# QuantX402 Sentiment

> QuantX402 Sentiment is a paid API for AI agents from quantx402.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Returns a composite market-mood score for a single crypto or stock symbol, blending model lean, price momentum, and news tone into one sentiment read.

## Facts

- Endpoint: GET https://quantx402.app/api/v1/sentiment?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantx402-sentiment-077c4660
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8ec8LZZTt6khLmsA-gK1d

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-sentiment-077c4660
```

Example prompt: What's the composite market sentiment for BTC-USD right now — including the model lean, price momentum, and news tone breakdown?

## When to prefer this

Choose this endpoint when you need a single, consolidated sentiment signal that blends multiple signals (model direction, price momentum, news tone) for a supported crypto pair or US stock/ETF, rather than building your own composite from raw data. Prefer it over raw news or pure price feeds when you want an opinionated, pre-aggregated market mood score with component-level transparency. Best for agents making quick sentiment-informed decisions without needing full forecast candles.

## Known failure modes

- Symbol not in supported list — returns error or empty result
- News component absent if no recent headlines exist in the pipeline for that symbol
- Stale or delayed data if upstream market feed is lagging
- Payment failure if USDC balance is insufficient for the $0.01 per-call fee
- Invalid symbol format returns a validation error

## How this service works

Sentiment: a composite market-mood read for one symbol from our own pipeline: model lean, price momentum, and news tone (when our news feed has items). Each component is shown with its inputs. Experimental. Not financial advice.

## Output

A composite sentiment object for the requested symbol containing: an overall market-mood score, a model lean component (directional signal from the Kronos model), a price momentum component (recent price trend input), and a news tone component (sentiment from the news pipeline when headlines are available), each with their contributing inputs. Marked as experimental; not financial advice.

## 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": {
      "symbol": {
       "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) or stock/ETF (SPY, QQQ, AAPL, NVDA, TSLA, MSFT, AMZN, META, GOOGL, IWM, DIA)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quantx402-sentiment-077c4660/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)