What is basis trading? The cash-and-carry arbitrage explained

Basis trading is a market-neutral strategy that profits from the price gap between spot Bitcoin and its futures contracts. It is the reason hedge funds hold billions in Bitcoin ETFs without betting on the price going up.
Summary

• Basis trading, also called cash-and-carry arbitrage, involves buying an asset in the spot market and simultaneously selling a futures contract on the same asset, locking in the price difference as profit regardless of which direction the market moves.
• The strategy became the dominant institutional play in crypto after spot Bitcoin ETFs launched in January 2024, with hedge funds using ETF shares as the spot leg and CME futures as the short leg to capture annualized yields that have ranged from 5% to more than 20%.
• The "basis" is the difference between the futures price and the spot price. In crypto markets, futures almost always trade at a premium to spot because leveraged traders are willing to pay more for exposure without holding the underlying asset. That premium is what basis traders harvest.
• Basis trading is not directional. The trader does not profit from Bitcoin going up or down. The profit comes exclusively from the convergence of the futures price and the spot price as the contract approaches expiration, a mathematical certainty barring exchange default.
• The strategy carries risks including margin calls on the short futures leg during sharp rallies, counterparty risk on the futures exchange, liquidity risk if the ETF shares cannot be sold quickly, and opportunity cost if Bitcoin rallies significantly while the position is locked.

The most widely repeated misunderstanding about Bitcoin ETF inflows is that they represent bullish bets on the price. Many of them do. But a significant share of the billions flowing into spot Bitcoin ETFs comes from hedge funds and trading firms that are completely indifferent to whether Bitcoin goes up or down. They are running basis trades, and the only number they care about is the spread between spot and futures.

This guide explains how the trade works mechanically, why crypto markets offer higher basis yields than traditional commodities, what risks the strategy carries, and how to evaluate whether the current basis is worth capturing. Understanding the basis trade is also essential for interpreting ETF flow data, futures open interest, and funding rate charts, because each of these metrics is heavily influenced by basis trading activity that is often misread as directional conviction.

How the basis trade works step by step

The mechanics are straightforward once the terminology is clear. A basis trade requires two simultaneous positions: a long position in the spot market and a short position in the futures market for the same asset and the same notional amount.

Step one: the trader buys $1 million worth of Bitcoin at the current spot price. In the ETF era, this typically means purchasing shares of a spot Bitcoin ETF such as BlackRock IBIT or Fidelity FBTC, which track Bitcoin's price through direct holdings of the asset. The spot ETF creation and redemption mechanism ensures that ETF shares trade close to the net asset value of the underlying Bitcoin.

Step two: the trader simultaneously sells $1 million worth of Bitcoin futures on a regulated exchange, most commonly the CME. The futures contract will expire on a set date, typically monthly or quarterly.

Step three: the trader holds both positions until the futures contract expires. At expiration, the futures price converges with the spot price by definition, because the contract settles against the actual spot price. The difference between the price at which the futures were sold and the price at which they converge is the trader's profit.

If Bitcoin was trading at $100,000 spot and the one-month futures contract was trading at $101,500, the basis is $1,500 or 1.5% for one month. Annualized, that is approximately 18%. The trader collects that 1.5% regardless of whether Bitcoin finishes the month at $80,000 or $120,000, because the gains on one leg offset the losses on the other.

Why crypto basis is higher than traditional markets

In traditional commodity markets, the basis on oil, gold, or agricultural futures typically runs between 1% and 5% annualized. In crypto markets, the annualized basis has historically ranged from 5% to more than 25%, with spikes above 40% during periods of extreme bullish sentiment. During the bull run of late 2024 and early 2025, the CME Bitcoin front-month basis routinely exceeded 15% annualized, a yield that no comparable fixed-income instrument could match at the time.

The reason is structural. Crypto futures markets are dominated by leveraged speculators who want long exposure without holding the underlying asset. This persistent demand for long futures pushes the futures price above the spot price, creating what traders call contango. The steeper the contango, the wider the basis, and the more profitable the cash-and-carry trade becomes.

Three factors keep crypto basis elevated compared to traditional markets. First, crypto markets trade around the clock every day of the year, which means funding costs and leverage demand never pause. The New York Mercantile Exchange closes on weekends. Binance and Bybit do not. Continuous trading means continuous demand for leverage, which translates to a persistently elevated premium on futures.

Second, the margining requirements on crypto futures are higher than on traditional commodity futures, which means the cost of maintaining leveraged positions is higher, and that cost gets priced into the futures premium. CME Bitcoin futures require initial margin around 40%, compared to roughly 5% to 10% for crude oil or gold. The higher the margin requirement, the more capital a leveraged long must deploy, and the more premium they are willing to accept.

Third, retail participation in crypto futures is proportionally larger than in traditional markets, and retail traders tend to be net long and willing to pay higher premiums for leveraged upside. On offshore exchanges, it is common to see 50x or 100x leverage on Bitcoin perpetual contracts. These highly leveraged longs create enormous demand for the other side of the trade, and the basis is the price the market pays to satisfy that demand.

The perpetual futures funding rate is a related concept. Perpetual contracts do not expire, so there is no natural convergence date. Instead, exchanges use a funding rate mechanism where longs pay shorts (or vice versa) every eight hours to keep the perp price anchored to spot. When funding rates are positive and elevated, it signals the same demand imbalance that drives the basis on dated futures. During sustained bull markets, cumulative funding payments can exceed 30% annualized, making the perp funding trade even more lucrative than the dated futures version.
You might also like: What are perpetual futures? Perps, funding rates, and liquidations explained

The ETF basis trade: how institutions do it

Before spot Bitcoin ETFs launched in January 2024, running a basis trade required holding actual Bitcoin on an exchange or with a custodian. This introduced counterparty risk, custody complexity, and regulatory ambiguity that kept most institutional capital away.

The ETF changed the calculation entirely. A hedge fund can now buy IBIT shares through a prime broker, short CME Bitcoin futures through the same prime broker, and report both positions on a single balance sheet with no direct crypto custody. The trade settles in dollars, clears through regulated infrastructure, and fits within existing risk frameworks.

SEC 13F filings have revealed the scale of this activity. Millennium Management, Citadel, Point72, and dozens of other multi-strategy hedge funds disclosed large IBIT positions alongside corresponding CME futures shorts. These are not Bitcoin bulls. They are arbitrageurs harvesting the basis, and their ETF flow activity creates the paradox of billions in ETF inflows that carry zero directional conviction.

The institutional version of the trade typically targets annualized returns of 8% to 15% with minimal drawdown risk. For a fund that can borrow at 5%, a 12% annualized basis produces 7% of alpha on what is effectively a market-neutral position. At institutional scale, that is an attractive risk-adjusted return.

The scale of institutional basis trading explains a pattern that confuses many retail observers. ETF inflows can surge on a day when Bitcoin's price barely moves, and they can remain strong during periods of sideways trading. This happens because basis traders are responding to futures premium levels, not to price direction. A widening basis attracts more capital into the trade regardless of whether Bitcoin is trending up, down, or sideways. Conversely, when the basis compresses below the cost of capital, institutional ETF flows can dry up even during a rally, because the arbitrage no longer pays.

The perpetual funding rate trade

The dated futures basis trade has a cousin: the perpetual funding rate trade. Instead of buying spot and shorting a dated future, the trader buys spot and shorts a perpetual contract on a crypto exchange such as Binance, Bybit, or Hyperliquid.

The profit mechanism is different. There is no expiration date and no convergence event. Instead, the trader collects funding payments every eight hours when the funding rate is positive. Positive funding means longs are paying shorts, which means the trader holding the short perp leg receives payments continuously.

The advantage of the funding rate trade is flexibility. The trader can enter and exit at any time without waiting for contract expiration. The disadvantage is unpredictability. Funding rates can turn negative during bearish periods, at which point the short leg starts costing money instead of earning it. The trader must monitor rates actively and be prepared to unwind when the trade stops paying.

The funding rate version also carries higher counterparty risk because it typically involves unregulated offshore exchanges. The CME basis trade, by contrast, clears through a regulated clearinghouse, which is why institutional capital overwhelmingly prefers the dated futures version.

A hybrid approach exists for traders who want the flexibility of perpetuals with reduced counterparty risk. Some traders hold their spot leg in a self-custodied wallet or on a regulated exchange and run the short perp leg on a decentralized perpetual exchange such as Hyperliquid or dYdX. The smart contract handles margin and settlement without an intermediary, which removes the centralized exchange failure risk. The tradeoff is that decentralized perp venues sometimes have lower liquidity and wider spreads than their centralized counterparts, which increases execution costs.

The arithmetic: when the trade pays and when it does not

The profitability of a basis trade depends on four numbers: the current basis spread, the cost of capital, the margin requirements, and the holding period.

Consider a concrete example. Bitcoin spot is at $100,000. The three-month CME futures contract trades at $104,000. The annualized basis is approximately 16%. The trader buys $10 million in IBIT shares and shorts $10 million in CME futures.

If the trader's cost of capital is 5% (prime broker financing), the net yield is 11% annualized. Over three months, that produces approximately $275,000 in profit on $10 million of notional, with near-zero directional risk.

But the arithmetic changes if the basis compresses. If Bitcoin enters a bearish period and futures flip to backwardation (futures below spot), there is no basis to capture and the trade produces a loss. Historically, crypto futures have been in contango approximately 85% of the time, which is why the trade has been consistently profitable over multi-year periods.

The arithmetic also changes with margin. CME Bitcoin futures require initial margin of roughly 40% of notional. If Bitcoin rallies sharply, the short futures leg generates unrealized losses that require additional margin. A 20% rally on a $10 million short futures position creates $2 million in margin calls. The trader must have sufficient liquidity to meet those calls without unwinding the position, because unwinding the short leg while keeping the long leg converts a market-neutral trade into a directional long that may then reverse.

This margin dynamic is the single most common cause of basis trade failure. During the rally from $60,000 to $73,000 in March 2024, several smaller funds were forced to close their short futures legs because they could not meet margin calls. Their IBIT positions, no longer hedged, became naked longs at exactly the moment the rally paused and reversed. The trade that was designed to be market neutral became a directional loss because the fund did not hold enough reserve capital to survive the short-term drawdown on the short leg.

Roll cost is another factor that reduces realized returns. When a dated futures contract approaches expiration, the trader must close the expiring short and open a new short in the next contract month. This roll carries transaction costs, including commissions, the bid-ask spread on both the closing and opening legs, and potential slippage if the roll happens during a volatile session. For quarterly rolls on CME Bitcoin futures, these costs typically consume 0.1% to 0.3% of notional per roll, which can reduce the annualized yield by one to two percentage points.
Read more: Crypto arbitrage trading: a guide to making low-risk crypto trading returns

What this does not cover

This guide does not cover crypto arbitrage strategies beyond the cash-and-carry trade, such as triangular arbitrage, cross-exchange arbitrage, or statistical arbitrage. It does not cover options-based strategies that use the basis as an input, such as calendar spreads or volatility arbitrage. It does not cover the tax treatment of basis trades, which varies significantly by jurisdiction and depends on whether the spot leg is held as a security (ETF shares) or as property (direct cryptocurrency). It does not explain how to execute the trade on specific platforms, because execution details vary by exchange and broker and change frequently.

Practical checks before entering a basis trade

Check the current annualized basis. Platforms such as Coinglass, Laevitas, and The Block publish real-time annualized basis for CME and major exchange futures. If the annualized basis is below your cost of capital, the trade does not pay.

Check open interest on the contract you plan to short. Low open interest means the contract is illiquid, which widens the bid-ask spread and increases the cost of entry and exit. CME Bitcoin front-month contracts typically have sufficient liquidity for institutional-sized trades. Back-month contracts may not.

Check your margin buffer. Calculate the maximum drawdown your short leg can sustain before triggering a margin call. A common rule of thumb is to hold enough reserve capital to absorb a 30% to 40% rally without needing to unwind. If you cannot meet margin calls in a rally, the trade can turn from market-neutral to forced liquidation.

Check the funding rate if using perpetual contracts. Look at the 30-day average funding rate, not the current snapshot. A single elevated snapshot can be an anomaly. The 30-day average tells you whether the trade is structurally paying.

Check counterparty risk. On CME, your counterparty risk is the clearinghouse. On an offshore exchange, your counterparty risk is the exchange itself. If the exchange goes down, your short leg disappears and you are left with a naked long position in a potentially falling market.

Is basis trading risk free? {#faq-question-1}

No. Basis trading is often described as low risk, not zero risk. The primary risks are margin calls on the short leg during sharp rallies, counterparty default on the futures exchange, liquidity risk if positions cannot be unwound at expected prices, and the possibility that the basis turns negative during bearish periods. The "risk free" label comes from the mathematical certainty that futures converge to spot at expiration, but the path between entry and expiration can involve significant mark-to-market losses on one leg that must be financed.

How much capital do I need to start a basis trade? {#faq-question-2}

The minimum depends on the venue. CME Bitcoin futures have a contract size of five Bitcoin (approximately $500,000 at $100,000 per coin), which makes the standard contract unsuitable for retail traders. CME Micro Bitcoin futures (one-tenth of one Bitcoin) have lower notional requirements. On crypto-native exchanges, perpetual contracts can be opened with as little as a few hundred dollars, though the counterparty risk is correspondingly higher.

Why do hedge funds buy Bitcoin ETFs if they are not bullish? {#faq-question-3}

Because the ETF is the cheapest and most operationally simple way to hold the spot leg of a basis trade. The hedge fund profits from the spread between the ETF price and the futures price, not from Bitcoin appreciation. The ETF position is fully hedged by the short futures position.

What happens to the basis trade when Bitcoin crashes? {#faq-question-4}

The spot leg loses value, but the short futures leg gains an approximately equal amount. The net profit or loss is determined by the basis, not by the direction of Bitcoin. However, if the crash is severe enough to push futures into backwardation, the basis turns negative and the trade loses money until contango resumes.

Can I run a basis trade with Ethereum or other cryptocurrencies? {#faq-question-5}

Yes. Basis trades can be executed on any asset with liquid spot and futures markets. Ethereum has an active basis on CME futures, and the launch of spot Ethereum ETFs created the same institutional playbook that IBIT enabled for Bitcoin. Solana, XRP, and other major cryptocurrencies have basis on offshore exchanges, though liquidity is lower and counterparty risk is higher. The general rule is that the more liquid the spot and futures markets, the tighter the execution costs and the more reliable the basis capture.

What is the difference between basis trading and funding rate farming? {#faq-question-6}

Basis trading uses dated futures that expire on a set date, and the profit comes from the convergence of futures to spot at expiration. Funding rate farming uses perpetual contracts that never expire, and the profit comes from collecting funding payments every eight hours. The economic logic is similar, but the risk profiles differ because perpetual funding rates can fluctuate rapidly.

How do I calculate the annualized basis? {#faq-question-7}

Take the futures premium as a percentage of the spot price, then multiply by (365 divided by the number of days until expiration). If spot is $100,000, futures are $102,000, and the contract expires in 60 days, the premium is 2% and the annualized basis is 2% multiplied by (365/60), which equals approximately 12.2%.

Does basis trading affect Bitcoin's price? {#faq-question-8}

Not directly, because basis trades are market neutral. The spot buying and futures selling roughly offset each other in terms of price impact. However, large-scale basis trading can increase liquidity in both spot and futures markets, which can reduce volatility. The ETF inflows driven by basis traders also increase the total assets under management of Bitcoin ETFs, which some analysts interpret as a demand signal even though the underlying motivation is arbitrage. The unwinding of basis trades can have a more noticeable effect. If basis traders close their positions in bulk during a period of low liquidity, the simultaneous selling of ETF shares and buying back of futures can create short-term price dislocations.

Disclaimer

This article is for informational purposes only and does not constitute financial, investment, or trading advice. Basis trading involves risks including margin calls, counterparty default, and potential loss of capital. Past performance of basis spreads does not guarantee future results. Always conduct your own research and consult a qualified financial advisor before making investment decisions. Information accurate as of August 6, 2026.