Most people come to crypto trying to guess which way the market will move next. Funding rate arbitrage takes the opposite approach. Instead of betting on the price of Bitcoin going up or down, the strategy aims to earn a steady return regardless of direction by exploiting a small, recurring payment that exists in the derivatives market: the funding rate.
This kind of trade is often called a cash-and-carry trade, and it is one of the oldest ideas in finance, adapted for the crypto era. It is widely used by trading desks, market makers, and sophisticated individuals who want yield without taking a directional view on price. This article explains, in plain language, where funding rates come from, how the cash-and-carry trade captures them, what returns look like in practice, and the risks that rarely make it into the headlines.
What Are Funding Rates?
To understand funding rates, you first need to understand the instrument they belong to: the perpetual future, often shortened to “perp.”
A traditional futures contract has an expiry date. A perpetual future does not. It is designed to be held indefinitely, which makes it convenient for traders but creates a problem: with no expiry to force the contract price back in line with the real (spot) price of the asset, the two could drift apart. The funding rate is the mechanism that keeps them tethered.
Why Perpetual Futures Need Funding
The funding rate is a small payment exchanged directly between traders who are long (betting the price will rise) and traders who are short (betting it will fall). It is usually settled every eight hours, although some venues now use shorter intervals. Crucially, the exchange does not take this money; it simply moves it from one side of the market to the other.
The size and direction of the payment depend on how far the perpetual’s price has drifted from the spot price. When demand to go long is high, the perpetual tends to trade slightly above spot, and the funding rate becomes positive. When fear dominates and traders pile into shorts, the perpetual trades below spot and funding turns negative. In this way, funding acts like a thermostat, gently penalising the crowded side of the trade and nudging the perpetual price back toward spot.
Positive vs. Negative Funding
The distinction matters enormously for arbitrage:
When funding is positive, longs pay shorts. This is the most common situation in a rising or optimistic market, because more people want leveraged exposure to the upside. If you are short the perpetual during this period, you receive the funding payment.
When funding is negative, shorts pay longs. This tends to happen during sharp sell-offs or periods of extreme bearishness. If you are long the perpetual, you receive the payment instead.
The cash-and-carry trade is built around capturing these payments while neutralising the risk of the price itself moving.
The Cash-and-Carry Trade Explained
The genius of the cash-and-carry trade is that it removes price risk almost entirely. You are not hoping Bitcoin rises. You are not hoping it falls. You simply want to collect the funding payments while your overall exposure to price stays flat.
The Two Legs of the Trade
The trade has two parts that are opened at the same time and in equal size.
The first leg is the “cash” side: you buy the underlying asset on the spot market. For example, you buy one Bitcoin and actually hold it. The second leg is the “carry” side: you open a short position of the same size on the perpetual future. You are now simultaneously holding one Bitcoin and shorting one Bitcoin’s worth of the perpetual.
Because the most common environment is positive funding, the short leg earns you the funding payment every eight hours. That stream of payments is your yield.
Why It Is Market-Neutral
The reason this works is that the two legs cancel each other out when the price moves. Traders call this being delta-neutral, meaning your net exposure to the price is close to zero.
Suppose you buy one Bitcoin at $60,000 and short one Bitcoin’s worth of the perpetual at the same price. If Bitcoin then climbs to $70,000, your spot holding gains $10,000, but your short position loses $10,000. The two offset. If Bitcoin instead falls to $50,000, your spot holding loses $10,000 while your short gains $10,000. Again, they offset. In either case, the price movement washes out, and what you are left with is the funding you collected along the way.
This is the heart of the strategy: the profit does not come from being right about direction. It comes from the structural payment built into perpetual futures.
A Step-by-Step Example
It helps to put real numbers on it. Imagine you buy one Bitcoin on the spot market for $60,000 and short an equal amount on the perpetual. Assume the funding rate is a fairly typical positive figure of 0.01% per eight-hour period.
Each funding interval, you receive 0.01% of the position’s value. On a $60,000 position, that is six dollars. Funding settles three times a day, so you collect roughly eighteen dollars daily. Over a full year, assuming the rate held steady, that comes to about $6,570, which works out to an annualised return of just under 11% on the position size.
The price of Bitcoin could double or halve during that year, and your net position would barely move, because the spot and short legs cancel. You would simply keep accumulating funding payments. That combination of a meaningful yield and minimal price exposure is exactly why the trade is so popular among professionals.
How to Calculate Your Real Yield
The headline number can be misleading if you are not careful, so it is worth understanding what the percentage actually refers to.
Funding rates are quoted per interval, not per year, so you have to annualise them to see the true picture. With three settlements per day across 365 days, a single year contains 1,095 funding periods. A rate of 0.01% per period therefore implies an annualised yield of roughly 11%, before costs. A higher rate of 0.05% per period would imply something closer to 55% annualised, which is why funding arbitrage attracts so much attention during euphoric markets.
Two adjustments keep your expectations realistic. First, funding rates are not fixed; they fluctuate constantly and can fall toward zero or turn negative, so the annualised figure is an estimate, not a promise. Second, the percentage is calculated on the position’s notional value, while your actual return on invested capital depends on how much collateral you have tied up across both legs and on the fees you pay to maintain the trade.
The Risks Nobody Mentions
Funding rate arbitrage is frequently described as “risk-free,” which is simply not true. It is market-neutral, which is a different thing. Understanding where the danger lies is what separates a durable strategy from an expensive lesson.
Funding Can Flip Negative
The entire trade assumes you are being paid to hold your short. But funding is not guaranteed to stay positive. In a sharp downturn, the rate can turn negative, at which point your short position starts paying out instead of receiving. A trade that was earning yield quietly becomes one that costs you money every eight hours until conditions change or you close it.
Liquidation Risk on the Short Leg
Your short position requires margin, and a violent upward move in price can push that position toward liquidation if it is not adequately collateralised. Even though your spot holding is rising in value at the same time, the two are often held in separate places, and the gain on your spot may not automatically rescue the margin on your short. Managing collateral carefully, and keeping a healthy buffer, is essential.
Exchange and Counterparty Risk
To run this trade you must keep assets and collateral on an exchange. The collapse of several large platforms in recent years is a stark reminder that funds held on a venue are exposed to that venue’s solvency and security. No funding yield compensates for losing the underlying capital.
Fees and Execution
The margins on this strategy are often thin, which means trading fees, slippage, and the cost of moving collateral between accounts can erode a meaningful slice of your return. A rate that looks attractive on paper can shrink considerably once real-world costs are subtracted.
Funding Arbitrage vs. the Dated-Futures Basis Trade
The perpetual version described above is the most common form of cash-and-carry in crypto, but there is a closely related trade using dated futures that have a fixed expiry.
When a quarterly futures contract trades at a premium to spot, a situation known as contango, you can buy the asset on spot and short the dated future against it. As expiry approaches, the futures price and the spot price must converge, and that gap, called the basis, becomes your locked-in profit. Unlike the perpetual trade, you do not depend on funding staying positive; the return is effectively fixed at the moment you open the position, assuming you hold it to expiry. This is the purest expression of the classic cash-and-carry trade, carried over almost unchanged from traditional commodity and bond markets.
Is Funding Rate Arbitrage Worth It?
For the right person, the appeal is obvious: a yield-generating strategy that does not require predicting the market and that performs similarly whether prices rise or fall. During bullish periods, when leverage demand pushes funding rates high, the returns can comfortably exceed what traditional fixed-income products offer.
That said, it is not passive income in the casual sense. It demands capital on both legs, ongoing monitoring of funding and collateral, discipline around exchange risk, and a clear-eyed view of fees. The word “arbitrage” tends to imply something effortless and guaranteed, but in crypto it is better understood as a disciplined, market-neutral yield strategy with real operational risks attached.
Understood properly, the cash-and-carry trade is one of the most elegant ideas in the market: a way to turn the plumbing of perpetual futures into a steady return. Understood carelessly, it can be a fast way to learn why “market-neutral” and “risk-free” are not the same words.
This article is for educational purposes only and does not constitute financial or investment advice. Cryptocurrency trading carries significant risk, and you should do your own research or consult a licensed professional before making any decisions.
