TradingBTC
BTC perp cost slope: tightest books, flattest slopes
As of September 18, 2026, Gains leads BTC cost slope ($1M / $1k) at 1.000x (p50, 24h window), measured across 7 providers.
BTC carries the highest open interest on most venues and typically has the tightest spread at any given notional. Orderbook venues therefore show their flattest slopes on BTC: the $1M impact is minimised by depth. Oracle-priced venues (gains, gmx) remain at exactly 1.00 regardless.
BTC leaderboard
Live p50 over the last 24 hours, scoped to BTC only, ranked lowest first. Cross-region average; the regional breakdown below shows where leaders diverge.
Methodology, charts and the full ledger live on the Perp DEX cost invariance: all-in bps at $1M vs $1k, live slope ranked page. Raw data: JSON endpoint.