Crypto
Perpetual Funding Rate Arbitrage
A perpetual futures contract never expires, so exchanges pay traders on one side to keep its price anchored to spot. Hedge out the price risk entirely and what's left is just that payment, collected on a clock.
Run the funding clock
Set the funding rate and which side is paying, then run the clock. A funding payment settles every 8 hours regardless of what price does in between. The position is hedged, so price moves show up only as small basis noise, not as real exposure.
Position: long spot, short perpetual. Longs pay shorts every interval, this position collects.
How it works
- A perpetual futures contract has no expiration, so nothing forces its price back to spot. Exchanges solve this with a funding payment exchanged directly between long and short holders every few hours, sized to whichever side needs an incentive to trade the perp back toward spot.
- The trade is holding spot and the perpetual in opposite directions at the same size. Long spot and short perp cancel each other's exposure to the underlying's price. Whichever way the price moves, the spot leg and the perp leg move against each other almost one-for-one.
- What's left after the hedge is just the funding payment. Delta-neutral means the position isn't taking a view on direction at all, its entire return comes from collecting (or in a mismatched position, paying) funding every interval.
- Tiny per-interval rates compound into a real annualized number. A funding rate that looks negligible at 0.01% every 8 hours works out to roughly 11% a year if it holds steady, which is the entire reason this strategy exists as more than a rounding error.
Where this breaks
The hedge is never quite as neutral as it looks, and funding can flip
Spot and perpetual prices track each other closely but not perfectly, execution timing, exchange fees, and the basis between the two legs all introduce small slippage that the "basis noise" in the simulation above is standing in for. More importantly, funding rates aren't fixed, they respond to market positioning and can compress toward zero or flip sign entirely once enough capital crowds into the same trade, since the payment exists specifically to correct an imbalance that the arbitrage itself helps close. A position built around today's funding rate can find that rate gone, or working against it, well before the trade is unwound.