getTreasuryYieldHistorical

Returns a Treasury yield time series over a date range for the par, real or bill curve, for one maturity or, with premium, the whole curve. For a single day use /treasuryyield.

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

Low RISK CLASS

Category Read

Parameters 50 required

Recommended Allowedsee the rule below

Registry record Grade D, identity unverified Pull the record →

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

WHAT IT DOES

What getTreasuryYieldHistorical does on API Ninjas

AI agents call getTreasuryYieldHistorical 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
`type`	string	—	Curve type: par (default), real, or bill.
`format`	string	—	json (default) or csv.
`end_date`	string	—	End of range (YYYY-MM-DD).
`maturity`	string	—	Single maturity code (e.g. year_10, week_13). Omit for full-curve history (premium).
`start_date`	string	—	Start of range (YYYY-MM-DD).

Parameters from the server's own tool schema.

RISK

Why getTreasuryYieldHistorical is rated Low

Even though getTreasuryYieldHistorical 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 getTreasuryYieldHistorical 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 getTreasuryYieldHistorical, this is the rule to start with:

getTreasuryYieldHistorical Allowed

getTreasuryYieldHistorical 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": {
    "getTreasuryYieldHistorical": {}
  }
}

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 getTreasuryYieldHistorical call is checked against it from then on.

FAQ

Questions about getTreasuryYieldHistorical

What does the getTreasuryYieldHistorical tool do? +

Returns a Treasury yield time series over a date range for the par, real or bill curve, for one maturity or, with premium, the whole curve. For a single day use /treasuryyield. It is categorised as a Read tool in the API Ninjas MCP Server, which means it retrieves data without modifying state.

What parameters does getTreasuryYieldHistorical accept? +

getTreasuryYieldHistorical accepts 5 parameters: type, format, end_date, maturity, start_date. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on getTreasuryYieldHistorical? +

Register the API Ninjas MCP server in PolicyLayer and add a rule for getTreasuryYieldHistorical: 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 getTreasuryYieldHistorical? +

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

Can I rate-limit getTreasuryYieldHistorical? +

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

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

getTreasuryYieldHistorical 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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