Funding rates vs. overnight swap: the structural difference
Perpetual futures on centralised exchanges like Binance and Bybit use a funding rate mechanism to anchor the perpetual price to spot. Every 8 hours, traders on one side pay the other: when the perpetual trades at a premium, longs pay shorts; when it trades at a discount, shorts pay longs. This payment flows between traders—the exchange takes no cut. CFD brokers, by contrast, charge a fixed overnight swap of 0.04–0.08% of position value per day regardless of market sentiment.
When perpetuals are cheaper to hold long
During sideways or bearish markets, perpetual funding rates frequently go negative—shorts pay longs. A trader holding a long Bitcoin position on Bybit during negative funding receives a payment every 8 hours rather than paying one. In periods of Bitcoin consolidation through 2025, funding rates averaged close to zero, meaning the perpetual was often cheaper to hold long than a CFD. Check the annualised funding rate on any major exchange's funding history before choosing your instrument.
When CFDs are more cost-effective
During bull markets with sustained positive funding, rates can spike to 0.10–0.30% per 8-hour period—annualised, that is 109–328%. Holding a long perpetual position during a funding spike costs multiples of what a CFD charges. If you anticipate a directional move over one to two weeks and funding is elevated, the CFD's fixed daily swap becomes the cheaper option. The break-even: CFD daily swap ÷ (current 8-hour funding rate × 3) gives you the holding period where costs equalise.
Counterparty and custody risk
Perpetual futures on centralised exchanges expose you to exchange insolvency risk—FTX's collapse in November 2022 wiped billions in client funds. CFDs at an FCA or ASIC-regulated broker offer regulatory segregation of client funds, FSCS compensation up to £85,000 in the UK, and mandatory NBP. The regulatory protection of a CFD is priced into the wider spread and higher overnight fees, but for traders who cannot absorb counterparty losses, it is a material advantage.
Basis risk: mark price versus spot
CFD brokers price their crypto CFDs from underlying spot feeds (Bitstamp, Coinbase). Perpetuals track their own mark price derived from an index of spot exchanges. In normal conditions, both stay close to spot. During liquidation cascades—flash crashes driven by forced deleveraging—perpetual mark prices can diverge sharply from spot, triggering stop-outs at prices that never existed on any spot exchange. CFD brokers using spot feeds are less exposed to this, though not entirely immune.
Practical decision framework
Use perpetuals when: funding rates are negative or near zero, you already have exchange accounts set up, position size exceeds CFD broker margin limits, or you need cross-margin with other crypto positions. Use CFDs when: funding rates are elevated above your expected holding-period cost, you want regulated protection and NBP, you are trading smaller sizes, or you need positions on a regulated broker statement for tax or reporting purposes.