# 2s Yield Curve API

> 2s Yield Curve API is a paid API for AI agents from 2s.io, paid per call via x402, $0.00144/call, status unknown (last checked 2026-10-10).

Returns the current US Treasury yield curve with yields across all maturities, inversion status, and key spreads (2s10s, 3m10y) sourced from FRED.

## Facts

- Endpoint: GET https://2s.io/api/econ/yield-curve?utm_source=zero.xyz
- Price: $0.00144/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/2s-yield-curve-api-a45c7dd6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Dxj5xSHkBpaRBb5QSJHyp

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 2s-yield-curve-api-a45c7dd6
```

Example prompt: What does the US Treasury yield curve look like right now — is it inverted, and what are the 2s10s and 3-month-to-10-year spreads?

## When to prefer this

Use this endpoint when you need a complete, current snapshot of the US Treasury yield curve with inversion status and key spread metrics in a single call, sourced authoritatively from FRED. Prefer over scraping Treasury.gov or building your own FRED integration. Ideal for macroeconomic analysis, recession signal detection, and fixed-income context in AI agent workflows.

## Known failure modes

- FRED data unavailable or delayed — stale as-of date returned
- Network timeout reaching upstream FRED source
- Payment not fulfilled via x402 — 402 response with no data
- Malformed response if upstream FRED API changes schema

## How this service works

The (most) everything API: 575+ pay-per-call endpoints for AI agents — ground-truth data, a full AI gateway, and agent infrastructure (storage, queues, watchers). USDC via x402, no signup, no API keys, and upto billing: pay actual usage, not the quote.

## Output

Returns a JSON object with an array of Treasury yield data points (yield %, maturity label, months, FRED series ID, as-of date) covering all standard maturities, plus meta fields: inversion boolean, 2s10s spread, 3m10y spread, and the as-of date. Includes source attribution to FRED/Federal Reserve Bank of St. Louis.

## Example request

```json
{
 "properties": ""
}
```

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/2s-yield-curve-api-a45c7dd6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 2s.io](https://www.zero.xyz/host/2s.io/llms.txt)