# Carbon Cashmere Open Interest API

> Carbon Cashmere Open Interest API is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.01/call, status down (last checked 2026-09-14).

Returns aggregated open interest across Binance, Bybit, and OKX for up to 27 crypto assets with per-exchange USD values, totals, and 1h/4h/24h percentage change deltas, updated every 5 minutes.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/open-interest
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-carbon-cashmere-de-52ed9478
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VKDWz2cIFeGVi7Zb1YNeH

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 api-carbon-cashmere-de-52ed9478
```

Example prompt: Pull the current open interest data for BTC from Carbon Cashmere — I want to see how OI is split across Binance, Bybit, and OKX right now and whether the 1h and 4h deltas are spiking.

## When to prefer this

Choose this endpoint when you need a fast, multi-exchange aggregated view of crypto derivatives open interest with short-term momentum deltas (1h/4h/24h). It is ideal for detecting leveraged position build-ups, OI divergences between Binance/Bybit/OKX, or sizing analysis for 27 major crypto assets. Prefer this over order book or price endpoints when the specific analytical focus is derivatives market positioning rather than spot price or liquidity depth.

## Known failure modes

- Unsupported coin symbol returns empty or error response
- Coin not in the supported 27-asset universe returns no data
- Stale data if update cycle is delayed beyond 5-minute window
- Rate limiting or payment failure returns 402 or 429
- Missing required method or type fields in request schema causes validation error

## How this service works

Professional crypto market intelligence. Real-time prices, signals, and market scoring.

## Output

Returns a JSON object with the requested coin's open interest broken down per exchange (Binance, Bybit, OKX) in USD, a total aggregated OI figure, and percentage change deltas over 1h, 4h, and 24h windows. The count of records and coin ticker are also included.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "coin": "BTC",
  "data": [
   {
    "symbol": "BTC",
    "delta_1h_pct": 1.2,
    "total_oi_usd": 32500000000,
    "delta_24h_pct": -3.5,
    "binance_oi_usd": 15200000000
   }
  ],
  "count": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-52ed9478/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.carbon-cashmere.de](https://www.zero.xyz/host/api.carbon-cashmere.de/llms.txt)