# US Treasury Average Interest Rates by Security Type

> US Treasury Average Interest Rates by Security Type is a paid API for AI agents from agent402.tools, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-16).

Returns the latest average interest rates the US Treasury is paying, broken down by security type (Bills, Notes, Bonds, TIPS, FRNs, marketable vs non-marketable).

## Facts

- Endpoint: GET https://agent402.tools/api/treasury-avg-rates
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/us-treasury-average-interest-rates-by-security-type-b31703af
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NmHnO5fLT-2StBpH8uZKo

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability us-treasury-average-interest-rates-by-security-type-b31703af
```

Example prompt: What average interest rates is the US Treasury currently paying on its Bills, Notes, Bonds, TIPS, and FRNs — both marketable and non-marketable — for the most recent reporting month?

## When to prefer this

Use this endpoint when you need a quick, no-parameter lookup of the current average interest rates the US Treasury pays on its debt obligations, broken down by all major security types. Ideal for macroeconomic analysis, fixed income research, or any workflow that needs authoritative government debt cost data without requiring date or filter parameters.

## Known failure modes

- Service unavailable or upstream Treasury data source is down (5xx error)
- Payment failure or insufficient USDC balance (402 error)
- Data not yet updated for the current month — returns prior month's data
- Malformed response if Treasury source changes its data format

## How this service works

Latest average interest rates the US Treasury is paying by security type (Bills, Notes, Bonds, TIPS, FRNs, marketable vs non-marketable). Public domain, no key. No params - returns the most recent reporting month.

## Output

A structured breakdown of the most recent month's average interest rates the US Treasury is paying across security types: Treasury Bills, Notes, Bonds, TIPS (Treasury Inflation-Protected Securities), FRNs (Floating Rate Notes), and totals for marketable vs non-marketable securities.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "rates": [
   {
    "security": "Treasury Notes",
    "securityType": "Marketable",
    "avgInterestRatePct": 2.85
   }
  ],
  "recordDate": "2026-05-31"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/us-treasury-average-interest-rates-by-security-type-b31703af/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent402.tools](https://www.zero.xyz/host/agent402.tools/llms.txt)