# Genexxis Odds - Top Prediction Markets by Volume

> Genexxis Odds - Top Prediction Markets by Volume is a paid API for AI agents from odds.genexxis.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Returns the most actively traded open prediction markets across Polymarket and Kalshi, ranked by 24-hour volume, with implied probabilities and market links.

## Facts

- Endpoint: GET https://odds.genexxis.com/top?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/genexxis-odds-top-prediction-markets-by-volume-db4883b0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lXIPcT9Y2ORRbW6NczDce

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 genexxis-odds-top-prediction-markets-by-volume-db4883b0
```

Example prompt: What are the top 20 most traded prediction markets on Polymarket and Kalshi right now, ranked by 24-hour volume, with their implied probabilities?

## When to prefer this

Use this endpoint when you need a ranked leaderboard of the most actively traded prediction markets across both Polymarket and Kalshi simultaneously, ordered by 24h volume. Prefer this over search-based endpoints when you want trending/popular markets rather than topic-specific ones, and over single-market detail endpoints when you need a broad market overview.

## Known failure modes

- Invalid limit parameter (outside 1-50 range) may return an error or default
- Payment failure (x402 micropayment not completed) returns 402 status
- Markets data may be slightly delayed relative to live exchange feeds
- If no markets are currently active, count may return 0 with empty markets array

## How this service works

Most traded open prediction markets right now across Polymarket and Kalshi, ranked by 24h volume, with implied probabilities and links.

## Output

A JSON array of up to 50 prediction markets sorted by 24-hour trading volume, each containing: market ID, question text, venue (polymarket or kalshi), end date, 24h USD volume, outcome names with implied probabilities (0-1), and a direct URL to the market.

## 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",
     "properties": {
      "limit": {
       "type": "string",
       "description": "Number of markets (1-50, default 10)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 1,
  "errors": [],
  "markets": [
   {
    "id": "6102519",
    "url": "https://polymarket.com/event/lol-g2-los-2026-10-24",
    "venue": "polymarket",
    "endDate": "2026-10-25T01:00:00Z",
    "outcomes": [
     {
      "name": "G2 Esports",
      "probability": 0.9995
     },
     {
      "name": "LOS",
      "probability": 0.0005
     }
    ],
    "question": "LoL: G2 Esports vs LOS (BO1) - Worlds Group Stage",
    "volume24hUsd": 4822370
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/genexxis-odds-top-prediction-markets-by-volume-db4883b0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from odds.genexxis.com](https://www.zero.xyz/host/odds.genexxis.com/llms.txt)