Tick data
Polymarket tick data
Every tick of Polymarket's 5-minute crypto Up or Down order books and trades, timestamped to the millisecond by the exchange and by our recorder.
What “tick” means here
A new row every time the best or second-best bid or ask changes on either outcome, plus a once-a-second snapshot with sizes. When several messages arrive in the same exchange millisecond, the row is the final state for that millisecond. On 19 October 2026 the Bitcoin market alone produced 523,560 book rows and 374,367 trades.
Timestamps
exch_ts_ms: Polymarket's timestamp on the message.recv_ts_ms: when our recorder received it. Median difference: about 9 ms.window_startandelapsed_ms: where the tick sits inside its 5-minute window.
Use it for
Fill simulation against real size, latency modelling, spread and depth studies through the window, and measuring how fast the book reacts to a move in the coin. Start with the backtesting data overview or the free sample.