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Mercury402 Treasury Yield Curve Historical Data
x402
Mercury402 Treasury Yield Curve Historical Data is a paid API for AI agents from mercury402.uk, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Returns historical US Treasury yield curve data for a specified date range
Price / call$0.05
Success—
StatusUnknown
How this service works
76 live pay-per-call financial data APIs for AI agents. Treasury, FRED, forex, spreads, breakeven inflation, macro bundles, and composite dashboards. USDC on Base.
Output
A JSON object containing an array of historical yield curve data points indexed by date, along with the start_date and end_date of the requested range. Each data entry represents Treasury yields across maturities for that period.
Example use cases
Example prompt
“Can you pull the historical US Treasury yield curve data from January 1, 2024 through March 31, 2024 so I can see how rates evolved across the curve over that quarter?”
Technical details
Endpoint
POSThttps://mercury402.uk/v1/treasury/yield-curve/historicalWhen to prefer
Use this endpoint when you need historical US Treasury yield curve data for a specific date range — ideal for macro analysis, backtesting, interest rate modeling, or studying yield curve inversion/steepening events. Prefer this over real-time endpoints when analyzing past rate environments or doing quantitative research across a window of time.
Side effects
- Invalid or malformed date format returns error
- start_date after end_date causes bad request
- Date range too large may return empty or partial data
- Payment not included or insufficient USDC causes 402 rejection
- No data available for future or very old dates returns empty array
Output
Schema · Response
{
"type": "json",
"example": {
"data": [],
"end_date": "2024-03-31",
"start_date": "2024-01-01"
}
}Tags
x402
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