# Vextorium Polymarket Markets

> Vextorium Polymarket Markets is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-28).

Fetches live Polymarket prediction market data including questions, probabilities, liquidity, and volume, with optional search and sorting.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/polymarket-markets?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-polymarket-markets-c5a34314
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dwi-18zKLyNqyEx6FQRw8

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 vextorium-polymarket-markets-c5a34314 -d '<json body>'
```

Example prompt: Pull me the top 10 Polymarket markets sorted by volume and show me the current implied probabilities for each outcome.

## When to prefer this

Use this endpoint when you need real-time Polymarket prediction market data — questions, crowd-implied probabilities, volume, and liquidity — for sports, politics, crypto, or any other event. Prefer this over general web search when you need structured, machine-readable probability data directly from Polymarket's markets rather than news articles or commentary about them.

## Known failure modes

- Invalid sort order enum value returns validation error
- Limit set too high may return empty or truncated results
- Search query with no matches returns empty markets array
- Polymarket API downtime causes upstream data unavailability
- Malformed request body results in HTTP 400

## How this service works

558 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, Hyperliquid, economy and official statistics, FX, validation, web and developer tools. Pay in USDC via x402.

## Output

Returns a list of Polymarket prediction markets, each containing the market question, a direct link to the market, outcome options with implied probability percentages, 24-hour and total trading volume in USD, liquidity in USD, 24-hour probability change, and the market close timestamp. Also echoes back the sort order and any search query used.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "integer"
  },
  "order": {
   "enum": [
    "volume",
    "liquidity",
    "close"
   ],
   "type": "string"
  },
  "search": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "Probabilities implied by the market price; they are not guaranteed predictions. Source: Polymarket.",
  "order": "volume",
  "search": null,
  "markets": [
   {
    "id": "4720686",
    "link": "https://polymarket.com/market/unl-bel-tur-2026-10-02-bel",
    "slug": "unl-bel-tur-2026-10-02-bel",
    "close": "2026-10-02T18:45:00Z",
    "results": [
     {
      "option": "Yes",
      "probability_pct": 95.5
     },
     {
      "option": "No",
      "probability_pct": 4.5
     }
    ],
    "question": "Will Belgium win on 2026-10-02?",
    "change_24h": 0.32,
    "liquidity_usd": 60172,
    "volume_24h_usd": 2587928,
    "total_volume_usd": 2641418
   },
   {
    "id": "5180164",
    "link": "https://polymarket.com/market/dota2-og-bb4-2026-10-02",
    "slug": "dota2-og-bb4-2026-10-02",
    "close": "2026-10-02T22:45:00Z",
    "results": [
     {
      "option": "OG",
      "probability_pct": 91
     },
     {
      "option": "BetBoom Team",
      "probability_pct": 9
     }
    ],
    "question": "Dota 2: OG vs BetBoom Team (BO3) - BLAST Slam Group C",
    "change_24h": 0.56,
    "liquidity_usd": 55273,
    "volume_24h_usd": 1136462,
    "total_volume_usd": 1125844
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-polymarket-markets-c5a34314/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)