PolyTest is a Polymarket backtesting API that lets traders replay historical orderbooks and test trading strategies on crypto prediction markets. Every snapshot includes bid/ask prices, mid price, spread, volume, and full orderbook depth — timestamped to the millisecond. Think of it as a DVR for Up/Down markets: you can rewind to any point and see exactly what the market looked like.PolyTest is a Polymarket backtesting API that lets traders replay historical orderbooks and test trading strategies on crypto prediction markets. Every snapshot includes bid/ask prices, mid price, spread, volume, and full orderbook depth — timestamped to the millisecond. Think of it as a DVR for Up/Down markets: you can rewind to any point and see exactly what the market looked like.