# US Treasury Par Yield Curve Data

> US Treasury Par Yield Curve Data is a paid API for AI agents from d1x8xrm7jrzkbs.cloudfront.net, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Returns the current month's US Treasury daily par yield curve rates in normalized JSON format, with date and tenor columns in percent.

## Facts

- Endpoint: GET https://d1x8xrm7jrzkbs.cloudfront.net/data/us-treasury/par-yield-curve.json
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/us-treasury-par-yield-curve-data-4f7d1538
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BBaJR60ClUEgOm40ssvZr

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-par-yield-curve-data-4f7d1538
```

Example prompt: Can you pull the current US Treasury par yield curve data — I need today's rates across all tenors in JSON format for my bond pricing model.

## When to prefer this

Choose this endpoint when you need structured, normalized US Treasury par yield curve data for the current month in JSON, ready to use in financial models, bond pricing, or interest rate analysis. It is particularly suited for AI agent workflows that need programmatic access to daily Treasury rates without scraping the Treasury website, and where micro-payment per call via USDC/x402 is acceptable. Prefer this over raw Treasury XML/CSV sources when you need clean JSON output with minimal processing.

## Known failure modes

- Payment not settled — 402 response if USDC payment via x402 protocol is not included or fails
- Data unavailable — Treasury may not publish curve data on weekends/holidays, resulting in empty or partial dataset
- Format error — only 'json' is supported as format; other values may be rejected
- Stale data — current month data may be incomplete if queried early in the month
- Network/CDN error — CloudFront distribution may be temporarily unavailable

## How this service works

Pay-per-request datasets and Amazon Bedrock inference for AI agents, settled in USDC over the x402 protocol on Base.

## Output

A JSON object containing the US Treasury daily par yield curve for the current month, with rows keyed by date and columns for each tenor (e.g. 1-month, 3-month, 6-month, 1-year, 2-year, 5-year, 10-year, 30-year), all expressed as percentages.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "format": {
   "enum": [
    "json"
   ],
   "type": "string",
   "description": "Response format; only json is supported"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "description": "US Treasury daily par yield curve for the current month, normalized JSON (date + tenor columns in percent)"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/us-treasury-par-yield-curve-data-4f7d1538/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
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