getCurrencyVolatilityHistorical

Returns a realised volatility time series for a currency pair across a date range or days lookback. For the latest single value use /currencyvolatility.

SERVERAPI Ninjas SOURCEhttps://mcp.api-ninjas.com/mcp

Low RISK CLASS

Category Read

Parameters 81 required

Recommended Allowedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/com-api-ninjas-mcp/getcurrencyvolatilityhistorical.md

WHAT IT DOES

What getCurrencyVolatilityHistorical does on API Ninjas

AI agents call getCurrencyVolatilityHistorical 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
`days`	integer	—	Length of the trailing date range in calendar days, ending today. Defaults to 90. Maximum 1825. Mutually exclusive with start_date/end_date.
`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.
`end_date`	string	—	End date (YYYY-MM-DD) for a range query. Use with start_date instead of days.
`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.
`start_date`	string	—	Start date (YYYY-MM-DD) for a range query. Use with end_date instead of days.

Parameters from the server's own tool schema.

RISK

Why getCurrencyVolatilityHistorical is rated Low

Even though getCurrencyVolatilityHistorical 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

RECOMMENDED RULE

The rule that runs getCurrencyVolatilityHistorical 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 getCurrencyVolatilityHistorical, this is the rule to start with:

getCurrencyVolatilityHistorical Allowed

getCurrencyVolatilityHistorical is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect API Ninjas, apply this rule, and every getCurrencyVolatilityHistorical call is checked against it from then on.

FAQ

Questions about getCurrencyVolatilityHistorical

What does the getCurrencyVolatilityHistorical tool do? +

Returns a realised volatility time series for a currency pair across a date range or days lookback. For the latest single value use /currencyvolatility. It is categorised as a Read tool in the API Ninjas MCP Server, which means it retrieves data without modifying state.

What parameters does getCurrencyVolatilityHistorical accept? +

getCurrencyVolatilityHistorical accepts 8 parameters: days, pair, method, window, end_date, day_count, annualized, start_date. Required: pair. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on getCurrencyVolatilityHistorical? +

Register the API Ninjas MCP server in PolicyLayer and add a rule for getCurrencyVolatilityHistorical: 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.

What risk level is getCurrencyVolatilityHistorical? +

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

Can I rate-limit getCurrencyVolatilityHistorical? +

Yes. Add a rate_limit block to the getCurrencyVolatilityHistorical 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 getCurrencyVolatilityHistorical completely? +

Set action: deny in the PolicyLayer policy for getCurrencyVolatilityHistorical. 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 getCurrencyVolatilityHistorical? +

getCurrencyVolatilityHistorical 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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