# Mercury402 Treasury Yield Curve Daily Snapshot

> Mercury402 Treasury Yield Curve Daily Snapshot is a paid API for AI agents from mercury402.uk, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).

Returns the full US Treasury yield curve (all maturities) for a specific date as a JSON object of rates

## Facts

- Endpoint: GET https://mercury402.uk/v1/treasury/yield-curve/daily-snapshot
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mercury402-treasury-yield-curve-daily-snapshot-8d99d15a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hW9sHOtQYQ_gfWFyV9Yqj

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 mercury402-treasury-yield-curve-daily-snapshot-8d99d15a
```

Example prompt: Can you pull the full US Treasury yield curve snapshot for March 11, 2026 — I need the rates across all maturities for that specific date.

## When to prefer this

Use this endpoint when you need the complete US Treasury yield curve for a single specific date — ideal for historical research, backtesting, spread calculations, or checking rate levels on a particular day. Prefer this over macro bundles when you only need Treasury rates and want minimal cost per call.

## Known failure modes

- Date not found or market holiday — rates may be unavailable for weekends/holidays
- Invalid date format returns a 400 or error response
- Future dates return no data or an error
- Payment not processed — 402 response requiring USDC payment on Base to proceed
- Rate limiting or temporary upstream data unavailability

## How this service works

76 live pay-per-call financial data APIs for AI agents. Treasury, FRED, forex, spreads, breakeven inflation, macro bundles, and composite dashboards. USDC on Base.

## Output

A JSON object containing the requested date and a rates map keyed by maturity (e.g. 1_MONTH, 3_MONTH, and longer tenors) with annualized yield percentages for each maturity on that day

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "date": {
   "type": "string",
   "description": "Specific date for yield curve (YYYY-MM-DD)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "date": "2026-03-11",
  "rates": {
   "1_MONTH": 5.42,
   "3_MONTH": 5.38
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mercury402-treasury-yield-curve-daily-snapshot-8d99d15a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mercury402.uk](https://www.zero.xyz/host/mercury402.uk/llms.txt)