

How do I block fx_rate completely? +

Set action: deny in the PolicyLayer policy for 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.

What MCP server provides fx_rate? +

fx_rate is provided by the Mcp Knowledge MCP server (https://mcp.gapup.io). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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