Polymarket 300ms Order Book Data: Sub-Second Market History
Learn why 300ms Polymarket order book data matters for backtesting, slippage modeling, spread analysis, and crypto Up/Down market research.
Polymarket 300ms order book data gives you a sub-second view of how prediction-market depth changes. For fast Up/Down markets, one-minute snapshots can hide the spread expansions and depth shifts that determine whether a strategy is tradable.
Why 300ms Resolution Matters
- Captures short-lived bid/ask changes during volatile moves
- Improves fill simulation for fast BTC, ETH, and SOL markets
- Shows liquidity disappearing near thresholds and market close
- Preserves order book states that minute-level data may skip
300ms vs 1-Minute Snapshots
| Analysis task | 1-minute data | 300ms data |
|---|---|---|
| General trend analysis | Usually enough | Works |
| Scalping backtests | Too coarse | Better fit |
| Slippage modeling | Often distorted | More realistic |
| Spread spike detection | Often missed | Captured |
When You May Not Need 300ms Data
If you are writing a broad educational article or doing daily summary analysis, minute-level data may be sufficient. If you are testing actual execution, market making, scalping, or event-driven entries, the extra resolution helps avoid false confidence.