# Carbon & Cashmere Open Interest History API — ETH

> Carbon & Cashmere Open Interest History API — ETH is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.02/call, status down (last checked 2026-09-13).

Returns historical open interest (OI) time-series data for Ethereum, including daily total OI in USD, per-exchange breakdowns, and summary change statistics

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/history/oi/ETH
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/carbon-cashmere-open-interest-history-api-eth-d54457d3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QgKs2Wn-mmfVu7MKJy8pu

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 carbon-cashmere-open-interest-history-api-eth-d54457d3
```

Example prompt: Pull the last 7 days of Ethereum open interest history from Carbon & Cashmere — I want to see the daily total OI in USD and how much it's changed over the period.

## When to prefer this

Use this endpoint when you need historical open interest time-series data specifically for ETH (Ethereum) futures/derivatives markets, particularly when you want daily granularity, per-exchange breakdowns, and change-percentage summaries. Prefer this over generic price endpoints when the analytical goal is derivatives positioning, leverage buildup detection, or OI-driven market signals rather than spot price.

## Known failure modes

- Invalid or unsupported coin symbol returns error or empty series
- Missing payment / insufficient USDC balance triggers 402 Payment Required
- Rate limit exceeded returns 429 Too Many Requests
- Network timeout if upstream exchange data is unavailable
- Malformed query parameters return 400 Bad Request

## How this service works

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

## Output

A JSON object containing the coin identifier (ETH), the requested lookback window in days, summary stats (total OI change percent, current total OI in USD), and a time-series array of daily OI snapshots with timestamps, total OI USD, and per-exchange OI USD (e.g. Binance).

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "coin": "BTC",
  "days": 7,
  "stats": {
   "change_pct": 2.1,
   "current_total_usd": 111000000000
  },
  "series": [
   {
    "ts": "2026-04-11T00:00:00Z",
    "total_oi_usd": 108500000000,
    "binance_oi_usd": 52000000000
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-open-interest-history-api-eth-d54457d3/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)