Every tick of every prediction market
Tick-level orderbook history, the fastest WebSocket, and analytics indexed straight from the blockchain. Polymarket, Kalshi, and every major venue — one API.
Institutional-grade prediction market data
Captured from our own nodes and indexed from the chain — trade and price history back to 2020, and an always-on tick recorder capturing every orderbook event.
Trusted by
Top prediction market apps run on Predexon
Terminals, trackers, and analytics products across the ecosystem are built on our data.
Polymarket
Kalshi
Opinion
Limitless
Predict.fun+ Binance reference data01 / Orderbook tick history
Replay the book.
Every tick.
The most granular historical orderbook data in prediction markets — the dataset no real-time feed keeps. Reconstruct full depth at any captured timestamp and backtest queue position, quote aggressiveness, and fill probability against what the market actually showed.
Every single granularity
The raw tick stream itself — every placement, update, cancel, and fill. Aggregate down to any resolution; never the other way around.
Complete, finalized daily
Full history across Polymarket, Kalshi, and Opinion, finalized through the previous day. Filter by market to pay only for what you need.
Priced before you pay
Quote any slice for free, then download compressed Parquet via signed URLs. Re-downloads within 24 hours are free.
# Quote any slice — free
GET /v2/data/ticks/quote
# Download as Parquet
GET /v2/data/ticks?quote_id=…02 / Real-time WebSocket
The fastest WebSocket in prediction markets
Mempool-aware streams push every Polymarket trade, price, and orderbook update before it confirms — up to 5 seconds ahead of Polymarket's own real-time data service. See flow before it lands on-chain, with no surprise egress bills.
03 / Analytics
Indexed straight from the blockchain
Wallet analytics, PnL, smart-money signals, and leaderboards — accurate to the block, not scraped from a UI. The deepest wallet intelligence in prediction markets.
04 / REST API
Clean and effortless APIs
Build your first request in seconds. Markets, trades, orderbooks, wallets, leaderboards — one key, every venue.
import requests
response = requests.get(
"https://api.predexon.com/v2/polymarket/markets",
headers={"x-api-key": "<your-api-key>"},
params={"search": "fed", "status": "open"},
)
markets = response.json(){
"markets": [{
"question": "Will the Fed cut rates in September?",
"venue": "polymarket",
"status": "open",
"yes_price": 0.64,
"no_price": 0.36,
"volume_24h": 1842530.22,
"liquidity": 912874.10,
"end_date": "2026-09-17T18:00:00Z",
}]
}Start building today
Tick-level orderbook history, the fastest WebSocket, and blockchain-indexed analytics for every major prediction market — through one clean, predictable API.
