Funding arbitrage is earning from the periodic payments between the two sides of a perpetual future, in a way where the asset's price is irrelevant to you. You hold a delta-neutral position (long spot + short perp). The price can rise or fall and it barely touches your balance, while income drips in from the funding rate. It's one of the few arbitrage types that needs no cross-exchange coin transfer and doesn't depend on market direction. Below: what funding is, how to build the delta-neutral route, why payout cadence across venues decides everything, what basis is, how to compute break-even, and the risks. With an APR worked out in numbers.
What the funding rate is
A perpetual future (perp) is a contract with no expiry. To keep its price from drifting away from spot, the exchange introduces a funding rate - a periodic payment between longs and shorts:
- When the perp trades above spot (market leans long), funding is positive: longs pay shorts.
- When the perp trades below spot (market leans short), funding is negative: shorts pay longs.
The rate is a percentage of position notional, transferred at each funding event. In a bull market funding on most assets is persistently positive - there are more longs, and they keep paying shorts. That payment is exactly what an arbitrageur collects by going short, but without directional risk - thanks to a spot hedge.
The delta-neutral setup: long spot + short perp
The base funding-arbitrage route when funding is positive:
- Short the perp on asset X - for this you receive funding (since longs pay shorts).
- Long the spot of the same asset X for the same amount - this is the hedge: if X rises, the perp short is down, but spot is up by exactly as much.
Total delta (price sensitivity) is near zero: X rising or falling doesn't move your capital, because the legs offset each other. And funding keeps accruing on the short leg every period. In effect you turn the funding rate into a near-interest yield on deployed capital, stripped of market risk.
Delta-neutral works both ways: under persistently negative funding the setup flips - long the perp (you receive funding as shorts pay longs) + short spot (hedge). In practice persistently negative funding is rare, so the base case is long-spot / short-perp on positive funding.
Why payout cadence decides everything
This is where beginners lose the edge. A 0.01% rate on one exchange is not equal to 0.01% on another, because exchanges pay funding at different cadences:
| Exchange | Cadence | Payouts per 24h |
|---|---|---|
| Hyperliquid | 1 hour | 24 |
| EdgeX | 4 hours | 6 |
| Binance, Bybit, OKX, MEXC | 8 hours | 3 |
The intervals in the table are a snapshot at the time of writing: exchanges change cadence, introduce dynamic funding and hourly windows on individual contracts, so always verify the current interval for your pair on the exchange itself, not from memory.
The point is simple: the same rate on an hourly-paying venue and on an 8-hourly one is a multiple-fold difference in daily funding, not an identical number. Comparing raw on-screen percentages head-on is a classic mistake. You only compare normalized rates correctly. The full breakdown of normalizing to a common window, with the formula and examples, is in funding math. The takeaway for the route: the cadence asymmetry between venues is often what creates the window - a perp-vs-perp between a high-cadence and a low-cadence venue can yield positive net funding.
Basis and convergence
Basis is the gap between the perp price and the spot price. Funding is precisely the mechanism that keeps basis near zero: as long as the perp is above spot, positive funding incentivizes shorting the perp and squeezing the basis back. For an arbitrageur, basis matters for two reasons:
- At entry you lock in the current basis. If the perp is meaningfully above spot, entering short-perp + long-spot earns extra profit on convergence (basis pulls back to zero), on top of the funding itself.
- At exit the basis should converge back, otherwise closing both legs at an unfavorable basis eats part of the funding income. On liquid assets the basis converges reliably. On thin ones it can diverge unpredictably.
A perp↔spot route on one exchange that closes through basis convergence is a variety of futures arbitrage. In pure funding arbitrage the basis is secondary, and the main income is the stream of funding payments.
Break-even: what's subtracted from funding
Funding is a gross income, and like any spread, costs are subtracted from it:
- Entry and exit taker fees. You open two legs and close two - that's four trades, ~0.1% each. Round trip easily adds up to 0.2–0.4% of notional. To recoup them, funding must accrue over several periods.
- Negative funding in a bad hour. Funding isn't guaranteed: the rate floats and can turn against you on individual periods. The income is the sum of payments over the holding time, not a fixed figure.
- Cost of frozen capital. Both legs reserve collateral and spot. Efficiency depends on the margin mode - see cross vs isolated margin.
The takeaway: you hold the route not for one period but until accumulated funding has confidently covered the entry-exit fees. Re-opening the position too often kills the return through fees.
Example: working out a funding route's APR
Take an asset with a persistently positive funding of 0.01% per 8-hour period on a liquid exchange. Notional per leg is $10,000 (short perp $10k + long spot $10k, ~$20k capital deployed in total).
Route: SHORT $10k perp + LONG $10k spot (delta-neutral) Capital deployed: ~$20,000 Funding: +0.01% per 8h → 3 payouts per day Daily funding: 3 × 0.01% × $10,000 = $3.00 / day Annual funding: $3.00 × 365 = $1,095 / year ── APR on short notional ($10k) ── $1,095 / $10,000 = ~10.95% per year ── APR on deployed capital (~$20k) ── $1,095 / $20,000 = ~5.5% per year ── Minus entry/exit costs (one cycle) ── 4 trades × 0.1% × $10k = $40 (one-off) Recouped in: $40 / $3.00 ≈ 14 days of holding
The takeaway: "10% APR" sounds attractive, but on deployed capital it's ~5.5%, and the entry-exit fees take almost two weeks of holding to recoup. The route makes sense with stable funding and a sufficient horizon. With a rate hovering around zero, or with a short hold, costs eat the income. At a bull-market peak rates can be several times higher (0.05–0.1%+ per period), and then the APR flies into the tens of percent - but that's a temporary window, not the norm.
Risks of funding arbitrage
- Hedge-leg liquidation. If the perp short is on thin isolated collateral, a sharp pump liquidates it - and you're left with a naked spot long, the delta-neutrality broken. Solved by margin mode (cross / portfolio) and a collateral buffer - see the margin breakdown.
- Funding sign flip. The rate can reverse: you expected to receive and started paying. You need to monitor and close the route when the normalized rate turns negative.
- Basis divergence at exit. On illiquid assets, closing both legs at an unfavorable basis eats part of the income.
- Exchange counterparty risk. Capital sits on a derivatives venue, and the exchange's own risk doesn't go away.
This is not investment advice. Funding arbitrage uses leverage on the perp leg and carries liquidation risk under insufficient collateral or sharp volatility. The funding rate is not guaranteed and can flip sign. Real return depends on the normalized rate, entry-exit fees, the margin mode, and basis convergence.
Related: the pillar Crypto arbitrage guide, normalizing rates of different cadence in funding math, collateral modes and liquidation risk in cross vs isolated margin, the general mechanics in futures arbitrage. Common failures - crypto arbitrage mistakes. Live funding rates and spreads across 20+ exchanges - in the funding dashboard and the spread scanner.