# Carbon & Cashmere Open Interest History API – SOL

> Carbon & Cashmere Open Interest History API – SOL 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 time-series data for Solana (SOL), including daily OI totals in USD and per-exchange breakdowns with summary statistics.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/history/oi/SOL
- 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-sol-6ded7ee0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HJwAGcQH2MxgKXT4aSIVC

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-sol-6ded7ee0
```

Example prompt: Pull the last 7 days of open interest history for SOL from Carbon & Cashmere — I want to see the daily total OI in USD and how it's changed, including the Binance breakdown.

## When to prefer this

Use this endpoint when you need historical open interest data specifically for Solana (SOL) derivatives markets, broken down by exchange and day. Prefer this over generic price endpoints when analyzing derivatives positioning, momentum, or market structure for SOL. Ideal for quantitative agents tracking OI trends as a signal for directional bias or volatility forecasting.

## Known failure modes

- Invalid coin symbol returns error or empty response
- Missing or expired x402 payment header results in 402 Payment Required
- Request for unsupported coin not tracked by the API returns 404 or empty series
- Network timeout if the data aggregation backend is slow
- Stale data if underlying exchange feeds are delayed

## How this service works

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

## Output

A JSON object containing: the coin ticker (SOL), the number of days covered, summary stats (current total OI in USD and percentage change), and a time-series array of daily data points each with a timestamp, total OI in USD, and per-exchange OI values (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-sol-6ded7ee0/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)