getCurrencyVolatility
Returns the latest realised volatility for a currency pair, with optional window, method and annualisation. For a time series use /currencyvolatilityhistorical.
This record as markdown: /tools/com-api-ninjas-mcp/getcurrencyvolatility.md
What getCurrencyVolatility does on API Ninjas
AI agents call getCurrencyVolatility to retrieve information from API Ninjas 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 |
|---|---|---|---|
pair | string | Yes | Currency pair in ABC_DEF form (e.g. EUR_USD). Both must be supported fiat currency codes; ZWG, BTC, and XAG are not supported. |
method | string | — | Volatility method: close_to_close (default) or ewma. |
window | integer | — | Lookback window for realized volatility, in trading days. Defaults to 30. Must be between 2 and 1000. |
day_count | integer | — | Annualization factor: 252 trading days (default) or 365 calendar days. |
annualized | boolean | — | Whether to treat the annualized figure as the headline value. Defaults to true. |
Parameters from the server's own tool schema.
Why getCurrencyVolatility is rated Low
Even though getCurrencyVolatility only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs getCurrencyVolatility safely
PolicyLayer is an MCP gateway: it sits between your AI agents and API Ninjas, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For getCurrencyVolatility, this is the rule to start with:
getCurrencyVolatility is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect API Ninjas, apply this rule, and every getCurrencyVolatility call is checked against it from then on.
Questions about getCurrencyVolatility
Returns the latest realised volatility for a currency pair, with optional window, method and annualisation. For a time series use /currencyvolatilityhistorical. It is categorised as a Read tool in the API Ninjas MCP Server, which means it retrieves data without modifying state.
getCurrencyVolatility accepts 5 parameters: pair, method, window, day_count, annualized. Required: pair. The full parameter table on this page comes from the server's own tool schema.
Register the API Ninjas MCP server in PolicyLayer and add a rule for getCurrencyVolatility: 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 API Ninjas. Nothing to install.
getCurrencyVolatility 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 getCurrencyVolatility 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 getCurrencyVolatility. 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.
getCurrencyVolatility is provided by the API Ninjas MCP server (https://mcp.api-ninjas.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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