fx.timeseries

SERVERMcp SOURCE@2sio/mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-2s-io-mcp/fx.timeseries.md

WHAT IT DOES

What fx.timeseries does on Mcp

AI agents call fx.timeseries to retrieve information from Mcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why fx.timeseries is rated Low

This tool retrieves historical exchange rate data and computes statistics on it. It is purely a read/query operation with no side effects — it does not move money, execute code, or modify any data. Despite being on a pay-per-call server, the tool itself only fetches and returns financial data, it does not execute trades or financial transactions.

From the tool's definition Historical daily exchange-rate series from the European Central Bank (via Frankfurter) with computed stats... Returns per-currency first/last/min/max/mean and absolute + % change, plus the full daily series.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs fx.timeseries safely

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

fx.timeseries Allowed

fx.timeseries 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.timeseries": {}
  }
}

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

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

FAQ

Questions about fx.timeseries

What does the fx.timeseries tool do? +

Historical daily exchange-rate series from the European Central Bank (via Frankfurter) with computed stats. base (default USD), start (YYYY-MM-DD, required), optional end (default latest), symbols (comma-separated target codes), amount. Range capped at 366 days. Returns per-currency first/last/min/max/mean and absolute + % change, plus the full daily series. Business days only. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on fx.timeseries? +

Register the MCP server in PolicyLayer and add a rule for fx.timeseries: 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. Nothing to install.

What risk level is fx.timeseries? +

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

Can I rate-limit fx.timeseries? +

Yes. Add a rate_limit block to the fx.timeseries 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.timeseries completely? +

Set action: deny in the PolicyLayer policy for fx.timeseries. 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.timeseries? +

fx.timeseries is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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