---
title: "US Treasury Average Interest Rates by Security Type"
method: GET
path: "/v1/us-treasury-rates"
tags: ["US Treasury"]
---

# US Treasury Average Interest Rates by Security Type

`GET /v1/us-treasury-rates`

## Request

- Base URL: `https://api.ambolt.dev`
- URL: `https://api.ambolt.dev/v1/us-treasury-rates`
- Auth: none required

Monthly average interest rates on US Treasury marketable securities (bills, notes, bonds, TIPS, FRNs) Latest months first. Data only, not advice.

## Query parameters

- `months` integer: Number of most recent months.
- `free` '1'

## Response `200`

Result (JSON). Every result names its source and the time it was read.

- object

## Other responses

- `400`: Invalid input; not charged.
- `402`: Payment required: 0.003 USD in USDC (x402 v2).

---

[API](https://skmtc.dev/ambolt/apis/ambolt-data-tools.md) · [All operations](https://skmtc.dev/ambolt/apis/ambolt-data-tools/llms.txt) · [OpenAPI document](https://skmtc.dev/ambolt/apis/ambolt-data-tools/revisions/8397885dd82f?raw)