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Everything in this tab is built for one job: giving you the data and signals you need to find edges in prediction markets. Markets, prices, orderbook history, trades, positions, wallet P&L, smart-money flow, and live streaming — all behind one API key, normalized across Polymarket, Kalshi, Limitless, Opinion, Predict.fun, and Binance.
Most of what’s here is free and unlimited. All list-market and orderbook-history endpoints don’t count toward your monthly quota on any plan. See the full free-endpoint list →

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Your first call

curl -H "x-api-key: YOUR_API_KEY" \
  "https://api.predexon.com/v2/polymarket/markets?status=open&sort=volume&limit=5"

import requests

r = requests.get(
    "https://api.predexon.com/v2/polymarket/markets",
    headers={"x-api-key": "YOUR_API_KEY"},
    params={"status": "open", "sort": "volume", "limit": 5},
)
for m in r.json()["markets"]:
    print(m["title"])

const res = await fetch(
  "https://api.predexon.com/v2/polymarket/markets?status=open&sort=volume&limit=5",
  { headers: { "x-api-key": "YOUR_API_KEY" } }
);
const { markets } = await res.json();
markets.forEach(m => console.log(m.question));
New here? Walk through the full setup in Quickstart →

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What’s in this tab

Cross-Venue Search

Text search and programmatic matching across every venue — find the same question on Polymarket, Kalshi, Limitless, Opinion, and Predict.fun.

Markets

List markets and events across all venues, plus live lifecycle events (creation, resolution) over WebSocket.

Pricing & Candles

Spot price, OHLCV candlesticks (1m–1d), volume curves, open interest, Binance reference candles, and Chainlink crypto streams.

Orderbooks

Historical orderbook snapshots across venues plus the live L2 WebSocket stream for Polymarket.

Trades

Full historical trade tape (Polymarket, Kalshi) plus live trades and mempool pending-trade signals over WebSocket.

Ticks

Raw, tick-level price changes and orderbook deltas as bulk Parquet — every update at full resolution, across Polymarket, Kalshi, and Opinion. New.

Activity & Positions

On-chain activity (splits, merges, redemptions, NegRisk conversions), position snapshots, and the live activity WebSocket channel.

Wallets & P&L

Wallet profiles, positions, realized + unrealized P&L, similar-wallet discovery, and connected-wallet clusters on Polymarket.

Smart Money & Leaderboards

Profitable-wallet positioning, top holders, smart-activity-per-market, global + per-market leaderboards, cohort stats.

Oracle & Settlement

UMA resolution markets and live oracle + collateral events for tracking how questions resolve.

Backtesting

Replay historical orderbook state, reconcile candles with the trade tape, and backtest signals against the pending-trade leading indicator.

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Common recipes

List trending markets

GET /v2/polymarket/markets?sort=volume

Search across venues

GET /v2/markets/search?q=trump

Fetch OHLCV candles

GET /v2/polymarket/candlesticks/{condition_id}

Orderbook history

GET /v2/polymarket/orderbooks

Wallet P&L (free)

GET /v2/polymarket/wallet/pnl/{wallet}

Smart-money for a market

GET /v2/polymarket/market/{condition_id}/smart-money

Find matching markets

GET /v2/matching-markets?polymarket_market_slug=...

Stream pending trades

Subscribe with filters.status: "pending" on the trades channel.

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Authentication & limits

All endpoints in this tab live on https://api.predexon.com and authenticate via the x-api-key header. See Authentication and Rate limits in Start Here for plan details, free-endpoint lists, and best-practice patterns (caching, retries, connection pooling).