# SiteCheck Polymarket Event Lookup

> SiteCheck Polymarket Event Lookup is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).

Fetches detailed Polymarket prediction market event data including markets, outcomes, prices, and liquidity by event slug or ID

## Facts

- Endpoint: GET https://api.sitecheck-api.workers.dev/api/pm/event?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-polymarket-event-lookup-1ca1a4a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2Fi38jV5J2wTO14WuMnFU

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 sitecheck-polymarket-event-lookup-1ca1a4a0
```

Example prompt: Pull up the Polymarket event for 'will-aoc-announce-a-run-for-senate-or-president-before-2028' and show me the current outcome prices and liquidity for each market.

## When to prefer this

Use this endpoint when you need structured Polymarket event data including all sub-markets, outcome prices, liquidity, and resolution rules for a known event slug or ID. Prefer this over scraping polymarket.com directly when you need machine-readable JSON with token IDs and condition IDs for downstream trading or analysis workflows.

## Known failure modes

- Missing or invalid slug returns an error — slug is required
- Non-existent slug returns no data or 404-equivalent
- Truncated or malformed response if the event has an unusually large number of markets
- Stale data if Polymarket Gamma API is delayed or unavailable
- Payment failure if USDC balance is insufficient for the $0.003 per-call fee

## How this service works

Fetches details for a single Polymarket event by slug or numeric ID, including all associated markets, outcome tokens, implied probability prices, volume, liquidity, resolution source, rules, and start/end dates. Information only, not financial advice.

## Output

Returns a JSON object with the event's title, URL, slug, active/closed status, total volume, end date, and an array of markets. Each market includes its question, resolution rules, outcome prices (Yes/No probabilities between 0 and 1), liquidity, condition ID, and token IDs for trading on Polymarket.

## 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",
     "required": [
      "slug"
     ],
     "properties": {
      "id": {
       "type": "string",
       "description": "Event numeric or unique ID"
      },
      "slug": {
       "type": "string",
       "description": "Event slug identifier on Polymarket"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "872248",
  "url": "https://polymarket.com/event/will-aoc-announce-a-run-for-senate-or-president-before-2028",
  "slug": "will-aoc-announce-a-run-for-senate-or-president-before-2028",
  "title": "Will AOC announce a run for Senate or President before 2028?",
  "active": true,
  "closed": false,
  "source": "Polymarket Gamma API (gamma-api.polymarket.com/events)",
  "volume": 39935.233645,
  "endDate": "2028-01-01T04:59:00.000Z",
  "markets": [
   {
    "id": "3708349",
    "slug": "untitled-market-1",
    "rules": "This market will resolve based on the office, between United States Senator and President of the United States, that Rep. Alexandria Ocasio-Cortez first officially announces that she is running for in the 2028 election cycle by December 31, 2027, 11:59 PM ET. \n\nAn announcement by the listed individual will be sufficient to resolve this market in favor of the corresponding outcome, regardless of whether they actually filed a nomination to run, or whether they actually file a nomination to run in the future.\n\nA qualifying announcement must be explicit and unambiguous. Conditional statements, or …",
    "active": true,
    "closed": false,
    "volume": 12922.606203,
    "endDate": "2027-12-31T23:59:00.000Z",
    "outcomes": [
     {
      "price": 0.345,
      "outcome": "Yes",
      "tokenId": "15955335254587623951996931492421635331132397655069036024714198819424672744760"
     },
     {
      "price": 0.655,
      "outcome": "No",
      "tokenId": "97388452191083083459057550028944811067953630328443141965271155682808926121396"
     }
    ],
    "question": "Will Alexandria Ocasio-Cortez run for Senate in 2028?",
    "liquidity": 24805.5128,
    "conditionId": "0xc45a45f69c812ce413bff2243fbf0bf6b2ac27d24556f3ad4fd61c6a26e68349",
    "resolutionSource": null
   },
   {
    "id": "3708350",
    "slug": "will-alexandria-ocasio-cortez-run-for-senate-in-2028",
    "rules": "This market will resolve based on the office, between United States Senator and President of the United States, that Rep. Alexandria Ocasio-Cortez first officially announces that she is running for in the 2028 election cycle by December 31, 2027, 11:59 PM ET. \n\nAn announcement by the listed individual will be sufficient to resolve this market in favor of the corresponding outcome, regardless of whether they actually filed a nomination to run, or whether they actually file a nomination to run in the future.\n\nA qualifying announcement mu
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-polymarket-event-lookup-1ca1a4a0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sitecheck-api.workers.dev](https://www.zero.xyz/host/api.sitecheck-api.workers.dev/llms.txt)