# Carbon Cashmere Open Interest History API

> Carbon Cashmere Open Interest History API is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.05/call, status down (last checked 2026-09-14).

Returns hourly open interest time series for a tracked cryptocurrency across Binance, Bybit, and OKX, with per-exchange breakdown, totals, price, and aggregate stats over up to 60 days.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/history/oi/:coin
- Price: $0.05/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-29b6e658
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6DtVLgXjSD1bPENd4vfqv

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-29b6e658
```

Example prompt: Pull the open interest history for ETH from the Carbon Cashmere OI endpoint — I want to see the hourly Binance, Bybit, and OKX breakdown plus the 30-day change percentage so I can spot any leverage-cycle buildup.

## When to prefer this

Use this endpoint when you need historical open interest data at hourly granularity across Binance, Bybit, and OKX for any of the 34 supported coins. It is ideal for OI divergence detection, leverage cycle analysis, and cross-exchange derivatives flow tracking. Prefer over single-exchange OI sources when cross-exchange comparison is required, and prefer over real-time snapshots when trend or historical context over days to weeks is needed.

## Known failure modes

- Unsupported coin ticker returns 400 or validation error — only the 34 enumerated coins are accepted
- Payment not included or invalid x402 payment header returns 402 Payment Required
- Coin parameter missing from path returns 404 or 400
- Temporary data unavailability for one exchange may result in partial per-exchange data
- Rate limiting or service downtime may return 503

## How this service works

Open Interest time series for any tracked coin across Binance + Bybit + OKX. Hourly buckets up to 60 days. Returns per-exchange breakdown + total + price per bucket. Stats include min/max/avg/current total USD and 30-day change_pct. AI agent API for OI divergence detection, leverage-cycle analysis, and cross-exchange flow tracking.

## Output

A time series of hourly OI buckets for the requested coin covering up to 60 days, with per-exchange (Binance, Bybit, OKX) open interest values, combined total in USD, and spot price per bucket. Also includes aggregate stats: min, max, average, and current total OI in USD, plus a 30-day change percentage.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-29b6e658/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)