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SiteCheck Prediction Market Search
x402
SiteCheck Prediction Market Search 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 2026-10-16).
Search and filter prediction markets across Polymarket and Manifold by keyword, date range, volume, and venue
Price / call$0.003
Success—
StatusUnknown
How this service works
Searches open prediction markets on Polymarket (real money, USDC) and Manifold (play money) by keywords, with optional closing-date window and minimum volume. Each row: venue, question, outcomes with prices (implied probability), volume with its unit (USD or mana), liquidity, close time and link. Results alternate between venues; up to 50 rows. Information only, not financial advice.
Output
Returns a JSON object with a list of matching prediction markets, each including the market question, URL, venue (polymarket or manifold), current outcome prices, volume, liquidity, volume unit, and closing time. Also includes metadata about which venues were queried, which were unavailable, and a disclaimer that results are informational only.
Example use cases
Fed rate decision probability check
“Search prediction markets for 'fed rate cut' on Polymarket, only show me markets closing after 2026-06-01, and return the top 5 by volume so I can see what traders think will happen.”
Election outcome market discovery
“Find me prediction markets about the 2026 US midterm elections across all venues — I want to see the outcome prices and how much liquidity each market has.”
Bitcoin price prediction lookup
“Search for any bitcoin price prediction markets on Polymarket with at least $50,000 in volume, closing before 2026-12-31 — I want to see the current Yes/No odds.”
Technical details
Endpoint
GEThttps://api.sitecheck-api.workers.dev/api/pm/search?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to search for prediction market odds and questions across Polymarket and Manifold simultaneously. It is the right choice when an agent needs to gauge market sentiment or probability on political, economic, or crypto events, especially when you want to filter by volume, date range, or a specific venue. Prefer this over manually querying Polymarket or Manifold directly, since it aggregates both in one call.
Side effects
- No markets match the query — returns empty markets array with count 0
- Venue unavailable — specific venue listed in venuesUnavailable field
- Invalid date format for closeAfter/closeBefore — likely returns error or ignores parameter
- Limit out of range (not 1-50) — may default to 20 or return error
- Network timeout from upstream Polymarket or Manifold APIs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 10,
"query": "fed",
"source": "Polymarket Gamma public-search (gamma-api.polymarket.com), Manifold API (api.manifold.markets)",
"markets": [
{
"id": "2589810",
"url": "https://polymarket.com/event/fed-decision-in-october-20260617190323537",
"slug": "will-the-fed-decrease-interest-rates-by-50-bps-after-the-october-2026-meeting-20260617190324029",
"venue": "polymarket",
"volume": 6627619,
"outcomes": [
{
"price": 0.002,
"outcome": "Yes"
},
{
"price": 0.999,
"outcome": "No"
}
],
"question": "Will the Fed decrease interest rates by 50+ bps after the October 2026 meeting?",
"closeTime": "2026-10-29T03:59:00.000Z",
"eventSlug": "fed-decision-in-october-20260617190323537",
"liquidity": 1520688,
"volumeUnit": "USD"
},
{
"id": "hII6EUzNlU",
"url": "https://manifold.markets/BillClintonBubba/fed-decision-in-october",
"slug": "fed-decision-in-october",
"venue": "manifold",
"volume": 51101,
"outcomes": [],
"question": "Fed decision in October?",
"closeTime": "2026-10-28T18:00:00.000Z",
"eventSlug": null,
"liquidity": 1000,
"volumeUnit": "mana (play money)"
},
{
"id": "2589811",
"url": "https://polymarket.com/event/fed-decision-in-october-20260617190323537",
"slug": "will-the-fed-decrease-interest-rates-by-25-bps-after-the-october-2026-meeting-20260617190324030",
"venue": "polymarket",
"volume": 7141895,
"outcomes": [
{
"price": 0.004,
"outcome": "Yes"
},
{
"price": 0.997,
"outcome": "No"
}
],
"question": "Will the Fed decrease interest rates by 25 bps after the October 2026 meeting?",
"closeTime": "2026-10-29T03:59:00.000Z",
"eventSlug": "fed-decision-in-october-20260617190323537",
"liquidity": 848830,
"volumeUnit": "USD"
}
],
"checkedAt": "2026-10-15T18:21:04.920Z",
"disclaimer": "Information only, not financial advice.",
"venuesChecked": [
"manifold",
"polymarket"
],
"venuesUnavailable": []
}
}Tags
x402
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