# Carbon & Cashmere News Reaction Time API – BTC

> Carbon & Cashmere News Reaction Time API – BTC 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 statistical analytics on how quickly BTC price moves in response to news events, including reaction rates, time-to-move distributions, and recent news-price sample data.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/news-reaction-time/BTC
- 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-btc-3b097aeb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O4s64JJj2ZtOOw4VInX--

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-btc-3b097aeb
```

Example prompt: Can you pull the news reaction time stats for BTC — I want to know the median seconds it takes for Bitcoin price to move after a news event and what percentage of news events trigger a move, using a 6-hour time window and 0.5% move threshold over the last 14 days?

## When to prefer this

Choose this endpoint when you need quantitative statistics on how quickly and how often Bitcoin price reacts to news events — particularly for building news-driven trading signals, backtesting news-reaction strategies, or understanding the typical latency between news publication and price movement. Prefer this over generic price endpoints when the research question is specifically about news-to-price causality and timing distributions.

## Known failure modes

- Unsupported coin symbol returns 404 or empty result
- Invalid filter parameter values (e.g. negative lookback_days) return 400 bad request
- Insufficient historical data for the specified lookback window returns sparse or empty stats
- Payment failure via x402 protocol blocks access and returns 402 Payment Required
- Rate limiting or quota exhaustion returns 429 Too Many Requests

## How this service works

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

## Output

A JSON object containing the coin symbol, aggregated reaction statistics (total news events, reaction rate, min/max/median/p25/p75 seconds to move, count reacted within window), the active filter parameters, and an array of recent news samples each with timestamp, headline, source, sentiment, impact level, price at news, 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-btc-3b097aeb/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)