Funding Rate

💡 Bottom Line A crypto perpetual-futures backtest fails live for five reasons, but only two are crypto-specific: notional-based funding drag and silent data gaps. Fix those here. The other three (limit-fill illusion, slippage and latency, look-ahead bias via joins) are universal backtest sins that apply to stocks, FX, and futures alike. We measured each one with real data in the Backtest Autopsy series, so this guide links out instead of repeating them. The funding numbers below are worked calculations from stated assumptions, not a measured study. The measured forensics live in the linked spokes. This is a methodology guide, not a forensic report. Where a claim needs measured proof, we point to the specific Backtest Autopsy spoke that measured it, rather than reproducing numbers here. ...