# Carbon & Cashmere Mantis Realized Accuracy Signal API

> Carbon & Cashmere Mantis Realized Accuracy Signal API is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-08).

Returns backtested signal accuracy statistics and recent prediction samples for a given crypto asset over the last 30 days, including hit rate, predicted directions, and 4-hour return distributions.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/mantis-realized-accuracy/%7Basset%7D
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-08
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/carbon-cashmere-mantis-realized-accuracy-signal-api-c0255307
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KfZbrfmjzSchTnTdNs2hT

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-mantis-realized-accuracy-signal-api-c0255307
```

Example prompt: Pull the Carbon & Cashmere mantis realized accuracy stats for AAVE — I want to see the hit rate, how many predictions went up vs down, and the most recent sample predictions with actual versus predicted direction.

## When to prefer this

Use this endpoint when you need to audit or validate the historical accuracy of the Carbon & Cashmere directional signal for a specific crypto asset before acting on it, or when building a signal reliability dashboard. Prefer this over the full bundle endpoint when you specifically need backtested prediction stats and sample-level detail rather than live ML probabilities or regime scoring.

## Known failure modes

- Unknown or unsupported asset symbol returns 404 or empty data
- Asset with insufficient prediction history returns minimal or null stats fields
- Network timeout or service unavailability returns 5xx error
- Payment not processed (x402 protocol failure) results in 402 Payment Required
- Malformed asset path parameter returns 400 Bad Request

## How this service works

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

## Output

A JSON object with the asset name, a stats block containing hit count, hit rate, predicted up/down counts, predictions total, classifiable prediction count, and abs_return_4h_pct percentiles (p75, p95, median), a filter block showing the 30-day lookback window, and an array of recent_samples each with timestamp, hit flag, 4h return, price at prediction, price 4h later, multixsec value, and actual/predicted direction labels.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "asset": "AAVE",
  "stats": {
   "hits": 1256,
   "hit_rate": 0.5322,
   "predicted_up": 1183,
   "predicted_down": 1188,
   "abs_return_4h_pct": {
    "p75": 1.124,
    "p95": 2.83,
    "median": 0.5358
   },
   "predictions_total": 2371,
   "predictions_classifiable": 2360
  },
  "filter": {
   "lookback_days": 30
  },
  "recent_samples": [
   {
    "ts": "2026-05-09T20:00:00Z",
    "hit": 1,
    "return_4h": 0.00647,
    "price_at_pred": 95.81,
    "price_4h_later": 96.43,
    "multixsec_value": 0.6234,
    "actual_direction": "up",
    "predicted_direction": "up"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-mantis-realized-accuracy-signal-api-c0255307/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)