# 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, $0.03/call, status unknown (last checked 2026-10-20).

Returns a blended directional market signal (stance, odds, sentiment, invalidation level) for a crypto symbol by combining Kronos AI forecasts with market data, volatility, and prediction-market inputs.

## Facts

- Endpoint: GET https://quantx402.app/api/v1/signal?utm_source=zero.xyz
- Price: $0.03/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-ce0b03df
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_s3BlpE3RxaLJdjbmd4bRK

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-ce0b03df
```

Example prompt: What's the current Kronos market signal for BTC-USD — is there a lean up or down edge, and what's the odds_up probability and invalidation level right now?

## When to prefer this

Choose this endpoint when you need a single pre-blended directional signal for Bitcoin or Ethereum that fuses AI forecasting (Kronos), volatility, prediction-market odds, and sentiment into one JSON payload — rather than calling separate data sources and synthesizing yourself. Ideal for trading bots, signal dashboards, or AI agents that need a quick actionable stance with an invalidation level, especially when you want Kronos-specific path probability (odds_up) rather than a generic price feed.

## Known failure modes

- Unsupported symbol — only BTC-USD and ETH-USD are live; stocks/forex return errors or empty
- Payment not processed — x402 payment failure results in 402 response and no signal data
- Unsupported timeframe — only '1h' is currently accepted; other values are rejected
- Stale or unavailable market data — signal may return NO_EDGE when underlying data is insufficient
- Rate limiting — high-frequency callers may be throttled after repeated rapid calls

## How this service works

Signal Blend: one merged multi-source fact list per symbol: Kronos signal + market data (momentum, volatility range, invalidation check) with a stance and plain-English reasons, plus a prediction_markets block: nearest-dated Polymarket "above $X" market prices next to an experimental model view of our volatility-based range (not odds). News/sentiment inputs rolling out. Experimental. Not financial advice.

## Output

A JSON object containing: stance (LEAN_UP, LEAN_DOWN, or NO_EDGE), symbol, odds_up (0–1 probability of price finishing higher), agreement (ALIGNED, OPPOSED, or MIXED between forecast and sentiment), sentiment value, invalidation_level (price level at which the signal is invalidated), and a reasons array of plain-English explanations.

## 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": {
  "stance": "LEAN_UP | LEAN_DOWN | NO_EDGE",
  "symbol": "BTC-USD",
  "odds_up": "number 0-1 (share of Kronos paths finishing higher)",
  "reasons": [
   "plain-English strings"
  ],
  "_example": "EXAMPLE output for illustration only (captured/synthetic values); not live or current data. Not financial advice.",
  "agreement": "ALIGNED | OPPOSED | MIXED",
  "sentiment": null,
  "invalidation_level": "number"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quantx402-multi-asset-market-signal-api-ce0b03df/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)