# Carbon & Cashmere News Reaction Time API – ETH

> Carbon & Cashmere News Reaction Time API – ETH 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 statistics on how quickly Ethereum's price reacts to news events, including median seconds-to-move, reaction rates, and recent news samples with price impact data.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/news-reaction-time/ETH
- 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/carbon-cashmere-news-reaction-time-api-eth-7471d8a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7cfFgkdBc1vCVeAKzwG_k

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-news-reaction-time-api-eth-7471d8a0
```

Example prompt: Pull the Carbon & Cashmere news reaction time stats for ETH — I want to see the median and P75 seconds-to-move, the overall reaction rate, and a few recent examples of high-impact news events that moved the price, looking back 14 days with a 6-hour reaction window.

## When to prefer this

Use this endpoint when you need to understand how quickly and reliably the ETH market price responds to news events — especially useful for building news-driven trading signals, backtesting news-reaction strategies, or assessing the speed advantage needed to trade on crypto news. Prefer this over generic price APIs when the specific question is about news-to-price latency or reaction rate distributions.

## Known failure modes

- Invalid or unsupported coin symbol returns 404 or empty result
- Rate limiting or payment failure (x402) returns 402 Payment Required
- Insufficient historical data for the requested lookback window may return sparse stats
- Network timeout if upstream news/price data sources are unavailable
- Invalid filter parameter values (e.g. negative lookback_days) may 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), aggregate reaction statistics (total news count, reaction rate, seconds-to-move distribution with min/max/p25/p75/median, and count that reacted within window), applied filter parameters (sentiment, min_impact, lookback_days, time_window_hours, move_threshold_pct), and an array of recent news samples each with timestamp, headline, source, sentiment, impact level, price at news time, first move percentage, and seconds to move.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "coin": "BTC",
  "stats": {
   "news_total": 412,
   "reaction_rate": 0.696,
   "seconds_to_move": {
    "max": 21540,
    "min": 60,
    "p25": 720,
    "p75": 5400,
    "median": 1842
   },
   "reacted_within_window": 287
  },
  "filter": {
   "sentiment": null,
   "min_impact": null,
   "lookback_days": 14,
   "time_window_hours": 6,
   "move_threshold_pct": 0.005
  },
  "recent_samples": [
   {
    "ts": "2026-05-09T14:32:00Z",
    "title": "Bitcoin ETF inflows hit record",
    "source": "CoinDesk",
    "sentiment": "positive",
    "impact_level": "HIGH",
    "price_at_news": 79500,
    "first_move_pct": 0.00712,
    "seconds_to_move": 480
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-news-reaction-time-api-eth-7471d8a0/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)