Free tools / US Treasury interest rates
US Treasury average interest rates by security type
Look up the average interest rates on US Treasury securities by month: bills, notes, bonds and inflation-protected securities, from the Treasury's public data.
The result appears here as JSON.One free check per tool and IP address per day. Nothing is stored.
What you get
- Average interest rate by security type for each month
- The record date for every figure
Not returned: Market yields or prices (these are average rates on securities outstanding).
Use it from code or an agent
curl "https://api.ambolt.dev/v1/us-treasury-rates?months=2&free=1"Same tool as an MCP tool (us_treasury_rates, free at 30 requests a minute), as a pay-per-call endpoint ($0.003 a call in USDC) and as an Apify Actor. Reference · Docs
Questions
Are these market yields?
No. They are average interest rates on outstanding securities, published monthly.
How current is it?
The latest month the Treasury has published.
Is this advice?
No. It is reference data.