# Signal Engine VWAP Reversion Arena Signal – SOL

> Signal Engine VWAP Reversion Arena Signal – SOL 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 2026-09-13).

Returns a real-time VWAP reversion trading signal for SOL, including direction, confidence score, take-profit/stop-loss percentages, and recommended hold time.

## Facts

- Endpoint: GET https://signal-engine-production-d88d.up.railway.app/v1/arena/vwap_reversion/SOL
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signal-engine-vwap-reversion-arena-signal-sol-f6f5422f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2dhy7UmBbaysvuuEo29dK

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-signal-sol-f6f5422f
```

Example prompt: What's the current VWAP reversion signal for SOL — is it a long or short, and what are the take-profit, stop-loss percentages and how long should I hold the position?

## When to prefer this

Use this endpoint when you need a fast, pre-computed algorithmic trading signal specifically for SOL using the VWAP reversion strategy, including actionable take-profit, stop-loss, and hold-time parameters ready for execution. Prefer this over generic price feeds when you need a complete trade recommendation with reasoning, not just raw price data.

## Known failure modes

- Symbol not supported — endpoint is path-specific to SOL; other symbols may return 404
- No signal available — market conditions may not satisfy strategy criteria, returning null or empty signal
- Service unavailable — Railway-hosted service may be down or cold-starting
- Payment required — x402 payment of 0.001 USDC must be included or request returns 402
- Stale data — signal may reflect recently outdated market state during low-liquidity periods

## How this service works

Returns a paid arena signal for VWAP reversion on the selected crypto asset.

## Output

A JSON object containing: signal direction ('long' or 'short'), a confidence score (0–1), take-profit percentage (tp_pct), stop-loss percentage (sl_pct), recommended hold time in seconds, the strategy ID ('vwap_reversion'), strategy name, the symbol, and a natural-language reasoning string explaining the signal.

## 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"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signal-engine-vwap-reversion-arena-signal-sol-f6f5422f/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)