What perpetual funding is and why it exists
Perpetual futures do not expire. Unlike a quarterly futures contract, a perp can be held indefinitely. The mechanism that keeps the perp price anchored to spot is the funding rate: a periodic payment that longs pay to shorts (when the perp trades at a premium to spot) or that shorts pay to longs (when the perp trades at a discount).
Funding is not a fee charged by the exchange. It is a transfer between the two sides of the market. If the perp is trading above spot because everyone wants to be long, longs pay shorts to stay in the trade. The payment creates selling pressure on the perp and buying pressure on spot, mechanically pulling the prices back together.
Funding rate arbitrage is simply collecting that payment systematically by sitting on the short side with a delta-neutral hedge.
How the trade is structured
The structure is straightforward: for every dollar of short exposure in the perpetual, you hold an equivalent dollar of long exposure in spot.
Delta-neutral funding trade — $10,000 position
Long $10,000 BTC spot (on exchange or self-custody)
Short $10,000 BTC perpetual (on exchange, cross or isolated margin)
Net delta = $10,000 spot − $10,000 perp short = $0
Bitcoin price movement: up $1,000 → spot gains $1,000, perp short loses $1,000 → net $0
Bitcoin price movement: down $1,000 → spot loses $1,000, perp short gains $1,000 → net $0
The dollar return comes entirely from funding payments received on the short leg. At 0.01% per 8 hours (the approximate Bybit/Binance baseline in a neutral market), the gross annualized rate is:
Annualized funding rate calculation
0.01% per 8h × 3 payments/day × 365 days = 10.95% gross/year
During bull markets, rates of 0.05–0.1%+ per 8h are common → 55–110% gross annualized
During bear markets or neutral conditions, rates often drop to 0.001–0.005% → 1–5% gross
From the gross rate, subtract trading fees on entry and exit, and you have your net yield.
Fees and net return
The fee drag on this trade is meaningful and depends heavily on your volume tier and order type.
Net yield calculation — $10,000 at 0.01%/8h funding on Bybit
Gross annualized funding: +10.95%
Entry fees (taker spot + perp): −0.15%
Exit fees (taker spot + perp): −0.15%
Estimated basis drift: −0.30%
Net yield (approx): ~10.35% annualized
Using maker orders on both legs drops entry+exit fees to ~0.04%, improving net by ~0.26%
Using maker limit orders on both legs (rather than market orders) makes a real difference on the entry and exit fees. On Bybit, maker fees are 0% on spot and 0.01% on perp for most users. The trade is far more attractive with patient, limit-order entries.
See exact fee impact before entering →
Use our Trading Fee Calculator to compute your per-trade fee cost on any exchange, in dollar terms and as an R multiple, so you know the break-even funding rate before committing capital.
The risks that end the trade
Funding rate arbitrage is often described as "near risk-free income." That framing is misleading. The risks are real and have ended many traders.
Funding rate goes negative
Funding is not always positive. During bear markets or periods of heavy selling, the perp trades below spot. Now shorts pay longs, meaning your position earns nothing and pays a fee. If you entered at 0.05%/8h during a bull run and rates drop to −0.02%/8h, your "income" trade becomes a cost. You either close at a loss on fees, or wait and hope rates reverse.
Basis risk
The perp does not always track spot exactly in real time. In fast markets, the spread between spot and perp can widen significantly before converging. During a flash crash, spot can drop faster than the perp liquidation engine clears. This produces unrealized losses on the combined position even though the theoretical delta is zero. If the position is on margin, this can trigger liquidation before the spread closes.
Short leg liquidation
The short perp position requires margin. If the asset dumps 30% in an hour, the spot long gains 30% but the short leg may get liquidated before you can add margin or close both legs simultaneously. The gap between spot movement and perp liquidation is where traders lose money even on a "hedged" trade. Use low leverage (1x–2x) on the short leg and keep buffer margin in the account.
Exchange counterparty risk
Both legs typically live on the same centralized exchange. If the exchange is hacked, insolvent, or freezes withdrawals (as FTX did in November 2022), you lose access to both the spot and the margin simultaneously. The hedge is meaningless if the exchange itself fails. Spreading across multiple exchanges or keeping spot in self-custody mitigates this, but introduces basis complexity.
When the trade makes sense vs. when to skip it
Not every funding environment justifies the capital commitment and operational overhead.
Rule of thumb thresholds
Gross funding rate > 15% annualized: Trade is interesting
Gross funding rate > 30% annualized: Trade is clearly attractive
Gross funding rate 5–15% annualized: Marginal after fees; compare to stablecoin yields
Gross funding rate < 5% annualized: Skip; stablecoin lending earns more with less operational complexity
Thresholds assume you use maker orders and keep both legs on the same exchange
The trade also competes with simpler alternatives. DeFi lending protocols and centralized yield products often pay 5–8% on stablecoins with far less setup. Funding arbitrage only beats them when rates are high enough and stable enough that the extra operational work is worth it.
Watch the funding rate trend, not just the current rate. A rate that was 0.05%/8h last week and is 0.01%/8h today is likely continuing to fall as the market cools. Entering at the tail end of a funding rate spike and then holding through a reversal is the most common way to lose money on this trade.
Practical setup on Bybit
The most common implementation for retail traders uses Bybit's spot and perpetual markets on the same account.
- →Buy spot BTC via limit order (spot wallet). Use maker to pay 0% spot fee.
- →Open a short BTCUSDT perpetual in the unified margin account, equal notional value. Use 1x leverage. Use limit order at ask for maker fill.
- →Monitor funding payments: credited/debited every 8 hours. Track net cumulative vs. fee spend.
- →Set a funding rate alert below your break-even threshold. If rates drop below 0.003%/8h, review whether to close.
- →Maintain buffer margin in the unified account: at least 20–30% above maintenance margin on the short leg to survive a fast market without forced liquidation.
The key operational discipline is closing both legs simultaneously when you exit. Closing one leg first leaves you directionally exposed. In a fast market, the gap between closing the spot and closing the perp can cost more than several days of funding income.
Summary
- Funding rate arbitrage holds long spot and short perpetual in equal notional size, capturing funding payments that longs pay to shorts when funding is positive
- Gross annualized rate depends entirely on the funding rate; subtract maker fees on entry and exit to get net yield
- The trade is not risk-free: funding can flip negative, basis risk can produce unrealized losses, the short leg can be liquidated, and exchange counterparty risk is real
- Use 1x leverage on the short leg with substantial buffer margin to survive rapid moves before the hedge re-converges
- The trade only beats alternatives when gross funding exceeds ~15% annualized; below that, simpler yield products are competitive with less overhead
- Monitor funding rate trends, not just the current level; entering at the tail of a spike is how most losses happen on this strategy
Frequently asked questions
What is funding rate arbitrage?
Funding rate arbitrage (also called cash-and-carry or basis trading) involves holding an equal and opposite position in the spot and perpetual futures markets. You go long spot and short the perpetual. If funding is positive, the perpetual longs pay shorts — so your short leg receives a continuous stream of funding payments. The combined position is delta-neutral, meaning price moves cancel out, and your return is the funding rate minus fees and basis drift.
Is funding rate arbitrage risk-free?
No. Funding rate arbitrage carries several real risks: the funding rate can go negative, eliminating the return and flipping it into a cost; basis risk means the spot price and perpetual price can temporarily diverge, producing paper losses on the combined position; exchange risk means your capital on the exchange could be lost to a hack or insolvency; and liquidation risk on the short leg exists if the spread between spot and perp expands violently on the downside.
What annualized return does funding rate arbitrage produce?
During bull market conditions with persistently positive funding, annualized returns of 10–30% have been achievable. During neutral or bear markets, funding rates drop or go negative and the trade often earns less than stablecoin lending rates. The return is highly cyclical — it peaks during crypto euphoria and compresses when sentiment cools.
How do I calculate the net yield on a funding rate trade?
Net annualized yield = (funding rate per 8h × 3 × 365) − (entry fee + exit fee expressed as annual rate) − estimated basis drift cost. For example, a 0.01% per 8h funding rate on Bybit produces roughly 10.95% annualized gross. Subtract round-trip fees (typically 0.02–0.06% on maker/taker) and you get your net yield before accounting for basis drift.
How do funding rates work on Bybit, Binance, and Hyperliquid?
On Bybit and Binance, funding is settled every 8 hours at 00:00, 08:00, and 16:00 UTC. Hyperliquid settles every hour. The rate is calculated from the premium between the perpetual price and the spot index. Positive funding means longs pay shorts. The exact formula differs by exchange but all converge to anchoring the perp price to spot over time.
Calculate your actual net yield before entering
Use our free Trading Fee Calculator to see exactly what Bybit, Binance, Hyperliquid, or any other exchange costs you per round trip, expressed as a percentage of position — so you can subtract it from the gross funding rate before committing capital.