# Signal Engine VWAP Reversion Arena Strategy Signal – ETH

> Signal Engine VWAP Reversion Arena Strategy Signal – ETH is a paid API for AI agents from signal-engine-production-d88d.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-14).

Returns a VWAP reversion trading strategy signal for the ETH asset in the arena context

## Facts

- Endpoint: GET https://signal-engine-production-d88d.up.railway.app/v1/arena/vwap_reversion/ETH?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signal-engine-vwap-reversion-arena-strategy-signal-eth-8837ac03
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XSSljv0mEvSxH7Q384JmU

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 signal-engine-vwap-reversion-arena-strategy-signal-eth-8837ac03
```

Example prompt: What is the current VWAP reversion arena strategy signal for ETH right now — is it showing a buy, sell, or neutral signal?

## When to prefer this

Choose this endpoint when you need a real-time, quantitative VWAP mean-reversion signal specifically for ETH within a competitive arena trading context. Prefer this over generic price feeds when you need a computed strategy signal rather than raw price data, and when you are operating within a micropayment-enabled (x402) agent workflow.

## Known failure modes

- Asset not supported — returns 404 if the symbol is unavailable
- Strategy not available — 404 if vwap_reversion is not configured
- Service unavailable — 503 or timeout if the signal engine backend is down
- Payment required — 402 if x402 payment header is not included or is invalid
- Rate limit exceeded — 429 if too many requests are made in a short window

## How this service works

Individual arena strategy signal

## Output

A trading signal object indicating the current VWAP reversion signal for ETH, likely including direction (buy/sell/neutral), signal strength or score, and possibly timestamp or confidence metadata.

## Example request

```json
{
 "symbol": "ETH",
 "strategy_id": "vwap_reversion"
}
```

## Request schema (JSON Schema)

```json
{
 "output": {
  "required": [
   "strategy_id",
   "symbol"
  ],
  "properties": {
   "score": {
    "type": "number",
    "maximum": 1,
    "minimum": 0
   },
   "reason": {
    "type": "string",
    "description": "Present when signal is null (e.g. no_signal, no_context)"
   },
   "signal": {
    "enum": [
     "long",
     "short"
    ],
    "type": "string",
    "nullable": true
   },
   "sl_pct": {
    "type": "number",
    "description": "Stop-loss percentage"
   },
   "symbol": {
    "type": "string"
   },
   "tp_pct": {
    "type": "number",
    "description": "Take-profit percentage"
   },
   "reasoning": {
    "type": "string"
   },
   "strategy_id": {
    "type": "string"
   },
   "hold_time_sec": {
    "type": "integer",
    "description": "Suggested hold time in seconds"
   },
   "strategy_name": {
    "type": "string"
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "score": 0.82,
  "signal": "long",
  "sl_pct": 0.008,
  "symbol": "BTC",
  "tp_pct": 0.015,
  "reasoning": "Bollinger band squeeze with volume expansion",
  "strategy_id": "vwap_reversion",
  "hold_time_sec": 300,
  "strategy_name": "VWAP Reversion"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signal-engine-vwap-reversion-arena-strategy-signal-eth-8837ac03/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from signal-engine-production-d88d.up.railway.app](https://www.zero.xyz/host/signal-engine-production-d88d.up.railway.app/llms.txt)