Extended vs Polymarket

Funding is signed. Positive means longs pay shorts, negative means longs get paid to hold. Venues settle on different native periods (hourly on Hyperliquid, dYdX, Lighter, Extended, Pacifica, Ondo, Vest, StandX and ApeX, every 4h on edgeX, every 8h on Kalshi, Aster and the CEX books); every figure is normalized from the venue's own quoted rate and interval before ranking. Funding is only the holding cost. Opening costs (taker fee, spread, impact) are the companion bench perp-fees.

The ratio is a screen, not a verdict. Both terms are the venue's own figures (24h volume and open interest as each API reports them, in USD), so a venue that counts both legs of a fill moves its ratio without changing anything real. A very low ratio (Ostium, 0.2x) means positions held for days on thin daily volume; a very high one (Kalshi, above 40x) means a day of trading dwarfs what stays open. The bands in the methodology say what each range usually means.

Every row is a month of funding at the venue's average daily cost over the hours measured in the trailing 30 days (average x 30). A venue ranks only with 576 of the 720 hours (24 days) behind that average; under the floor the row is provisional, unranked, and shows its day count (the venues added on 2026-09-22 and 2026-09-23 start there). Funding is signed: on a month where shorts paid longs the figure is negative and "cheapest" means "was paid the most".