# Vextorium Polymarket Events

> Vextorium Polymarket Events is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-11).

Fetches current Polymarket prediction market events with market options, probabilities, and trading volumes

## Facts

- Endpoint: POST https://api.vextorium.com/v1/polymarket-events?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-polymarket-events-42b7d1a9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_r5K16TRnXQZdhHJB0TtsO

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-events-42b7d1a9 -d '<json body>'
```

Example prompt: What does Polymarket currently predict for the Fed's interest rate decision in October? Show me the top 5 events and their yes/no probabilities.

## When to prefer this

Use this endpoint when you need live Polymarket prediction market data — event probabilities, trading volumes, and market options — especially for political, economic, or crypto events. Prefer this over scraping Polymarket directly, or when you need structured JSON output suitable for downstream agent reasoning about crowd-sourced event probabilities.

## Known failure modes

- No events found for a very narrow or obscure search term
- Search query returns unrelated events due to loose text matching
- Stale probability data if Polymarket feed is delayed
- Rate limit or payment failure (USDC x402 payment rejected)
- Empty result set if search parameter matches nothing

## How this service works

Polymarket events with all their markets: elections, Fed decisions, sports, crypto... Each event with the probability of every option (candidate, rate range, team), volume and close date; top by volume or matching a search.

## Output

Returns a list of Polymarket prediction market events, each with the event name, URL slug, closing date, link to Polymarket, and an array of individual market options showing the option label, slug, USD trading volume, and implied probability (as a yes percentage). Also includes total volume, 24-hour volume, number of markets per event, and a disclaimer that probabilities are market-implied, not guaranteed predictions.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [],
     "properties": {
      "limit": {
       "type": "integer"
      },
      "search": {
       "type": "string"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": [
      "object",
      "null"
     ],
     "properties": {
      "note": {
       "type": [
        "string",
        "null"
       ]
      },
      "events": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": [
         "null",
         "object"
        ],
        "properties": {
         "link": {
          "type": [
           "null",
           "string"
          ]
         },
         "slug": {
          "type": [
           "null",
           "string"
          ]
         },
         "close": {
          "type": [
           "null",
           "string"
          ]
         },
         "event": {
          "type": [
           "null",
           "string"
          ]
         },
         "markets": {
          "type": [
           "array",
           "null"
          ],
          "items": {
           "type": [
            "null",
            "object"
           ],
           "properties": {
            "slug": {
             "type": [
              "null",
              "string"
             ]
            },
            "option": {
             "type": [
              "null",
              "string"
             ]
            },
            "volume_usd": {
             "type": [
              "null",
              "number"
             ]
            },
            "probability_yes_pct": {
             "type": [
              "null",
              "number"
             ]
            }
           }
          }
         },
         "num_markets": {
          "type": [
           "null",
           "number"
          ]
         },
     
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "Probabilities implied by the market price; they are not guaranteed predictions.",
  "events": [
   {
    "link": "https://polymarket.com/event/brazil-presidential-election",
    "slug": "brazil-presidential-election",
    "close": "2026-10-05T03:59:00Z",
    "event": "Brazil Presidential Election",
    "markets": [
     {
      "slug": "will-flvio-bolsonaro-win-the-2026-brazilian-presidential-election",
      "option": "Flávio Bolsonaro",
      "volume_usd": 13676392,
      "probability_yes_pct": 56.95
     },
     {
      "slug": "will-luiz-incio-lula-da-silva-win-the-2026-brazilian-presidential-election",
      "option": "Luiz Inácio Lula da Silva",
      "volume_usd": 14053722,
      "probability_yes_pct": 43.5
     }
    ],
    "num_markets": 32,
    "volume_24h_usd": 2719744,
    "total_volume_usd": 162530742
   },
   {
    "link": "https://polymarket.com/event/fed-decision-in-october-20260617190323537",
    "slug": "fed-decision-in-october-20260617190323537",
    "close": "2026-10-29T03:59:00Z",
    "event": "Fed Decision in October?",
    "markets": [
     {
      "slug": "will-there-be-no-change-in-fed-interest-rates-after-the-october-2026-meeting-20260617190324031",
      "option": "No change",
      "volume_usd": 7162734,
      "probability_yes_pct": 82.5
     },
     {
      "slug": "will-the-fed-increase-interest-rates-by-25-bps-after-the-october-2026-meeting-20260617190324032",
      "option": "25 bps increase",
      "volume_usd": 6115654,
      "probability_yes_pct": 17.5
     }
    ],
    "num_markets": 5,
    "volume_24h_usd": 2232441,
    "total_volume_usd": 24244124
   }
  ],
  "search": null,
  "source": "Polymarket"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-polymarket-events-42b7d1a9/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)