# Vextorium Polymarket Market Lookup

> Vextorium Polymarket Market Lookup is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-18).

Fetches detailed data for a specific Polymarket prediction market by slug, including current prices, probabilities, volume, and liquidity.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/polymarket-market?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-polymarket-market-lookup-fe636a00
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qUU3CAFAqDHgE69rbjKhE

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-market-lookup-fe636a00 -d '<json body>'
```

Example prompt: What are the current odds and trading volume for the Polymarket market 'will-oprah-winfrey-win-the-2028-democratic-presidential-nomination'? I want to see probabilities, liquidity, and whether it's still open.

## When to prefer this

Use this endpoint when you need structured, machine-readable data for a specific Polymarket prediction market identified by its slug — including current prices, probabilities, volume, and liquidity. Prefer this over scraping the Polymarket website directly. Best for agents that need to monitor, analyze, or report on prediction market outcomes for specific events.

## Known failure modes

- Invalid or non-existent slug returns an error or empty result
- Market may be closed or resolved, returning open: false
- best_buy and change_24h fields may be null for illiquid or inactive markets
- resolution_source may be null if not yet specified by market creator
- Network timeout or upstream Polymarket API unavailability

## 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 JSON object with the market's unique ID, question text, full description, open/close status, start and close timestamps, outcome probabilities (Yes/No with percentage), last traded price, best sell price, 24h price change, 24h USD volume, total USD volume, liquidity in USD, a link to the Polymarket page, CLOB token IDs, and resolution source.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "slug": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "559687",
  "link": "https://polymarket.com/market/will-oprah-winfrey-win-the-2028-democratic-presidential-nomination",
  "open": true,
  "slug": "will-oprah-winfrey-win-the-2028-democratic-presidential-nomination",
  "close": "2028-11-08T04:59:00Z",
  "start": "2025-07-11T18:36:32.333Z",
  "results": [
   {
    "option": "Yes",
    "probability_pct": 0.05
   },
   {
    "option": "No",
    "probability_pct": 99.95
   }
  ],
  "best_buy": null,
  "question": "Will Oprah Winfrey win the 2028 Democratic presidential nomination?",
  "best_sell": 0.001,
  "change_24h": null,
  "last_price": 0.001,
  "description": "This market will resolve to “Yes” if the named individual wins and accepts the 2028 nomination of the Democratic Party for U.S. president. Otherwise, this market will resolve to “No”.\n\nThe resolution source for this market will be a consensus of official Democratic Party sources.\n\nAny replacement of…",
  "tokens_clob": [
   "2213957649161627793381994368131485505647723208738124952452819345058597751695",
   "44046525152074436753629616217525652949736205933417533647338274649282385796755"
  ],
  "liquidity_usd": 2887065,
  "volume_24h_usd": 1050,
  "total_volume_usd": 54432527,
  "resolution_source": null
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-polymarket-market-lookup-fe636a00/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)