The crypto basis trade explained: how funds earn the gap between spot ETFs and futures

Who this is for: Fund managers, treasurers, analysts and serious investors who want to understand what the basis trade is, who runs it, how to read it in CFTC and exchange data, and how to size, cost and stress-test a cash-and-carry position before treating an ETF flow headline as a signal of real demand.

Every few months a headline announces record spot bitcoin ETF inflows, and a day later another asks why the price did not move. The answer is often the basis trade. Since US spot bitcoin ETFs launched in January 2024, a meaningful fraction of the money flowing into them has been one leg of a hedged position: long the ETF, short a CME futures contract of the same size, with the manager indifferent to where bitcoin goes and interested only in the spread between the two prices.

That spread, the basis, is a quiet engine of crypto market structure. When it is wide, hedge funds pile in, CME open interest rises and ETF creations surge. When it compresses, the same funds unwind, and the unwind looks exactly like a bear market in the flow data even though nobody changed their view of bitcoin. The Block reported on April 9, 2026 that CME bitcoin futures open interest had fallen to $7.2 billion, its lowest since February 2024, with the basis near 5% against a roughly 4.5% risk-free rate; a Two Prime executive quoted by DL News on April 20, 2026 called it a basis unwind masquerading as a bear market.

This guide covers the mechanics, the CME and offshore versions, who runs the trade, how to read the positioning data, how the basis moved from 2024 through 2026, and a worked example of a fund deploying $50 million.

The crypto basis trade by the numbers

What the basis is and why it exists

The basis is the difference between a futures price and the spot price of the asset it references. Futures above spot is contango, a positive basis; futures below spot is backwardation, a negative basis. For a dated contract the basis shrinks to zero at expiry because the contract settles to a spot reference. CME bitcoin futures cash-settle to the CME CF Bitcoin Reference Rate, the same benchmark family many spot ETFs use for net asset value, which is why the ETF-versus-CME pairing tracks so cleanly.

In theory the basis should equal the cost of carry: the interest forgone by holding the asset, less any yield it pays. Bitcoin pays none, so its annualised basis should sit near short-term rates, about 4% to 5% in 2025 and 2026. In practice crypto futures have traded far richer for long stretches. CF Benchmarks recorded the CME basis approaching 25% annualised in February 2024 and exceeding 20% in November 2024, and CME’s OpenMarkets piece of November 5, 2025 noted SOL and XRP bases spiking to 50% annualised in July 2025.

The premium persists because the natural buyers of crypto futures are leveraged speculators who want long exposure without holding coins, while the sellers are a smaller pool of arbitrageurs who must tie up capital, post margin and carry counterparty risk. The premium is the price of leverage; the basis trade collects it.

Basis versus funding

Offshore, most volume is in perpetual swaps, which never expire. Instead of convergence, a funding payment settled roughly every eight hours flows from longs to shorts when the perp trades above spot, and the reverse when below. An 8.4% annualised funding rate means a short collects about 8.4% a year in eight-hour slices while the rate stays positive. Our guide on perpetual futures, funding rates and liquidations covers the mechanics; the key difference is that funding can flip sign in hours, whereas a dated future locks the basis in on day one.

How cash-and-carry works, leg by leg

1. Buy spot. The fund buys bitcoin, or shares in a spot ETF such as IBIT or FBTC. ETFs became the preferred spot leg for US funds after January 2024 because they sit in an ordinary prime brokerage account, can be financed like any equity, and sidestep the questions in our custody guide. The cost is a management fee of roughly 20 to 50 basis points a year.
2. Sell futures of equal size. One standard CME bitcoin contract is 5 BTC; micro contracts of 0.1 BTC allow fine-tuning. The fund sells enough contracts to match the spot position, picking the maturity whose basis offers the best annualised return for the holding period.
3. Post margin. The clearing member requires initial margin on the short, a large fraction of notional given bitcoin’s volatility. Treasury bills are acceptable collateral at CME, so margin keeps earning a cash yield, but it still ties up balance sheet.
4. Earn the basis. As expiry approaches the futures price converges on spot. Directional gains and losses on the two legs cancel, leaving the original basis as profit.
5. Roll or unwind. Before expiry the fund either closes both legs or rolls the short into the next contract. The roll re-prices the trade: a rich next-month premium locks in another quarter of carry; a collapsed or negative premium means selling the ETF, buying back the futures and going home.

What the fund is really earning

The headline basis is gross. Against it sit ETF fees, commissions, financing on any borrowed portion of the spot leg and the opportunity cost of margin. CF Benchmarks’ October 2025 analysis worked a $100 million example at a 10% basis, 5.3% SOFR and 7.3% borrowing cost and arrived at a 9.43% annualised return on equity. The hurdle is the T-bill yield plus the fund’s cost of capital and a risk premium, so a 5% basis against a 4.5% risk-free rate, as The Block described in April 2026, is a trade with an expected excess return under 1%.

Who runs the trade and on which venues

Hedge funds on CME

Multi-strategy and macro funds run the regulated version, long ETF and short CME, and appear in the CFTC’s Commitments of Traders report as “Leveraged Funds”; quarterly 13F filings name them. Blockworks reported on April 28, 2025 that hedge funds held about 37% of spot bitcoin ETP assets per Q1 2025 filings, and Hedgeweek put Brevan Howard’s IBIT stake at 37.9 million shares, about $2.6 billion, in June 2025. CF Benchmarks’ February 19, 2026 analysis tracked the retreat: aggregate hedge fund IBIT holdings fell from 114 million shares in Q3 2025 to 82 million in Q4 2025, with Brevan Howard down 85% to 5.5 million shares and Farallon down 70%. These were not bitcoin bears; they were carry traders whose carry went away.

Market makers and authorised participants

Firms such as Jane Street, which Hedgeweek reported holding $1.46 billion of IBIT in mid-2025, sit inside ETF creation and redemption. An authorised participant hedges the bitcoin it must deliver with futures or perps until settlement, and may hold the hedged inventory for carry when the basis is attractive. The ETF plumbing and the futures market are one machine seen from two sides.

Crypto-native funds and protocols on perps

Offshore, the trade runs against perpetuals on Binance, OKX, Bybit, Deribit and Hyperliquid. The most institutionalised version is Ethena’s USDe, a synthetic dollar backed by spot crypto hedged with short perps, whose yield is the funding rate. CCS reported USDe supply peaking at $14.8 billion on October 4, 2025 and near $4.9 billion of crypto-backed supply on September 25, 2026, when Ethena added a tokenised-equity basis trade on Binance that had averaged about 11% annualised over six months before compressing toward 7%. Not every large spot holder hedges: bitcoin treasury companies such as Strategy are outright long, and DL News noted Strategy buying 24,761 BTC between April 6 and 13, 2026 while hedged funds were selling into a falling basis.

Reading the trade in CFTC and exchange data

The CFTC’s Commitments of Traders report, published each Friday for positions as of the prior Tuesday, splits CME open interest into Dealers, Asset Managers, Leveraged Funds, Other Reportables and Non-reportables. The September 29, 2026 report, as compiled by Tradingster, showed bitcoin futures open interest of 19,596 contracts. Leveraged Funds were long 4,980 and short 11,836; Asset Managers were long 5,069 and short 1,483; Dealers were long 6,892 and short 4,212. The leveraged fund net short of roughly 6,850 contracts, about 34,000 BTC, is the visible futures leg of the ETF basis trade. TFTC’s read of the September 8, 2026 data made the same point: gross longs and gross shorts expanded together, the signature of hedging rather than a bearish bet.

• Leveraged fund shorts are not sentiment. The “record hedge fund short” headlines of November 2024, when CME open interest hit a record near 45,000 contracts per CF Benchmarks, coincided with a basis above 20%. The record short was a record carry trade.
• Open interest follows the basis with a lag. CF Benchmarks tracked CME open interest from about 30,000 contracts in January 2024 to the November 2024 record and back to the low 30,000s by May 2025 after the basis fell below 10%; The Block recorded five straight monthly declines into the April 2026 low.
• Compare CME with offshore. CoinDesk reported on December 22, 2025 that Binance’s bitcoin futures open interest (about 125,000 BTC) had overtaken CME’s (about 123,000 BTC, down from 175,000 at the start of 2025) for the first time since November 2023. Regulated OI falling while offshore OI rises means carry capital is migrating to the cheaper, riskier venue or leaving.
• Watch the 13Fs. They lag 45 days but name holders. Q2 2026 filings reported by The Block on August 15, 2026 showed Harvard at 3,044,612 IBIT shares after a 43% cut in Q1 2026, Mubadala at 14.7 million and JPMorgan up to 10.4 million. Rising bank and adviser holdings alongside falling hedge fund holdings describe an ETF base shifting from hedged to unhedged.

CCS tracks flows daily on the ETF tracker and follows COT data across assets, for example the September 23, 2026 report on CME leveraged funds cutting 46.3 million XRP of shorts in a week.

How the basis moved from 2024 to 2026

2024, the boom. The ETF launch gave US funds a clean spot leg and the basis approached 25% annualised in February 2024 per CF Benchmarks. CME open interest rose from about 30,000 contracts to a record near 45,000 by late November 2024, when the basis again exceeded 20%. CF Benchmarks’ February 2026 retrospective described carry that regularly touched 15% to 20%.

2025, compression and reload. Carry trades eat their own returns. CF Benchmarks recorded the basis briefly below zero in March 2025 and under 10% in April 2025, and sFOX documented about $2.7 billion of IBIT outflows over six weeks attributed to arbitrage capital exiting. Then the trade reloaded: Blockworks recorded $3.4 billion of weekly inflows in the week of April 21 to 25, 2025, with Bloomberg Intelligence suggesting basis activity had resumed while Bitwise argued the money was long-term. By mid-year the trade was multi-asset: CF Benchmarks tracked CME ether leveraged fund net shorts growing from about 6,000 to 19,200 contracts between April and August 2025 against roughly $11.2 billion of spot ether ETP inflows.

October 2025, the deleveraging. FTI Consulting documented perp funding climbing from about 10% annualised to nearly 30% by October 6, 2025. On October 10, after a tariff shock, more than $19 billion of leveraged positions were liquidated in roughly a day across about 1.6 million accounts. The Defiant recorded Hyperliquid open interest falling from $14.7 billion to $6.5 billion, with auto-deleveraging forcibly closing profitable shorts. On Binance, USDe traded in the mid-$0.60s for about 40 minutes against $0.99 on Curve and Uniswap because the exchange marked collateral off its own thin order book; Binance later paid $283 million in compensation. 21Shares recorded nearly 90% of liquidations as longs and funding flipping sharply negative. Each failure hit basis traders directly: ADL removed hedges, collateral was mispriced, and funding briefly paid the wrong way.

Late 2025 to spring 2026, the unwind. CoinDesk put the CME basis near 5% in December 2025, down from a roughly 15% peak. Bitcoin fell from about $126,000 in October 2025 to about $67,000 by February 2026 per CF Benchmarks, and hedge funds cut IBIT holdings 28% in Q4 2025. The Block reported CME monthly volume of $163 billion in March 2026, down nearly 50% from the January 2025 peak, and open interest of $7.2 billion in early April. Crypto Briefing noted about $4.5 billion of spot ETF redemptions in June 2026 and year-to-date flows still $1 billion negative in early September.

Mid-2026, the rebuild. CME launched 24/7 crypto futures and options trading on May 29, 2026, after $3 trillion of notional crypto volume in 2025. Spot ETFs drew $3.52 billion in August 2026 and $3.8 billion in the three weeks to September 5, lifting assets to $101.3 billion. Hyperliquid open interest was back to $14.3 billion on September 8, 2026. Bitcoin rallied more than 40% in Q3 2026 to about $87,000 per CoinDesk, and on October 6, 2026 DefiRate’s weighted perp funding read +8.4% annualised against a 30-day average of 5.2%. The carry is back, though not at 2024 levels.

Why many ETF inflows are hedged, and why it matters

When a hedge fund creates $100 million of IBIT and sells $100 million of CME futures, the ETF reports $100 million of inflows and the fund’s net bitcoin exposure is zero. The ETF’s bitcoin is real and leaves the market, but the futures supply equivalent synthetic exposure to someone else; the price effect is close to nothing, the effect on flow statistics is large.

Three consequences follow. Inflow headlines overstate demand when the basis is wide, and outflow headlines overstate capitulation when it compresses. Flows and CME positioning should be read together: inflows with a jump in leveraged shorts is a carry week, inflows with flat shorts is more likely directional. And the hedged share is falling: CF Benchmarks recorded IBIT advisory positions growing 145% from 38 million shares in Q4 2024 to 93 million in Q4 2025 while hedge funds cut. Money that will not leave when the basis compresses is a different kind of money.

How we got here: a timeline

Worked example: a $50 million BTC basis trade

How to evaluate a basis trade: a checklist

• What is the basis net of the cash rate? A 5% basis against 4.5% T-bills is a 0.5% trade before costs. Compute the excess, not the headline.
• Dated future or perp? A CME contract locks carry to expiry; a perp pays whatever funding turns out to be. October 2025 showed the difference is not academic.
• Who holds the collateral? CME Clearing with T-bills, an offshore exchange holding stablecoins and a protocol vault with an ADL rule are three different risks. Price each.
• Can the fund meet a 20% variation margin call in cash overnight? Spot gains are not at the FCM. Without a liquidity line the trade is a forced seller in a rally.
• What is the roll plan? Decide in advance the basis at which the position is unwound rather than rolled, and what that does to reported ETF flows.
• What does the COT say about crowding? Leveraged fund shorts above 60% of open interest, as on September 29, 2026, mean many participants will react to the same compression at once.
• How are reference prices set under stress? Binance marked USDe collateral off its own thin order book on October 10, 2025 and paid $283 million for the error.

Risks and open questions

The basis trade is often called risk-free, and it is not. Direction is hedged; little else is. Margin risk is the most common failure: the short is marked to market daily in cash while the long’s gains are unrealised, so a sharp rally can force a liquidity-constrained fund out of a position that is making money on paper. Counterparty risk dominates offshore, where the exchange is clearing house, custodian and price oracle at once and where auto-deleveraging can close a hedge without consent, as on Hyperliquid on October 10, 2025. Funding risk applies to the perp version, where carry can go negative for weeks and a protocol like Ethena must draw on a reserve fund to keep paying.

The systemic questions are open. The trade links regulated ETF flows, CME positioning and offshore leverage into one loop, so stress travels between them within hours; the October 2025 event moved from Binance collateral marks to Hyperliquid ADL to ETF redemptions in weeks. Regulators have not said how they view hedged ETF holdings, and the SEC and CFTC split puts the two legs under different agencies with different data. How durable the mid-2026 rebuild is remains unclear: funding at 8.4% on October 6, 2026 against a 30-day average of 5.2% suggests quick re-levering, and each cycle so far has drawn more capital at a lower basis.

What to watch next

Glossary

Basis

The difference between a futures price and the spot price of the underlying, usually quoted as an annualised percentage of spot.

Cash-and-carry

Buying the spot asset and selling futures against it to earn a positive basis with no net directional exposure.

Contango and backwardation

Contango is futures above spot (positive basis); backwardation is futures below spot (negative basis).

Funding rate

The periodic payment between longs and shorts in a perpetual swap that keeps its price near spot; positive funding means longs pay shorts.

Perpetual swap

A futures-like contract with no expiry, anchored to spot by funding rather than by convergence at maturity.

Commitments of Traders (COT)

The CFTC’s weekly report splitting futures open interest into trader categories such as Leveraged Funds and Asset Managers.

Leveraged Funds

The COT category covering hedge funds and CTAs; their short CME crypto positions are largely the futures leg of basis trades.

Variation margin

Daily cash settlement of futures gains and losses; a short must pay out in cash when the price rises.

Roll

Closing an expiring contract and opening the next; the moment a carry trade is re-priced at the new basis.

Auto-deleveraging (ADL)

An exchange mechanism that forcibly closes profitable positions to cover bankrupt ones when the insurance fund runs short.

CME CF Bitcoin Reference Rate (BRR)

The daily benchmark to which CME bitcoin futures cash-settle and which many spot ETFs use for NAV.

Why it matters

The basis trade is the hinge between the regulated ETF-and-CME world, where pensions and advisers now hold bitcoin, and the offshore perpetuals world where most leverage lives. Carry traders move capital between them, transmit stress from one to the other, set the premium at which leveraged longs are supplied, and generate much of the ETF flow data the market treats as a demand signal. Anyone reading inflows as conviction, or hedge fund shorts as bearishness, is reading the trade’s footprints without knowing what left them.

The record of 2024 to 2026 is a full cycle: a 25% basis that drew in tens of billions, a compression toward cash rates that pushed much of it out, a leverage event in October 2025, and a 2026 rebuild at thinner margins on more mature infrastructure. The useful question is not whether the trade is good or bad but how much of what you see in the data is really it. CCS covers the reporting and interviews behind this guide in the interview archive and on the research hub.

Sources

1. CFTC Commitments of Traders via Tradingster: Bitcoin, CME (positions as of Sep 29, 2026), October 2, 2026
2. CME Group OpenMarkets: Spot ETFs Give Rise to Crypto Basis Trading, November 5, 2025
3. Crowdfund Insider: CME Group to Roll Out 24/7 Cryptocurrency Futures and Options Trading Starting May 29, May 2026
4. CF Benchmarks: Revisiting the Bitcoin Basis, October 16, 2025
5. CF Benchmarks: Tracking Bitcoin’s Flows, February 19, 2026
6. The Block: CME Bitcoin futures activity slumps to 14-month low as basis trade unwind drains institutional demand, April 9, 2026
7. The Block: Harvard leaves bitcoin ETF stake untouched in Q2, August 15, 2026
8. The Block: Hyperliquid open interest climbs to $14.3 billion, September 8, 2026
9. CoinDesk via Yahoo Finance: CME loses top spot to Binance in bitcoin futures open interest, December 22, 2025
10. CoinDesk: Bitcoin is about to get a major bullish signal it hasn’t had in over a year, October 5, 2026
11. FTI Consulting: The Crypto Crash of October 2025: When Leverage Met Liquidity, 2026
12. The Defiant: The Ultimate 10/10 Crash Autopsy, October 2025
13. 21Shares Research: Record crypto liquidations amid tariff shock, October 2025
14. Decrypt: Binance Reimburses $283M After Market Crash and Asset Depegging Issues, October 13, 2025
15. Blockworks: ‘Basis trade’ or HODLers: What’s behind the crypto ETF inflow spike?, April 28, 2025
16. Hedgeweek: Brevan Howard ramps up bitcoin exposure amid institutional buying spree, August 2025
17. sFOX: Bitcoin ETFs Face First Stress Test as Arbitrage Capital Exits, 2025
18. DL News: ‘Basis traders’ are done dragging down Bitcoin price, says investment adviser, April 20, 2026
19. Crypto Briefing: Bitcoin ETFs remain $1B short of breaking even in 2026, September 8, 2026
20. LCX: Bitcoin ETF inflows hit $3.8B in strongest three-week stretch of 2026, September 5, 2026
21. TFTC: Bitcoin futures leveraged funds short, CFTC data and the basis trade, September 14, 2026
22. DefiRate: Bitcoin perpetual funding rate snapshot, October 6, 2026
23. Crypto Coin Show: Ethena begins backing USDe with tokenized stocks via Binance basis trade, September 25, 2026
24. Crypto Coin Show: CME’s 24/7 crypto launch will kill Bitcoin’s weekend gap, but Monday now matters more, May 27, 2026

Disclosure: This guide is for education only and is not investment, legal or tax advice.