list_exchange_rates

ServerMcp Afip
CategoryRead

WHAT IT DOES

What list_exchange_rates does on Mcp Afip

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

THE RISK

Low Risk

Why list_exchange_rates needs a policy

This tool retrieves exchange rate data from a public Coinbase endpoint. There are no write, execute, destructive, or financial transaction capabilities—it only reads and returns current market rates. The severity is low because misuse (e.g., fetching rates repeatedly) would be a nuisance rather than a security breach, and the data is publicly accessible.

From the tool's definition Tool description states it 'Fetch[es] current Coinbase exchange rates' and explicitly notes 'This endpoint is public and does not require the API key.' The action is retrieval of publicly available data with no side effects.

Risk signalsBulk/mass operation — affects multiple targets

Documented attack patterns abuse exactly the kind of access list_exchange_rates gives an agent:

POLICY

How to control list_exchange_rates

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Afip, and nothing reaches the server without passing your rules. This is the rule we recommend for list_exchange_rates:

policy.json

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

list_exchange_rates is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Mcp Afip — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_exchange_rates

What does the list_exchange_rates tool do? +

Fetch current Coinbase exchange rates for a base asset (e.g. BTC, ETH, USDC) against every supported fiat and crypto. Useful for quoting or reconciling fiat-equivalent amounts. This endpoint is public and does not require the API key. It is categorised as a Read tool in the Mcp Afip MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_exchange_rates? +

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

What risk level is list_exchange_rates? +

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

Can I rate-limit list_exchange_rates? +

Yes. Add a rate_limit block to the list_exchange_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 list_exchange_rates completely? +

Set action: deny in the PolicyLayer policy for list_exchange_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 list_exchange_rates? +

list_exchange_rates is provided by the Mcp Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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