# Carbon & Cashmere Funding Rate History API

> Carbon & Cashmere Funding Rate History API is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.02/call, status down (last checked 2026-09-08).

Returns historical perpetual funding rate statistics and time-series data for a specified cryptocurrency, including average, max, min, and current rates over a configurable lookback window.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/history/funding/%7Bcoin%7D
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-09-08
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/carbon-cashmere-funding-rate-history-api-6bf007f6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_73p6lkmV-mabSsnMn_Ktk

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-funding-rate-history-api-6bf007f6
```

Example prompt: Pull the 30-day funding rate history for BTC from Carbon & Cashmere — I want to see the average, max, min, and current rates, plus the full 8-hour time series.

## When to prefer this

Use this endpoint when you need historical perpetual funding rate data for a specific cryptocurrency, including aggregate statistics and a time-series breakdown. It is ideal for detecting funding rate anomalies, mean-reversion signals, carry trade analysis, or comparing current rates against historical baselines. Prefer this over general price endpoints when the specific focus is on derivative funding costs rather than spot price.

## Known failure modes

- Unknown or unsupported coin symbol returns an error or empty series
- Malformed coin path parameter causes a 400 or 404 response
- Payment not sent or insufficient USDC causes a 402 payment required error
- Coin has insufficient historical data resulting in fewer samples than expected
- Temporary upstream data unavailability causes a 503 or empty response

## How this service works

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

## Output

A JSON object containing the lookback window in days, aggregate stats (sample count, average rate, max rate, min rate, current rate), and a time-series array of 8-hour funding rate snapshots each with timestamp, raw rate, and annualized percentage — all for the requested coin symbol (e.g. BTCUSDT).

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "days": 30,
  "stats": {
   "samples": 90,
   "avg_rate": 0.00008,
   "max_rate": 0.0003,
   "min_rate": -0.0002,
   "current_rate": 0.0001
  },
  "series": [
   {
    "ts": "2026-04-01T00:00:00Z",
    "rate": 0.0001,
    "annualized_pct": 10.95
   }
  ],
  "symbol": "BTCUSDT",
  "interval": "8h"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-funding-rate-history-api-6bf007f6/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)