# Carbon & Cashmere Oracle Consensus (ETH) — 3-Way Price Aggregation

> Carbon & Cashmere Oracle Consensus (ETH) — 3-Way Price Aggregation 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).

Fetches a 3-way oracle consensus price for ETH, aggregating DIA, Pyth, and CoinGecko with spread analysis and outlier detection.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/oracle-consensus-3way/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-oracle-consensus-eth-3-way-price-aggregation-098a5d72
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CW5qIZqxV-i27m3FY8Xvc

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-oracle-consensus-eth-3-way-price-aggregation-098a5d72
```

Example prompt: Pull the 3-way oracle consensus price for ETH right now — I want to see the mean, median, and whether any of the sources like CoinGecko or Pyth is an outlier with significant deviation.

## When to prefer this

Use this endpoint when you need a cross-validated ETH spot price with built-in outlier detection and spread analysis across three independent oracles (DIA, Pyth, CoinGecko). Prefer it over single-source price feeds when data integrity and oracle divergence detection matter, such as in DeFi risk checks, arbitrage detection, or when a trustworthy reference price is needed for settlement or display.

## Known failure modes

- One or more oracle sources unavailable — partial result or error returned
- Coin symbol not supported — 404 or empty response
- Payment not provided or insufficient — 402 Payment Required
- Rate limit exceeded — 429 response
- Network timeout from upstream oracle — stale or missing data

## How this service works

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

## Output

Returns a JSON object with per-source prices (DIA, Pyth, CoinGecko) and timestamps, a consensus block with mean, median, max spread percentage, and any identified outlier with its deviation in percent and USD, plus pairwise spread percentages between all three source pairs.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "coin": "BTC",
  "sources": [
   {
    "ts": "2026-05-09T21:31:56Z",
    "name": "DIA",
    "price": 80790.02
   },
   {
    "ts": "2026-05-09T21:25:03Z",
    "name": "Pyth",
    "price": 80785.39,
    "confidence": 19.22
   },
   {
    "ts": "2026-05-09T21:25:00Z",
    "name": "CoinGecko",
    "price": 80812
   }
  ],
  "consensus": {
   "outlier": {
    "name": "CoinGecko",
    "deviation_pct": 0.027,
    "deviation_abs_usd": 21.98
   },
   "mean_usd": 80795.8,
   "median_usd": 80790.02,
   "max_spread_pct": 0.033
  },
  "pairwise_spreads": [
   {
    "a": "DIA",
    "b": "Pyth",
    "spread_pct": 0.0057
   },
   {
    "a": "DIA",
    "b": "CoinGecko",
    "spread_pct": -0.0272
   },
   {
    "a": "Pyth",
    "b": "CoinGecko",
    "spread_pct": -0.0329
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-oracle-consensus-eth-3-way-price-aggregation-098a5d72/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)