# Market Intelligence API – US Yield Curve & Rates

> Market Intelligence API – US Yield Curve & Rates is a paid API for AI agents from api.marketintelligenceapi.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).

Returns the US Treasury par and TIPS yield curve, key spread slopes (2s10s, 3m10y, 5s30s), inversion flags, 10-year breakeven inflation, and overnight rates (SOFR, EFFR, €STR) with daily changes.

## Facts

- Endpoint: GET https://api.marketintelligenceapi.com/api/v1/rates/curve?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/market-intelligence-api-us-yield-curve-rates-0f52ac73
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nFzW3VY1Ww-HTablWzCdr

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 market-intelligence-api-us-yield-curve-rates-0f52ac73
```

Example prompt: What does the US yield curve look like right now — give me the Treasury yields across maturities, today's 2s10s and 3m10y spreads, whether the curve is inverted, the 10-year breakeven inflation, and the latest SOFR and euro STR overnight rates.

## When to prefer this

Use this endpoint when an agent needs the full interest-rate macro backdrop in a single call — especially for pre-trade context, macro regime detection, or monitoring yield curve inversions. Prefer over generic financial data APIs when you specifically need structured slope metrics, inversion flags, and overnight benchmark rates (SOFR, EFFR, €STR) together with the Treasury curve in one low-latency, pay-per-call response.

## Known failure modes

- Market holiday or weekend — yields may be stale or return previous business day data
- Upstream data feed delay — response may reflect prior day's close
- Network timeout — endpoint returns HTTP error if upstream data provider is unavailable
- Rate data unavailable for specific maturity — field may be null or omitted in response

## How this service works

US Treasury yields and yield curve: par and real (TIPS) curves with daily changes, 2s10s/3m10y/5s30s slopes and inversion flags, 10y breakeven inflation, and SOFR, EFFR and euro STR. Use for the interest-rate backdrop of any trade.

## Output

A JSON object containing: today's date, nominal Treasury yields at key maturities (3M, 2Y, 10Y, 30Y) in percent, yield curve slope metrics in basis points (2s10s, 3m10y, 5s30s), boolean inversion flags for each slope, 10-year TIPS-derived breakeven inflation in percent, and overnight reference rates (SOFR with effective date, euro STR).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "description": "Example JSON response returned by this endpoint"
    }
   },
   "additionalProperties": true
  }
 },
 "additionalProperties": false
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "date": "2026-09-24",
  "overnight": {
   "ESTR": {
    "ratePercent": 2.44
   },
   "SOFR": {
    "ratePercent": 3.87,
    "effectiveDate": "2026-09-23"
   }
  },
  "slopesBps": {
   "2s10s": 31,
   "3m10y": 94
  },
  "inversions": {
   "2s10s": false,
   "3m10y": false
  },
  "nominalYieldsPercent": {
   "2 Yr": 4.87,
   "3 Mo": 4.24,
   "10 Yr": 5.18,
   "30 Yr": 5.47
  },
  "breakevenInflation10yPercent": 2.33
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/market-intelligence-api-us-yield-curve-rates-0f52ac73/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.marketintelligenceapi.com](https://www.zero.xyz/host/api.marketintelligenceapi.com/llms.txt)