One API.All Prediction Markets.Normalized Data.
Stop juggling 3 APIs. Get unified data from Polymarket, Kalshi & Gemini in a single call. Ship faster. Trade smarter.
Why waste time on integration?
Stop building the same API adapter three times. We handle the complexity so you can focus on what matters.
Without PredictAPI
- 3 separate APIs
- 3 auth systems
- 3 data formats
- Manual arbitrage hunting
- Hours of integration
With PredictAPI
- 1 unified API
- 1 API key
- Normalized JSON
- Auto opportunity detection
- 5 minutes to first call
Data from the best sources
We aggregate and normalize data from the leading prediction market platforms.
Polymarket
Crypto-native prediction markets
Kalshi
CFTC-regulated exchange
Gemini
Gemini prediction markets
See it in action
Simple REST API. Clean JSON responses. Try it yourself.
/v1/markets?category=politics&limit=3{
"data": [
{
"id": "pm_trump_2028",
"source": "polymarket",
"question": "Will Trump win 2028?",
"category": "politics",
"status": "open",
"outcomes": [
{ "name": "Yes", "probability": 0.52 },
{ "name": "No", "probability": 0.48 }
],
"url": "https://polymarket.com/event/..."
},
{
"id": "ks_fed_rate_jan",
"source": "kalshi",
"question": "Will the Fed cut rates in January?",
"category": "finance",
"status": "open",
"outcomes": [
{ "name": "Yes", "probability": 0.35 },
{ "name": "No", "probability": 0.65 }
],
"url": "https://kalshi.com/markets/..."
},
{
"id": "gm_btc_100k",
"source": "gemini",
"question": "Will BTC be above $100K on Dec 31?",
"category": "finance",
"status": "open",
"outcomes": [
{ "name": "Yes", "probability": 0.68 },
{ "name": "No", "probability": 0.32 }
],
"url": "https://exchange.gemini.com/prediction-markets/..."
}
],
"meta": { "total": 2533, "limit": 3 }
}Built for your use case
Whether you're building trading tools, research platforms, or media products.
Arbitrage Detection
Find price gaps across platforms. Buy low on one, sell high on another.
Trading Bots
Automate trades based on market movements and probability changes.
News & Media
Embed live prediction odds in articles. Show readers what markets think.
Research
Track prediction market accuracy. Analyze forecasting performance.
Ready to aggregate
prediction markets?
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