Converts an amount between any cryptocurrency and fiat currency pair, or between two cryptocurrencies, using real-time exchange rates sourced from CoinAPI. Supports all crypto-to-fiat (BTC/USD, ETH/EUR), fiat-to-crypto (USD/BTC), and cross-crypto (BTC/ETH) conversions. Use crypto_fx_rates when th...
Part of the Inferventis — Financial Data, News & Web MCP server.
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AI agents call crypto_fx_rates to retrieve information from Inferventis — Financial Data, News & Web MCP without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though crypto_fx_rates only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"crypto_fx_rates": {}
}
}See the full Inferventis — Financial Data, News & Web MCP policy for all 20 tools.
These attack patterns abuse exactly the kind of access crypto_fx_rates gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Converts an amount between any cryptocurrency and fiat currency pair, or between two cryptocurrencies, using real-time exchange rates sourced from CoinAPI. Supports all crypto-to-fiat (BTC/USD, ETH/EUR), fiat-to-crypto (USD/BTC), and cross-crypto (BTC/ETH) conversions. Use crypto_fx_rates when the conversion involves at least one cryptocurrency and a specific amount must be converted. Prefer crypto_price when only the spot price of a coin in fiat is needed without converting a specific amount, or prefer crypto_price_lite for the same spot price with a minimal response schema. Prefer currency_convert or currency_fx_lite when both currencies are fiat — those tools use ECB/Frankfurter or mid-market rates and do not consume a CoinAPI quota. Requires a CoinAPI key to be configured on the server.. It is categorised as a Read tool in the Inferventis — Financial Data, News & Web MCP MCP Server, which means it retrieves data without modifying state.
Register the Inferventis — Financial Data, News & Web MCP server in PolicyLayer and add a rule for crypto_fx_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 Inferventis — Financial Data, News & Web MCP. Nothing to install.
crypto_fx_rates 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 crypto_fx_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.
Set action: deny in the PolicyLayer policy for crypto_fx_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.
crypto_fx_rates is provided by the Inferventis — Financial Data, News & Web MCP server (https://mcp-server-295985738387.europe-west1.run.app/mcp-pay?src=registry). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 20 Inferventis — Financial Data, News & Web MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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