# QuantX402 Multi-Asset Market Signal API

> QuantX402 Multi-Asset Market Signal API is a paid API for AI agents from quantx402.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-20).

Returns a blended market forecast for a crypto symbol (BTC-USD, ETH-USD), including directional probability, expected move percent, 80% price band, and invalidation level.

## Facts

- Endpoint: GET https://quantx402.app/api/v1/forecast?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantx402-multi-asset-market-signal-api-480610c1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lr5z_OwKwvxAdotw5YuCY

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 quantx402-multi-asset-market-signal-api-480610c1
```

Example prompt: What's the current hourly market signal for BTC-USD — direction, probability it goes up, expected move percent, and the invalidation level?

## When to prefer this

Choose this endpoint when you need a fast, pre-computed, machine-readable market signal for BTC-USD or ETH-USD that combines directional probability, volatility bands, and invalidation levels in a single call — especially useful for AI trading agents making autonomous decisions or for pre-trade analysis workflows that need structured JSON output rather than raw price data.

## Known failure modes

- Unsupported symbol returns an error — currently only BTC-USD and ETH-USD are live
- Missing required 'symbol' query parameter causes a 400-level error
- Payment failure via x402 (insufficient USDC balance or wallet not set up) blocks the response
- Timeframe enum value other than '1h' may be rejected or ignored
- Stale or unavailable upstream market data may affect forecast freshness

## How this service works

Kronos Forecast: the Kronos candlestick model signal for one symbol and interval as a standard JSON fact list (direction, confidence bucket, volatility-based range, invalidation level, per-step percentiles). Live: BTC-USD, ETH-USD 1h; stocks, forex and commodities rolling out. Experimental, not calibrated. Not financial advice.

## Output

A JSON object containing: symbol (e.g. BTC-USD), prob_up (0–1 probability price moves up), direction (UP or DOWN), band_80_pct (low and high percentage bounds of the 80% confidence price range), expected_move_pct (expected percentage price move), and invalidation_level (price level at which the forecast is considered invalidated).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "symbol"
     ],
     "properties": {
      "tf": {
       "enum": [
        "15m",
        "1h",
        "4h",
        "1d"
       ],
       "type": "string",
       "description": "Candle timeframe"
      },
      "symbol": {
       "enum": [
        "BTC-USD",
        "ETH-USD",
        "SOL-USD",
        "XRP-USD",
        "BNB-USD",
        "DOGE-USD",
        "ADA-USD",
        "AVAX-USD",
        "LINK-USD",
        "SUI-USD"
       ],
       "type": "string",
       "description": "Crypto pair (BTC-USD, ETH-USD, SOL-USD, XRP-USD, BNB-USD, DOGE-USD, ADA-USD, AVAX-USD, LINK-USD, SUI-USD). US stocks & ETFs: /api/v1/stocks/forecast. Any other symbol: /api/v1/forecast/on-demand"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "symbol": "BTC-USD",
  "prob_up": 0.933,
  "_example": "EXAMPLE output for illustration only (captured/synthetic values); not live or current data. Not financial advice.",
  "direction": "UP",
  "band_80_pct": [
   0.39,
   1.418
  ],
  "expected_move_pct": 0.737,
  "invalidation_level": 82954.2
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quantx402-multi-asset-market-signal-api-480610c1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quantx402.app](https://www.zero.xyz/host/quantx402.app/llms.txt)