# Cryptyx Asset Return Asymmetry Stats

> Cryptyx Asset Return Asymmetry Stats is a paid API for AI agents from www.cryptyx.ai, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns skewness, tail ratio, and 5% expected shortfall for a given crypto asset to identify fat-tailed return distributions.

## Facts

- Endpoint: GET https://www.cryptyx.ai/api/asset/asymmetry
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cryptyx-asset-return-asymmetry-stats-917f3d7d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FJQcJaYNtET-OiaVuc9fo

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 cryptyx-asset-return-asymmetry-stats-917f3d7d
```

Example prompt: What are the return asymmetry stats for BTC — skewness, tail ratio, and expected shortfall — so I can factor in fat-tail risk before sizing my position?

## When to prefer this

Use this endpoint when you need tail-aware risk metrics for a specific crypto asset — particularly skewness and expected shortfall — to inform position sizing, risk-parity overlays, or to screen for fat-tailed assets before entering a trade. Prefer this over generic volatility endpoints when the distributional shape of returns (not just variance) matters.

## Known failure modes

- Missing or invalid symbol parameter returns a 400 error
- Unknown or unsupported asset symbol returns an empty or error response
- Payment not processed (402) blocks access if x402 header is missing or USDC payment fails
- Rate limiting may return 429 if too many calls are made in succession
- Stale data if asset has low trading history or insufficient return data

## How this service works

Returns an ETH-style market asymmetry snapshot for a requested symbol, including funding stress, options skew, liquidity posture, and flow bias with 30-day history and short interpretation. Useful for positioning and market regime analysis.

## Output

A JSON object containing the asset symbol, return skewness score, tail ratio, and expected shortfall at the 5% level (e.g. {"asset":"BTC","skew":0.34,"tail_ratio":1.8,"expected_shortfall":-0.042}).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "symbol"
     ],
     "properties": {
      "symbol": {
       "type": "string",
       "description": "Asset ticker, uppercased and trimmed server-side (e.g. BTC, ETH, SOL)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cryptyx-asset-return-asymmetry-stats-917f3d7d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.cryptyx.ai](https://www.zero.xyz/host/www.cryptyx.ai/llms.txt)