# Quotient Sources API – News & X/Twitter Evidence for Prediction Markets

> Quotient Sources API – News & X/Twitter Evidence for Prediction Markets is a paid API for AI agents from quotient-api-gateway.onrender.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Returns the news articles and X/Twitter posts driving Quotient's prediction-market forecasts, with relevance scores, reasoning, evidence quotes, source tier, and author for up to ten markets.

## Facts

- Endpoint: GET https://quotient-api-gateway.onrender.com/api/v1/sources
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quotient-sources-api-news-x-twitter-evidence-for-prediction-markets-46c8807b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VeUV7kNPITJoOp8k04Khd

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 quotient-sources-api-news-x-twitter-evidence-for-prediction-markets-46c8807b
```

Example prompt: Pull the news articles and X/Twitter posts driving odds on these three Polymarket markets over the last 48 hours — I want to see relevance scores, the key evidence quotes, and what tier of source each piece comes from.

## When to prefer this

Use this endpoint when you need to understand the evidence and information flow behind a specific prediction market's probability — for auditing forecasts, building evidence-backed news feeds, or investigating what news or social media is actually moving odds. Prefer this over the general markets endpoint when your goal is source-level transparency rather than just the probability or signal itself.

## Known failure modes

- Invalid or unrecognized market_keys returns empty or partial results
- Unsupported venue enum value returns a validation error
- Window value outside 1–168 hours returns a schema validation error
- Markets with no recent coverage return an empty sources array
- Render cold-start latency may cause occasional slow first response
- Exceeding ten markets in one call may return truncated or error response

## How this service works

The news and X/Twitter evidence behind Quotient forecasts on Polymarket International, Polymarket US, Kalshi, and Limitless: recent articles and relevant posts for up to ten markets, with reasoning, evidence quotes, source tiers, authors, and canonical routing. Prefer market_keys for cross-venue or nullable-slug rows. Use this to audit a forecast or see what is moving event and asset-linked markets.

## Output

A list of up to ten markets, each with a time-ordered feed of news articles and X/Twitter posts. Each item includes: relevance score (0–1), reasoning explaining why the item is relevant, a direct evidence quote, source tier (e.g. tier-1 outlet, financial media, social), and author. Results are ordered by publication date and filtered to the requested time window.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "queryParams"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "types": {
       "type": "string"
      },
      "venue": {
       "enum": [
        "polymarket",
        "polymarket_us",
        "kalshi",
        "limitless"
       ],
       "type": "string",
       "description": "Prediction-market venue key: polymarket (Polymarket International), polymarket_us (Polymarket US), kalshi, or limitless."
      },
      "window": {
       "type": "integer",
       "default": 48,
       "maximum": 168,
       "minimum": 1
      },
      "markets": {
       "type": "string"
      },
      "market_keys": {
       "type": "string"
      }
     },
     "additionalProperties": false
    }
   },
   "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/quotient-sources-api-news-x-twitter-evidence-for-prediction-markets-46c8807b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quotient-api-gateway.onrender.com](https://www.zero.xyz/host/quotient-api-gateway.onrender.com/llms.txt)