Every 8 hours, perpetual futures exchanges transfer money between longs and shorts — the funding rate. When the market leans long, longs pay shorts. Funding arbitrage collects these payments while holding no directional risk: short the perp, hold the same amount of spot. Price goes up or down — one leg's gain offsets the other's loss, and the funding keeps arriving.
The mechanics in one example
Coin X funding is +0.08% per 8h on a bull-frenzy day. You buy $1,000 spot and short $1,000 on the perp. Every 8 hours you collect ~$0.80; over a day ≈ $2.40 on $2,000 deployed — roughly 40%+ annualized while it lasts. Rates like that persist for hours or days around hype events, then normalize to ~0.01%.
Where the risk actually lives
- Liquidation of the short leg. A violent pump can liquidate your perp before you rebalance. Use low leverage (2× max) and keep margin topped up.
- Funding flips. Rates go negative — suddenly you're the payer. Exit when the rate normalizes; this isn't a hold-forever position.
- Cross-exchange divergence. Funding differs across exchanges for the same coin — the richest version of this trade shorts the venue with the highest rate. Comparing rates manually is tedious; a futures scanner shows cross-exchange divergences in one table.
Who this strategy fits
Funding arb is slower and steadier than spot loops from our USDT arbitrage guide — fewer actions, longer holds, returns scale with capital. Many traders run both: spot loops for volatile hours, funding positions for the quiet ones. Start small, watch one full funding cycle before scaling, and track rates rather than guessing them.
Educational content, not financial advice. Perpetual futures involve leverage and liquidation risk.