# Kronos ETH Spot Price (x402)

> Kronos ETH Spot Price (x402) is a paid API for AI agents from kronossignals.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns a multi-source volume-weighted median spot price for Ethereum (ETH) with per-exchange breakdown, confidence rating, and outlier rejection, delivered over the x402 micropayment protocol.

## Facts

- Endpoint: GET https://kronossignals.com/api/v1/price/eth
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kronos-eth-spot-price-x402-60cb49d8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UI9H05vc1Fn4W8adsmyrP

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 kronos-eth-spot-price-x402-60cb49d8
```

Example prompt: What's the current Ethereum price right now? I want the volume-weighted median across multiple exchanges with a confidence score and the per-exchange breakdown.

## When to prefer this

Choose this endpoint when you need a manipulation-resistant, aggregated Ethereum spot price sourced from multiple top exchanges (Binance, Coinbase, Kraken, OKX) with volume weighting, outlier rejection, and a machine-readable confidence score. Prefer it over single-exchange feeds when spread awareness and cross-exchange validation matter, and when you are already operating in an x402 micropayment environment making per-call cost trivial.

## Known failure modes

- Payment not received or malformed x402 payment header — returns 402 Payment Required
- Invalid or unsupported asset path — returns 404 or error body
- Exchange data feeds temporarily unavailable — may return lower confidence or stale data
- Network timeout to upstream exchanges — may increase data_age_seconds
- Rate limiting or provider outage — returns 5xx error

## How this service works

Paid market-intelligence API over x402

## Output

A JSON object containing: volume-weighted median ETH price, timestamp (as_of), asset identifier, array of contributing exchanges each with their price, volume, volume weight, and inclusion flag, overall confidence label (e.g. high), simple median price, cross-exchange spread percentage, number of outliers rejected, data age in seconds, and a disclaimer.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "as_of": "2026-07-02T10:00:00.000Z",
  "asset": "BTC-USD",
  "price": 107500,
  "sources": [
   {
    "price": 107510,
    "volume": 1200000000,
    "exchange": "binance",
    "included": true,
    "vol_weight": 0.45
   },
   {
    "price": 107490,
    "volume": 800000000,
    "exchange": "coinbase",
    "included": true,
    "vol_weight": 0.3
   },
   {
    "price": 107500,
    "volume": 400000000,
    "exchange": "kraken",
    "included": true,
    "vol_weight": 0.15
   },
   {
    "price": 107480,
    "volume": 270000000,
    "exchange": "okx",
    "included": true,
    "vol_weight": 0.1
   }
  ],
  "confidence": "high",
  "disclaimer": "Volume-weighted median price from up to 4 exchanges. Informational only, not financial advice.",
  "data_age_seconds": 0,
  "outliers_rejected": 0,
  "price_simple_median": 107480,
  "cross_exchange_spread_pct": 0.08
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kronos-eth-spot-price-x402-60cb49d8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kronossignals.com](https://www.zero.xyz/host/kronossignals.com/llms.txt)