er_latest_rates

Get latest exchange rates from ExchangeRate-API (open endpoint).

SERVERUnClick SOURCE@unclick/mcp-server

Low RISK CLASS

Category Read

Parameters 10 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-malamutemayhem-unclick-mcp-server/er-latest-rates.md

WHAT IT DOES

What er_latest_rates does on UnClick

AI agents call er_latest_rates to retrieve information from UnClick 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
`base`	string	—	Base currency code (default: USD)

Parameters from the server's own tool schema.

RISK

Why er_latest_rates is rated Low

This tool retrieves current exchange rate data from a public API. It performs a read-only query operation with no capability to create, modify, delete, or execute arbitrary code. The data retrieved is informational and does not enable financial transactions themselves.

From the tool's definition Tool description states 'Get latest exchange rates' which is a retrieval operation with no side effects. The phrase 'open endpoint' further indicates this is a query-only operation that does not modify state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs er_latest_rates safely

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

er_latest_rates Allowed

er_latest_rates 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": {
    "er_latest_rates": {}
  }
}

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

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

FAQ

Questions about er_latest_rates

What does the er_latest_rates tool do? +

Get latest exchange rates from ExchangeRate-API (open endpoint). It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.

What parameters does er_latest_rates accept? +

er_latest_rates accepts 1 parameter: base. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on er_latest_rates? +

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

What risk level is er_latest_rates? +

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

Can I rate-limit er_latest_rates? +

Yes. Add a rate_limit block to the er_latest_rates 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 er_latest_rates completely? +

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

er_latest_rates is provided by the UnClick MCP server (@unclick/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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