{
"data": {
"status": "ok",
"time": "2026-10-26T19:05:56.599Z",
"venues": [
"polymarket",
"kalshi",
"manifold"
]
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37137/health+check' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"venues": [
"polymarket",
"kalshi",
"manifold"
]
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37138/list+venues' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"count": 1,
"markets": [
{
"bestAsk": 0.921,
"bestBid": 0.92,
"category": "fomc",
"closeTime": "2026-10-29T03:59:00Z",
"id": "2589812",
"liquidity": 267606.65,
"outcomes": [
{
"ask": 0.921,
"bid": 0.92,
"name": "Yes",
"odds": {
"american": -1158,
"decimal": 1.086,
"probability": 0.9205
}
},
{
"ask": 0.08,
"bid": 0.079,
"name": "No",
"odds": {
"american": 1158,
"decimal": 12.579,
"probability": 0.0795
}
}
],
"status": "open",
"ticker": "will-there-be-no-change-in-fed-interest-rates-after-the-october-2026-meeting",
"title": "Will there be no change in Fed interest rates after the October 2026 meeting?",
"venue": "polymarket",
"volume": 23357574.46
}
],
"warnings": null
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37139/list+markets?venue=polymarket&q=bitcoin&limit=5' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"bestAsk": 0.11,
"bestBid": 0.09,
"id": "KXHIGHNY-26OCT27-T67",
"outcomes": [
{
"name": "Yes",
"odds": {
"american": 900,
"decimal": 10,
"probability": 0.1
}
},
{
"name": "No",
"odds": {
"american": -900,
"decimal": 1.111,
"probability": 0.9
}
}
],
"status": "open",
"title": "Highest temperature in NYC above 67 on Oct 27",
"venue": "kalshi",
"volume": 295
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37140/get+market&venue=Required&/=Required&id=Required' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"asks": [
{
"price": 0.11,
"size": 73.59
},
{
"price": 0.12,
"size": 28.6
}
],
"bids": [
{
"price": 0.08,
"size": 1540.73
},
{
"price": 0.07,
"size": 2236.48
}
],
"ticker": "KXELONMARS-99",
"venue": "kalshi"
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37141/get+order+book&venue=Required&/=Required&id=Required' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"outcomes": [
{
"name": "Yes",
"odds": {
"american": 733,
"decimal": 8.333,
"probability": 0.12
}
},
{
"name": "No",
"odds": {
"american": -733,
"decimal": 1.136,
"probability": 0.88
}
}
],
"title": "Will Kylian Mbappe win the 2026 Ballon d Or?",
"venue": "polymarket"
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37142/get+market+odds&venue=Required&/=Required&id=Required' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"query": "fed rate",
"results": [
{
"probability": 0.92,
"title": "Fed decision in October?",
"venue": "polymarket"
},
{
"probability": 0.9,
"title": "Fed holds rates in October",
"venue": "kalshi"
}
]
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37143/compare+odds+by+topic?q=fed rate' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"candles": [
{
"c": 0.09,
"h": 0.11,
"l": 0.09,
"o": 0.11,
"t": 1790467200000,
"time": "2026-09-27T00:00:00.000Z",
"v": 295
}
],
"interval": "1d",
"lookback": "30d",
"outcome": "Yes",
"ticker": "KXHIGHNY-26OCT27-T67",
"venue": "kalshi"
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37144/get+price+history?interval=1d&lookback=30d&outcome=Yes&venue=Required&/=Required&id=Required' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"count": 1,
"markets": [
{
"id": "abc123",
"outcomes": [
{
"name": "Yes",
"odds": {
"american": 614,
"decimal": 7.143,
"probability": 0.14
}
}
],
"title": "Will Brazil win the 2026 World Cup?",
"venue": "manifold"
}
],
"warnings": null
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37145/search+markets?q=world cup&venue=manifold&limit=5' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"count": 1,
"minEdge": 0.02,
"opportunities": [
{
"buy": [
{
"price": 0.115,
"side": "Yes",
"venue": "polymarket"
},
{
"price": 0.84,
"side": "No",
"venue": "kalshi"
}
],
"cost": 0.955,
"edge": 0.045,
"edgePct": 4.5,
"markets": [
{
"title": "Will Naftali Bennett be the next Prime Minister of Israel?",
"venue": "polymarket"
},
{
"title": "Will Naftali Bennett be the next Prime Minister of Israel?",
"venue": "kalshi"
}
],
"similarity": 1
}
],
"scanned": {
"kalshi": 150,
"manifold": 75,
"polymarket": 100
}
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37146/cross+venue+arbitrage+scanner?q=bitcoin&minEdge=0.02&feeAware=true&limit=20' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"buyTheField": {
"edge": 0.005,
"edgePct": 0.5,
"profitable": true,
"totalCost": 0.995
},
"event": {
"id": "81557",
"mutuallyExclusive": true,
"title": "Prime Minister of Israel after the next election?"
},
"legs": [
{
"ask": 0.54,
"bid": 0.536,
"id": "682708",
"title": "Will Gadi Eizenkot be the next Prime Minister of Israel?"
}
],
"outcomeCount": 19,
"venue": "polymarket"
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37147/dutch+book+scanner+single+event?feeAware=false&venue=Required&/=Required&eventId=Required' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"count": 1,
"events": [
{
"buyTheField": {
"edge": 0.005,
"edgePct": 0.5,
"profitable": true
},
"event": {
"title": "Prime Minister of Israel after the next election?"
},
"outcomeCount": 19,
"venue": "polymarket"
}
]
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37148/dutch+book+scanner+search+events?q=prime minister of israel&minEdge=0.01&feeAware=true' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"agreement": {
"spreadPct": 4.2,
"stdDev": 0.021,
"venuesMatched": 3
},
"consensus": {
"american": 144,
"decimal": 2.439,
"probability": 0.41
},
"pivotVenue": "polymarket",
"query": "fed rate cut october",
"venues": [
{
"deviationFromConsensus": -0.01,
"probability": 0.4,
"venue": "polymarket",
"volume": 23000000
},
{
"deviationFromConsensus": 0.03,
"probability": 0.44,
"venue": "kalshi",
"volume": 58000
}
]
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37149/consensus+fair+value?q=fed rate cut october&minSimilarity=0.55' --header 'Authorization: Bearer YOUR_API_KEY'
{
"data": {
"appliedFraction": 0.1364,
"edge": 0.15,
"evPerDollarStaked": 0.3333,
"expectedProfit": 22.73,
"fullKellyFraction": 0.2727,
"hasEdge": true,
"inputs": {
"bankroll": 500,
"fraction": 0.5,
"price": 0.45,
"probability": 0.6
},
"recommendedStake": 68.18
},
"error": false,
"message": "OK"
}
curl --location --request GET 'https://zylalabs.com/api/14541/prediction+markets+api/37150/kelly+criterion+calculator?probability=0.6&price=0.45&bankroll=500&fraction=0.5' --header 'Authorization: Bearer YOUR_API_KEY'
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 Prediction Markets API simply include your bearer token in the Authorization header.
| Header | Description |
|---|---|
Authorization
|
Required
Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.
|
No long-term commitment. Upgrade, downgrade, or cancel anytime.
Live Polymarket, Kalshi and Manifold odds, price history, arbitrage scanner, consensus fair value and Kelly sizing in one JSON API.
No. It is an independent API that aggregates and normalizes public market data from the three venues into one format. It is not affiliated with or endorsed by any of them.
No. Your Zyla API key is all you need.
Yes. Every response is computed live at request time. A few seconds of client-side caching is recommended if you poll often.
No. It is a read-only data and analytics API. Trade on the venues themselves.
It compares binary markets across venues that look like the same question and reports the guaranteed edge. A separate dutch book scanner checks multi-outcome events on a single venue.
No. Arbitrage, consensus and Kelly outputs are informational tools. Always verify live prices and liquidity before trading.
To obtain your API key, first sign in to your account and navigate to the API you want to use. From the API's Pricing section, choose a plan and complete the subscription process. Once subscribed, return to the API page and you will see your API Access Key displayed at the top of the documentation page. You can use this key to authenticate your requests.
You can’t switch APIs during the free trial. If you subscribe to a different API, your trial will end and the new subscription will start as a paid plan.
The free trial lasts for 7 days and allows you to make up to 50 API requests.
No, the free trial is available only once, so we recommend using it on the API that interests you the most. Most of our APIs offer a free trial, but some may not include this option.
Yes. If the API offers a free trial, you will see a "Free 7-Day Trial" option in its Pricing section. The trial lasts for 7 days and allows up to 50 API requests, enabling you to evaluate the API before subscribing to a paid plan.
Zyla API Hub is like a big store for APIs, where you can find thousands of them all in one place. We also offer dedicated support and real-time monitoring of all APIs. Once you sign up, you can pick and choose which APIs you want to use. Just remember, each API needs its own subscription. But if you subscribe to multiple ones, you'll use the same key for all of them, making things easier for you.
You can monitor your API usage through the response headers included with every request:
x-zyla-api-calls-monthly-used: Shows the total number of API requests you have used during the current billing period.
x-zyla-api-calls-monthly-remaining: Shows the number of API requests you have remaining for the current billing period.
Yes, you can cancel your subscription at any time. Simply go to the Pricing section of the API you're subscribed to and click the "Unsubscribe" button.
Please note that upgrades, downgrades, and cancellations take effect immediately. Once your subscription is canceled, access to the service will end immediately, regardless of any remaining API calls in your quota.
Please have a look at our Refund Policy: https://zylalabs.com/terms#refund