AI agents call exchangerate_latest to retrieve information from UnClick without modifying anything — 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) |
api_key | string | — | ExchangeRate-API key (or set EXCHANGERATE_API_KEY). Optional for latest rates. |
Parameters from the server's own tool schema.
This tool queries and returns current exchange rate data. It does not create, modify, delete, execute code, or commit financial transactions. The action is informational only, with no state changes or irreversible effects. Misuse by an AI agent would be limited to retrieving unwanted exchange rate data, which poses minimal risk.
From the tool's definition Tool description states 'Get latest currency exchange rates' — a retrieval operation with no modification or side effects. The phrase 'Works without API key using the free tier' further confirms it is a simple data-fetching utility.
Risk signalsHandles credentials or secrets (api_key)
Attacks that exploit this kind of access
Get latest currency exchange rates for a base currency. Works without API key using the free tier. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
exchangerate_latest accepts 2 parameters: base, api_key. The full parameter table on this page comes from the server's own tool schema.
Register the UnClick MCP server in PolicyLayer and add a rule for exchangerate_latest: 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.
exchangerate_latest 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 exchangerate_latest 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 exchangerate_latest. 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.
exchangerate_latest 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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