# Vextorium Polymarket Market Detail

> Vextorium Polymarket Market Detail is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-29).

Returns detailed market data for a single Polymarket prediction market by slug, including question, resolution rules, outcome probabilities, best bid/ask, last price, volume, liquidity, and dates.

## Facts

- Endpoint: POST https://api.vextorium.com/polymarket-mercado-pago?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-polymarket-market-detail-32918892
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5Y_3fdgbii9xaFxrf7dp2

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-detail-32918892 -d '<json body>'
```

Example prompt: Pull the full Polymarket market details for the slug 'will-oprah-winfrey-win-the-2028-democratic-presidential-nomination' — I need the current outcome probabilities, best bid/ask, total volume, and resolution rules.

## When to prefer this

Choose this endpoint when you need comprehensive single-market data from Polymarket including both order book (bid/ask) and aggregate stats (volume, liquidity, probabilities) in one call. Prefer this over generic DeFi endpoints when the use case is prediction market research, event probability monitoring, or trading intelligence on Polymarket specifically. Ideal when you have a known market slug and need structured, parsed data without scraping Polymarket directly.

## Known failure modes

- Invalid or unknown slug returns null or empty response
- Market not found if slug is misspelled or outdated
- mejor_compra (best bid) may be null if no bids exist
- fuente_resolucion (resolution source) may be null for some markets
- cambio_24h (24h change) may be null for low-activity markets
- Network timeout if Polymarket API is slow or unavailable

## How this service works

Detail of one Polymarket market by slug or id: question, resolution rules and source, outcome probabilities, best bid/ask, last price, volume, liquidity and dates.

## Output

A JSON object containing: market id and slug, question text, description/resolution rules, resolution source, open status, start and close dates, outcome array with option names and probability percentages, best ask (mejor_venta) and best bid (mejor_compra) prices, last price, 24h price change, 24h USD volume, total USD volume, liquidity in USD, CLOB token ids, and a link to the Polymarket page.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "559687",
  "slug": "will-oprah-winfrey-win-the-2028-democratic-presidential-nomination",
  "cierre": "2028-11-08T04:59:00Z",
  "enlace": "https://polymarket.com/market/will-oprah-winfrey-win-the-2028-democratic-presidential-nomination",
  "inicio": "2025-07-11T18:36:32.333Z",
  "abierto": true,
  "pregunta": "Will Oprah Winfrey win the 2028 Democratic presidential nomination?",
  "cambio_24h": null,
  "resultados": [
   {
    "opcion": "Yes",
    "probabilidad_pct": 0.05
   },
   {
    "opcion": "No",
    "probabilidad_pct": 99.95
   }
  ],
  "descripcion": "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…",
  "mejor_venta": 0.001,
  "tokens_clob": [
   "2213957649161627793381994368131485505647723208738124952452819345058597751695",
   "44046525152074436753629616217525652949736205933417533647338274649282385796755"
  ],
  "liquidez_usd": 2887065,
  "mejor_compra": null,
  "ultimo_precio": 0.001,
  "volumen_24h_usd": 1050,
  "fuente_resolucion": null,
  "volumen_total_usd": 54432527
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-polymarket-market-detail-32918892/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)