The Funding Carry: How Perpetual Funding Pays You to Hold the Right Side

There's a trader who ran a BTC-PERP short for most of August last year. He didn't particularly have a view — the technicals were sideways, the macro was mixed, and the directional conviction wasn't there. What he had was an observation: for seven of the previous ten 8-hour funding windows, longs had been paying shorts a positive rate because the perp was trading at a slight premium to spot. His short, held through the whole month, didn't profit from a price move (BTC closed roughly flat). It profited from funding — about 1.4% of position notional, extracted purely for being on the paid-to-hold side.

That's the funding carry. It's not a thesis, it's not a pattern, it's a payment mechanic that works out when the perp's price pressure is on one side and you're happy to be on the other.

The mechanic in one paragraph

A perpetual future doesn't have an expiry, so there's no settlement to force its price to converge with the underlying. The funding rate is the lever that does that work: it's a periodic payment between longs and shorts, computed from the premium or discount of the perp to its reference. When the perp trades above spot, longs pay shorts (positive funding); when below, shorts pay longs (negative funding). The crowd that's long during a persistent premium is paying the crowd that's short to maintain the market balance. If you have a view, funding is a tax or a bonus on top of your P&L; if you don't have a view, funding alone can be a trade.

The three sign conventions on JTX

This is where traders get confused, because different asset classes handle the mechanics differently, and the direction of payment flips.

Crypto perps — 8-hour funding (settles every 00:00, 08:00, 16:00 UTC):

• Positive funding rate: longs pay shorts. Perp is trading at a premium to the spot reference.
• Negative funding rate: shorts pay longs. Perp is trading at a discount.
• Settled every 8 hours into realized P&L. Rate quoted as a percentage of notional per settlement.
• A trader holding a short through a +0.01% 8-hour funding on a $100K BTC-PERP position receives $10. Across a day, three settlements of similar magnitude earn $30 passively.

Forex perps — overnight swap (settles once daily at 22:00 UTC):

• Based on the interest-rate differential between the two currencies in the pair.
• Long AUDUSD: AUD rate (higher) minus USD rate — currently positive, so long AUDUSD earns swap.
• Short AUDUSD: inverse — short AUDUSD pays swap.
• Same mechanic as the FX forward curve, exposed as a per-day cost or credit on your position.
• A trader long AUDJPY (both legs rate-differential-positive) earns daily swap; the same trader long USDJPY earns a smaller daily swap because the USD-vs-JPY rate differential is tighter.

Equity perps — daily carry:

• The underlying is a cash equity, which has no inherent carry — but holding leveraged exposure costs the risk-free rate.
• Long AAPL-PERP: pays a daily carry roughly equal to the risk-free rate × notional ÷ 365.
• Short AAPL-PERP: receives the carry (short-sellers are effectively lending the underlying).
• Settled daily. The amount is small per-day but material over months.

The important thing is that the direction depends on both the asset class and your side. There's no universal "longs pay" rule across all perps. The funding rates tool shows the current rate for every symbol so you can check which side is being paid before you take a position.

For a deeper walk-through on equity-specific funding mechanics, the earlier equity-perp-funding-rates-explained post covers how the daily carry number is derived.

How to harvest it

Three concrete strategies traders use, in increasing order of complexity:

1. Funding-only directional bias.

You have no strong view. You check the funding rate on the symbols you're comfortable trading. On any symbol where funding has been consistently paying one side for the past few days, you take a position on the paid-to-hold side at a reasonable size, with a reasonable stop that reflects the volatility of the underlying. You hold until funding flips or your stop hits.

This is not a free-money trade. If BTC spikes 8% while you're short collecting funding, your funding income is dwarfed by your P&L loss. But in sideways markets, which happen more often than directional markets, this works more often than it fails, especially on crypto where 8-hour funding compounds quickly.

2. Delta-neutral funding harvest.

More advanced. You short the perp on JTX and buy the equivalent spot exposure on a spot venue (if available). Your directional P&L is near-zero because you're hedged; your funding income is positive if the perp funding is positive. You've isolated the funding payment from the directional risk.

This requires capital on two venues, management of basis risk between your short perp and your long spot, and attention to execution fees that can eat the funding income on small positions. On a $200K+ book with +0.05% average 8h funding (not uncommon on crypto in a bull trend), the annualised return is around 55% before costs — enough to be worth the operational overhead.

3. Cross-asset funding comparison.

Instead of picking one symbol, you compare the funding rate across every tradable instrument and allocate to the top few by paid-to-hold yield. This treats funding as an income stream to be optimised rather than a feature of any individual trade.

The downside is correlation: if the top five funding yields are all on crypto perps during a crypto bull run, you're not actually diversified, you're concentrated with extra steps. Mitigate by capping per-asset-class allocation.

What to watch out for

Funding carry is not risk-free, and the traders who get hurt are the ones who treat it as if it were.

• Direction can wipe the yield in minutes. A +0.05% 8-hour funding is 0.15% a day. A single 2% adverse move on the underlying costs 13 days of funding. Your position sizing has to reflect your actual risk, not your theoretical funding income.
• Funding can flip quickly. The rate is computed from recent premium data. A sentiment shift can flip the sign within hours. Set alerts if you're carrying positions specifically for funding, and be ready to flatten if the carry inverts.
• Weekend / overnight exposure. On weekend index positions, you're exposed to a 60-hour window where the European cash markets are closed. Funding mechanics still apply (daily carry settles over the weekend), but your ability to react to news is limited.
• Taxation. Funding payments are typically treated as income in most jurisdictions, with different implications than capital gains on the position's P&L. This is not tax advice; it's a flag to talk to someone qualified before scaling a funding-carry strategy.

Summary

Funding is the mechanism that keeps a perpetual honest without an expiry. For the trader on the paid-to-hold side, it's a persistent small income stream. For the trader fighting the funding, it's a cost that compounds against them. The sign conventions differ by asset class — the funding rates tool is the easiest way to check which side is being paid at any given moment.

A funding-aware trader doesn't necessarily take funding-only trades. But they always know which side of a position they're on, so they can factor the carry in when deciding whether a thin-edge directional trade is actually worth taking. Over a trading year, that factor compounds.

If you want to see current funding rates live across all 293 instruments, the funding dashboard updates continuously. If you're not trading yet, a challenge tier is the lowest-cost way to practise reading funding into trade decisions on a real engine.