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US Treasury Average Interest Rates by Security Type
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US Treasury Average Interest Rates by Security Type is a paid API for AI agents from x402stock.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Returns the average interest rate the US Treasury currently pays on its outstanding debt, broken out by security type (T-Bills, Notes, Bonds, TIPS, FRNs, savings, and aggregates) for the latest reported month.
Price / call$0.01
Success—
StatusUnknown
How this service works
The average interest rate the US Treasury currently pays on its outstanding debt, broken out by security (Treasury Bills, Notes, Bonds, TIPS, FRNs, savings, and the marketable/total aggregates) for the latest reported month, in percent. No ticker needed. A read on the government's cost of borrowing that complements the /treasury-yields curve. Sourced from the US Treasury (FiscalData).
Output
A JSON object containing the latest reported month's average interest rates paid by the US Treasury on its outstanding debt, broken out by security type (Treasury Bills, Notes, Bonds, TIPS, FRNs, savings bonds, and marketable/total aggregates), expressed as percentages, along with the record date, as_of date, source attribution, and count of series returned.
Example use cases
Compare borrowing costs across debt instruments
“I need to understand how much interest the US government is paying on Treasury Bills versus longer-term Bonds right now. Can you show me the average rates for each so I can see the cost difference?”
Monitor inflation-protected securities rates
“What's the average interest rate the Treasury is currently paying on TIPS? I want to track how much yield investors are getting on inflation-protected securities.”
Analyze total government debt service burden
“Give me a complete breakdown of what it's costing the US government to service its debt this month. I need the average rates across all security types — Bills, Notes, Bonds, TIPS, FRNs, and the overall weighted average.”
Technical details
Endpoint
GEThttps://x402stock.xyz/api/v1/avg-interest-ratesWhen to prefer
Use this endpoint when you need the US government's actual average cost of borrowing broken down by debt instrument type (Bills, Notes, Bonds, TIPS, FRNs). It complements Treasury yield curve endpoints (which show market rates) by showing the weighted average rate on all outstanding debt — useful for fiscal analysis, debt cost monitoring, and macro research. Prefer this over yield-curve endpoints when the question is about what the government is actually paying, not what the market currently prices new debt at.
Side effects
- Data not yet refreshed for current month — record_date may lag by several weeks
- avg_interest_rate field may be null for certain security types if Treasury has not reported
- Service unavailable or payment not processed (402 Payment Required)
- Rate limiting or upstream FiscalData API outage causing delayed or stale data
Input
{
"properties": ""
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
{
"unit": "percent",
"as_of": "2026-05-31T00:00:00.000Z",
"count": 16,
"rates": [
{
"security": "Treasury Bills",
"security_type": "Marketable",
"avg_interest_rate": 3.69
},
{
"security": "Treasury Notes",
"security_type": "Marketable",
"avg_interest_rate": 3.248
},
{
"security": "Treasury Bonds",
"security_type": "Marketable",
"avg_interest_rate": 3.413
},
{
"security": "Treasury Inflation-Protected Securities (TIPS)",
"security_type": "Marketable",
"avg_interest_rate": 1.079
},
{
"security": "Treasury Floating Rate Notes (FRN)",
"security_type": "Marketable",
"avg_interest_rate": 3.563
},
{
"security": "Federal Financing Bank",
"security_type": "Marketable",
"avg_interest_rate": 2.389
},
{
"security": "Total Marketable",
"security_type": "Marketable",
"avg_interest_rate": 3.386
},
{
"security": "Domestic Series",
"security_type": "Non-marketable",
"avg_interest_rate": 7.577
},
{
"security": "Special Purpose Vehicle",
"security_type": "Non-marketable",
"avg_interest_rate": 2.781
},
{
"security": "State and Local Government Series",
"security_type": "Non-marketable",
"avg_interest_rate": 3.324
},
{
"security": "United States Savings Securities",
"security_type": "Non-marketable",
"avg_interest_rate": 3.169
},
{
"security": "United States Savings Inflation Securities",
"security_type": "Non-marketable",
"avg_interest_rate": 4.383
},
{
"security": "Government Account Series",
"security_type": "Non-marketable",
"avg_interest_rate": 3.194
},
{
"security": "Government Account Series Inflation Securities",
"security_type": "Non-marketable",
"avg_interest_rate": 1.349
},
{
"security": "Total Non-marketable",
"security_type": "Non-marketable",
"avg_interest_rate": 3.201
},
{
"security": "Total Interest-bearing Debt",
"security_type": "Interest-bearing Debt",
"avg_interest_rate": 3.353
}
],
"series": "avg_interest_rates",
"source": "us_treasury",
"record_date": "2026-05-31"
}Schema · Response
{
"type": "json",
"example": {
"unit": "percent",
"as_of": "2026-05-31T00:00:00.000Z",
"count": 16,
"rates": [
{
"security": "Treasury Bills",
"security_type": "Marketable",
"avg_interest_rate": 3.69
},
{
"security": "Treasury Notes",
"security_type": "Marketable",
"avg_interest_rate": 3.248
},
{
"security": "Treasury Bonds",
"security_type": "Marketable",
"avg_interest_rate": 3.413
},
{
"security": "Total Marketable",
"security_type": "Marketable",
"avg_interest_rate": 3.386
},
{
"security": "Total Interest-bearing Debt",
"security_type": "Interest-bearing Debt",
"avg_interest_rate": 3.353
}
],
"series": "avg_interest_rates",
"source": "us_treasury",
"record_date": "2026-05-31"
}
}Tags
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