Converts a monetary amount from one currency to another using live exchange rates sourced from the Frankfurter API (European Central Bank data). Returns the converted amount, the exact exchange rate applied, and the timestamp of the rate. Supports 30+ currencies including USD, EUR, GBP, JPY, CHF,...
Part of the Inferventis — Financial Data, News & Web MCP server.
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AI agents use currency_convert to create or modify resources in Inferventis — Financial Data, News & Web MCP. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call currency_convert repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Inferventis — Financial Data, News & Web MCP.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"currency_convert": {
"limits": [
{
"counter": "currency_convert_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Inferventis — Financial Data, News & Web MCP policy for all 20 tools.
These attack patterns abuse exactly the kind of access currency_convert gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Converts a monetary amount from one currency to another using live exchange rates sourced from the Frankfurter API (European Central Bank data). Returns the converted amount, the exact exchange rate applied, and the timestamp of the rate. Supports 30+ currencies including USD, EUR, GBP, JPY, CHF, AUD, CAD, SEK, NOK, DKK, SGD, HKD, and all major ISO 4217 codes. Use currency_convert when an agent needs to convert prices, invoices, salaries, payments, or any financial figure between fiat currencies in real time with full ECB-backed rate metadata. Prefer currency_convert_lite or currency_fx_lite when only the numeric converted amount and rate are needed without metadata. Use currency_rates when the conversion must use a historical rate from a specific past date. Do not use this tool for cryptocurrency conversion — use crypto_fx_rates (amount conversion via CoinAPI) or crypto_price (spot price lookup via CoinGecko).. It is categorised as a Write tool in the Inferventis — Financial Data, News & Web MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Inferventis — Financial Data, News & Web MCP server in PolicyLayer and add a rule for currency_convert: 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.
currency_convert is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the currency_convert 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 currency_convert. 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.
currency_convert 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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