The funding-arbitrage trade
Understand how sophisticated traders use the funding mechanism itself as a yield source — and why it's not a fit for most retail.
Lesson path
Crypto and DeFi
Spot vs Perpetual Futures
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Understand how sophisticated traders use the funding mechanism itself as a yield source — and why it's not a fit for most retail.
How to earn funding without taking directional risk
The funding-arbitrage trade — also called the cash-and-carry — is what sophisticated traders do when funding stays very positive. The structure is simple to describe: short an amount of the perp, and at the same time buy that same amount in spot. Now your directional exposure is roughly zero. If Bitcoin goes up, your spot gains roughly offset your perp losses. If it goes down, your perp gains roughly offset your spot losses. What's left over is the funding payment you collect every cycle for being on the short side of a positive-funding market.
Run a quick example. Funding is sitting at +0.05% per 8h. You short $10,000 of BTC perp and buy $10,000 of spot BTC. Your price exposure is roughly neutral. Every 8 hours, you receive about $5 in funding from longs. Three cycles per day means $15 daily, or about $450 per month. On $20,000 of total capital deployed, that's about 27% annualized — for taking very little directional risk.
The risks are real. First, funding can flip negative without warning, turning your yield into a cost. Second, your spot and your perp don't track each other perfectly — there's basis risk, which can hurt during fast moves. Third, you have counterparty risk — the spot exchange or perp exchange could freeze withdrawals or fail. Fourth, you're tying up capital that could be doing something else. Fifth, fees and slippage on entry and exit eat into the math.
Why do we cover it as a lesson at all? Because understanding the mechanism is what makes you fluent in perp markets, even if you never put on the trade yourself. When you see funding compress fast or stay stubbornly high, it's often because arbitrage traders are entering or exiting at scale. Knowing the structure helps you read what positioning data actually means. For most retail readers, the takeaway is awareness, not execution: this is what real desks are doing when funding gets loud, and it's why extreme funding rarely lasts long.
Recap: short perp + long spot earns funding when it's positive. Real but capital-heavy, with real risks. Mostly relevant for retail as awareness — it explains why extreme funding compresses.
Knowledge check
Answer before moving on.
1. What is the basic structure of the funding-arbitrage trade when funding is positive?
2. What is the biggest risk to a positive-funding arbitrage trade?
3. Why is funding arbitrage typically not a fit for retail traders with small capital?
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