Polymarket Odds API

API ID 14856

Live Polymarket market prices as implied probability with volume, liquidity and close time, searchable by keyword, as JSON.

API Documentation

Endpoints

Request
Prediction Markets API - Kalshi & Polymarket Odds, MCP. Returns up to 100 results per request as JSON.
Endpoint ID: 38672
GET https://zylalabs.com/api/14856/polymarket+odds+api/38672/prediction+markets+api
INPUT PARAMETERS

Prediction Markets API — Endpoint Features

Object Description
query Optional Words to search for in market and event titles, for example bitcoin, election, fed rates. Leave empty to get the top markets by volume.
venues Optional Which prediction markets to read. Both are official public APIs without login. Several values: comma separated.
status Optional Open = markets that can still be traded, closed = finished or settled markets, all = both.
category Optional Optional. Keep only markets whose category or tag contains this text, for example Politics, Crypto, Economics, Sports. Leave empty for all categories.
minVolume Optional Skip markets with a total traded volume below this value in USD. 0 keeps everything.
maxResults Optional Maximum number of market rows to output in total, highest volume first. Maximum 2000.
matchAcrossVenues Optional When both venues are selected, pair Kalshi and Polymarket markets that ask the same question (by title similarity) and add the other venue's price plus priceGapPts, the YES probability difference in percentage points.
minPriceMovePts Optional Only-new mode: a known market is output again only if its YES probability changed by at least this many percentage points since the last run with the same Monitor ID.

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

query
venues
status
category
minVolume
maxResults
matchAcrossVenues
minPriceMovePts
API EXAMPLE RESPONSE
JSON
{
    "count": 5,
    "items": [
        {
            "venue": "polymarket",
            "marketId": "665374",
            "eventId": "73130",
            "eventTitle": "Will the U.S. invade Iran before 2027?",
            "question": "Will the U.S. invade Iran before 2027?",
            "outcomes": [
                "Yes",
                "No"
            ],
            "yesPrice": 0.075,
            "noPrice": 0.925,
            "volume": 79865019.0853,
            "volume24h": 235945.3295,
            "liquidity": 318190.7688,
            "openInterest": null,
            "closeTime": "2027-01-01T04:59:00Z",
            "status": "open",
            "category": "Military Strikes",
            "url": "https://polymarket.com/event/will-the-us-invade-iran-before-2027",
            "impliedProbabilityPct": 7.5,
            "fetchedAt": "2026-11-12T06:22:37Z"
        },
        {
            "venue": "polymarket",
            "marketId": "561251",
            "eventId": "31552",
            "eventTitle": "Presidential Election Winner 2028",
            "question": "Will LeBron James win the 2028 US Presidential Election?",
            "outcomes": [
                "Yes",
                "No"
            ],
            "yesPrice": 0.0005,
            "noPrice": 0.9995,
            "volume": 55187134.9687,
            "volume24h": 366.44,
            "liquidity": 2177922.8367,
            "openInterest": null,
            "closeTime": "2028-11-08T04:59:00Z",
            "status": "open",
            "category": "President",
            "url": "https://polymarket.com/event/presidential-election-winner-2028",
            "impliedProbabilityPct": 0.05,
            "fetchedAt": "2026-11-12T06:22:37Z"
        },
        {
            "venue": "polymarket",
            "marketId": "559687",
            "eventId": "30829",
            "eventTitle": "Democratic Presidential Nominee 2028",
            "question": "Will Oprah Winfrey win the 2028 Democratic presidential nomination?",
            "outcomes": [
                "Yes",
                "No"
            ],
            "yesPrice": 0.0005,
            "noPrice": 0.9995,
            "volume": 54667909.1858,
            "volume24h": 312,
            "liquidity": 2736274.107,
            "openInterest": null,
            "closeTime": "2028-11-08T04:59:00Z",
            "status": "open",
            "category": "United States",
            "url": "https://polymarket.com/event/democratic-presidential-nominee-2028",
            "impliedProbabilityPct": 0.05,
            "fetchedAt": "2026-11-12T06:22:37Z"
        },
        {
            "venue": "polymarket",
            "marketId": "559679",
            "eventId": "30829",
            "eventTitle": "Democratic Presidential Nominee 2028",
            "question": "Will Bernie Sanders win the 2028 Democratic presidential nomination?",
            "outcomes": [
                "Yes",
                "No"
            ],
            "yesPrice": 0.0025,
            "noPrice": 0.9975,
            "volume": 52983452.2956,
            "volume24h": 4410.063,
            "liquidity": 224784.2866,
            "openInterest": null,
            "closeTime": "2028-11-08T04:59:00Z",
            "status": "open",
            "category": "United States",
            "url": "https://polymarket.com/event/democratic-presidential-nominee-2028",
            "matchedVenue": "kalshi",
            "matchedMarketId": "KXPRESNOMD-28-BS",
            "matchedQuestion": "Will Bernie Sanders be the Democratic Presidential nominee in 2028?",
            "matchedYesPrice": 0.005,
            "matchedUrl": "https://kalshi.com/markets/kxpresnomd-28",
            "matchScore": 0.857,
            "priceGapPts": 0.25,
            "impliedProbabilityPct": 0.25,
            "fetchedAt": "2026-11-12T06:22:37Z"
        },
        {
            "venue": "polymarket",
            "marketId": "559684",
            "eventId": "30829",
            "eventTitle": "Democratic Presidential Nominee 2028",
            "question": "Will Chelsea Clinton win the 2028 Democratic presidential nomination?",
            "outcomes": [
                "Yes",
                "No"
            ],
            "yesPrice": 0.0075,
            "noPrice": 0.9925,
            "volume": 51133396.1102,
            "volume24h": 257.4,
            "liquidity": 177824.5623,
            "openInterest": null,
            "closeTime": "2028-11-08T04:59:00Z",
            "status": "open",
            "category": "United States",
            "url": "https://polymarket.com/event/democratic-presidential-nominee-2028",
            "impliedProbabilityPct": 0.75,
            "fetchedAt": "2026-11-12T06:22:37Z"
        }
    ]
}
Prediction Markets API — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14856/polymarket+odds+api/38672/prediction+markets+api?venues=polymarket,kalshi&status=open&minVolume=OptionalmaxResults=5&matchAcrossVenues=true&minPriceMovePts=5' --header 'Authorization: Bearer YOUR_API_KEY' 


    

API Access Key & Authentication

After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Polymarket Odds API simply include your bearer token in the Authorization header.

Headers
Header Description
Authorization Required Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.

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Overview

Live Polymarket market prices as implied probability with volume, liquidity and close time, searchable by keyword, as JSON.

Polymarket Odds API FAQs

Read prediction-market odds from the official public APIs of Polymarket and Kalshi in one flat schema. One row per market: question, YES/NO price, implied probability, volume, 24h volume, liquidity, open interest (Kalshi), close time, status.

Up to 100 results per request. Set it with the maxResults parameter.

Every request collects live data from the public source. Identical requests may be served from a cache for up to 6 hours.

List parameters accept several values separated by commas, for example: london,paris.

The endpoint accepts these query parameters, all optional: query, venues, status, category, minVolume, maxResults, matchAcrossVenues, minPriceMovePts. Query: Words to search for in market and event titles, for example bitcoin, election, fed rates. Leave empty to get the top markets by volume. Venues: Which prediction markets to read. Both are official public APIs without login. Several values: comma separated. Status: Open = markets that can still be traded, closed = finished or settled markets, all = both. Category: Optional. Keep only markets whose category or tag contains this text, for example Politics, Crypto, Economics, Sports. Leave empty for all categories.

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