# Carbon & Cashmere ETH Orderbook Signal API

> Carbon & Cashmere ETH Orderbook Signal API is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.02/call, status down (last checked 2026-09-03).

Returns real-time ETH orderbook intelligence including spread in basis points, bid/ask wall ratios, and bid-ask imbalance for market microstructure analysis.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/orderbook/ETH
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-09-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/carbon-cashmere-eth-orderbook-signal-api-c0139cfc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fiolRoU536qFN-xTYQMaa

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-eth-orderbook-signal-api-c0139cfc
```

Example prompt: What does the ETH orderbook look like right now — specifically the spread in basis points, how big the bid and ask walls are relative to each other, and whether there's a significant bid-ask imbalance?

## When to prefer this

Use this endpoint when you need real-time ETH-specific orderbook microstructure metrics such as spread, wall ratios, and imbalance — particularly for short-term trading signal generation, market depth monitoring, or detecting large buy/sell pressure events. Prefer this over generic price APIs when orderbook structure (not just price) is needed.

## Known failure modes

- ETH orderbook data unavailable or exchange feed down — may return error or stale data
- Rate limit exceeded if too many calls in rapid succession
- Malformed response if upstream liquidity source is temporarily unreachable
- Invalid coin path returns 404 or empty response

## How this service works

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

## Output

A JSON object with the coin symbol (ETH), spread in basis points (spread_bps), ask wall ratio (ask_wall_ratio), bid wall ratio (bid_wall_ratio), and bid-ask imbalance score — providing a snapshot of ETH orderbook microstructure at the time of the call.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "coin": "BTC",
  "spread_bps": 0.8,
  "ask_wall_ratio": 1.1,
  "bid_wall_ratio": 2.3,
  "bid_ask_imbalance": 0.15
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-eth-orderbook-signal-api-c0139cfc/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)