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Ambolt US Treasury Rates
x402
Ambolt US Treasury Rates is a paid API for AI agents from api.ambolt.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-11).
Returns month-end average interest rates for US Treasury Bills, Notes, and Bonds for up to 24 recent months.
Price / call$0.003
Success—
StatusUnknown
How this service works
Pay-per-call data tools for developers and AI agents: company registers, documents, tenders, rates and on-chain facts as MCP tools, x402 endpoints and Apify Actors.
Output
A JSON object containing an array of monthly records, each with a record date and a list of securities (Treasury Bills, Treasury Notes, Treasury Bonds) with their average interest rates as percentages. Also includes a source attribution string from the US Treasury Fiscal Data and a fetchedAt timestamp.
Example use cases
Fixed income portfolio rate check
“Pull the average interest rates on US Treasury Bills, Notes, and Bonds for the past 12 months so I can review how government borrowing costs have trended.”
Financial model macro assumptions
“What are the most recent month-end US Treasury rates across Bills, Notes, and Bonds? I need the last 3 months for my financial model's risk-free rate assumptions.”
Rate change monitoring dashboard
“Fetch US Treasury interest rates for the last 24 months — I want to see the full two-year history of Bills, Notes, and Bond average rates.”
Technical details
Endpoint
GEThttps://api.ambolt.dev/v1/us-treasury-rates?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need official, sourced US Treasury average interest rates (Bills, Notes, Bonds) for up to 24 recent months, especially in financial modeling, macro analysis, or dashboards requiring government-backed rate data. Prefer it over scraping Treasury websites or using third-party financial data providers when you want a pay-per-call model without a subscription and need data attributed directly to the US Treasury Fiscal Data source.
Side effects
- months parameter out of range (must be 1–24): likely returns a 400 or validation error
- Payment not included or insufficient USDC: returns HTTP 402 Payment Required
- Upstream Treasury Fiscal Data unavailable: may return 503 or stale data
- Invalid query parameter types: schema validation failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "json",
"example": {
"months": [
{
"rates": [
{
"ratePct": 3.788,
"security": "Treasury Bills"
},
{
"ratePct": 3.345,
"security": "Treasury Notes"
},
{
"ratePct": 3.453,
"security": "Treasury Bonds"
}
],
"recordDate": "2026-08-31"
},
{
"rates": [
{
"ratePct": 3.758,
"security": "Treasury Bills"
},
{
"ratePct": 3.309,
"security": "Treasury Notes"
},
{
"ratePct": 3.442,
"security": "Treasury Bonds"
}
],
"recordDate": "2026-07-31"
}
],
"source": "Source: U.S. Department of the Treasury, Fiscal Data (public domain). Average interest rates are month-end averages on outstanding securities, not market yields.",
"fetchedAt": "2026-10-02T21:36:03.043Z"
}
}Tags
x402
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