GET
$0.01 default
/api/v1/avg-interest-ratesDescription
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).
Pricing
$0.01 default
Parameters
{
"properties": {},
"type": "object"
}Example response
{
"as_of": "2026-05-31T00:00:00.000Z",
"count": 16,
"rates": [
{
"avg_interest_rate": 3.69,
"security": "Treasury Bills",
"security_type": "Marketable"
},
{
"avg_interest_rate": 3.248,
"security": "Treasury Notes",
"security_type": "Marketable"
},
{
"avg_interest_rate": 3.413,
"security": "Treasury Bonds",
"security_type": "Marketable"
},
{
"avg_interest_rate": 3.386,
"security": "Total Marketable",
"security_type": "Marketable"
},
{
"avg_interest_rate": 3.353,
"security": "Total Interest-bearing Debt",
"security_type": "Interest-bearing Debt"
}
],
"record_date": "2026-05-31",
"series": "avg_interest_rates",
"source": "us_treasury",
"unit": "percent"
}