Understand
The Core Structure: Two Capital Structures, One Set of Mechanics
Every lesson so far has involved taking a view on price direction. This lesson is different. The strategies here work whether price goes up or down: because the position is designed to have zero net exposure to price. That is what delta neutral means. You hold offsetting positions that cancel each other out directionally, and what remains is the yield embedded in the relationship between the two legs of the trade.
These are not exotic institutional strategies. Any trader who holds spot BTC and has a derivatives account can run them. The barrier is not sophistication: it is understanding the mechanics well enough to know what you are earning, what the risks are, and when to close the position.
There are two distinct ways to use derivatives spreads. They use the same instruments but they start from completely different positions and serve completely different purposes.
The carry trade
You hold spot BTC and short an equivalent notional in BTC-USD perpetual futures. Your net price exposure is zero. If BTC rises $1,000 your spot gains $1,000 and your short loses $1,000. The positions offset completely. What remains is the funding rate. If funding is positive, your short perpetual collects that payment every eight hours from the longs. You are sitting long BTC, fully hedged, earning yield. During sustained bull markets this has run above 40 percent annualized for extended periods.
The synthetic borrow
You need USD liquidity but you do not want to sell your BTC and lose the price exposure. So you sell the spot BTC, you take the dollars, and simultaneously buy a long perpetual or expiring futures contract of equivalent notional. Your BTC upside is fully intact through the long leg. The cost of maintaining that derivatives exposure is either the funding rate you pay as a long or the basis premium you paid to enter the expiring contract above spot. That cost is your effective borrowing rate. You have borrowed dollars against your BTC at a rate equal to the current funding or basis.
These are not the same trade viewed from different angles. They are two different capital structures. In the carry trade you still hold your spot BTC. In the synthetic borrow you have sold it and replaced the exposure with derivatives. The funding rate and basis are the same numbers in both cases: but in the carry trade they are the yield you collect. In the synthetic borrow they are the interest rate you pay.
Carry trade: hold spot + short derivatives = collect funding or basis as yield. Synthetic borrow: sell spot to raise dollars + long derivatives = maintain upside exposure at a cost equal to the funding rate or basis. Same mechanics. Completely different capital structure. Know which one you are running.
The Four Spread Types
There are four spread structures, each exploiting a different relationship between spot and derivatives instruments.
| Spread Structure | What You Earn | What You Pay to Borrow |
|---|
| Spot vs perpetual | Long spot + short perp | Funding rate when positive |
| Spot vs expiry | Long spot + short expiring futures | Basis, converges to zero at expiry |
| Perp vs expiry | Long perp + short expiry (or reverse) | Differential between funding and basis |
| Calendar spread | Long near expiry + short far expiry | Term structure, contango steepening |
Spot vs Perpetual: In Depth
This is the most accessible carry trade and the starting point for most retail participants. You hold spot BTC and short the BTC-USD perpetual in equal notional. The position is delta neutral. Your income is the funding rate paid by longs to shorts.
The mechanics: if you hold $50,000 in spot BTC and short $50,000 notional in BTC-USD perpetuals, a funding rate of 0.03 percent per eight hours generates approximately $15 per period, $45 per day: on the position. Annualized at that rate the yield is approximately 33 percent on the notional. The actual yield fluctuates with the funding rate, which changes every eight hours.
The risk: funding rate reversal. If the funding rate turns negative, the carry reverses and you are now paying rather than earning. The position should be closed or reduced when funding approaches zero or turns negative. Secondary risk is execution cost: the bid-ask spread on entering and exiting both legs, and the borrow cost if the perpetual short requires margin.
Spot vs Expiring Futures: In Depth
Instead of shorting the perpetual, you short an expiring futures contract. The income here is the basis: the premium the expiring future trades above spot in contango. That premium decays to zero at expiry regardless of where spot goes. If the December futures trade at $1,500 above spot when you enter the trade, you earn that $1,500 per BTC as the basis converges over the life of the contract.
The annualized basis yield can be calculated: $1,500 basis with three months to expiry on a $60,000 BTC price is a 10 percent annualized return on the notional. The basis can be higher or lower depending on market conditions. In strong bull markets, quarterly futures regularly trade at premiums implying 15 to 30 percent annualized. The risk is rollover cost and backwardation. At expiry you need to re-enter the position by shorting the next expiry, which involves transaction costs. If the market has moved into backwardation, futures below spot: the trade loses the carry structure entirely and you are paying to maintain the hedge.
How to Calculate Annualized Funding and Annualized Expiry Basis
Before you can evaluate any spread trade, you need to be able to calculate both legs in annualized terms so you are comparing apples to apples.
Annualized funding rate: take the per-period funding rate and multiply by the number of periods in a year. Most exchanges charge funding every 8 hours: that is 3 periods per day and 1,095 periods per year. A funding rate of 0.03 percent per period multiplied by 1,095 gives an annualized rate of 32.85 percent. The formula: annualized funding = per-period rate × periods per day × 365.
Annualized expiry basis: take the basis, the dollar premium of the expiring futures contract over spot: divide by the spot price to get the percentage basis, then annualize by dividing by the fraction of the year remaining to expiry. If the December quarterly futures trade at $1,800 above a spot price of $60,000 with 90 days to expiry, the percentage basis is 3.0 percent. Annualized over 90 days: 3.0 percent divided by (90 / 365) = 12.2 percent annualized. The formula: annualized basis = (futures price − spot price) / spot price / (days to expiry / 365).
Basis Net of Carry: The Key Comparison
Basis net of carry is the annualized expiry basis minus the annualized perpetual funding rate. It tells you whether the expiring futures contract is expensive or cheap relative to what the perpetual market is currently implying.
If the annualized expiry basis is 12 percent and the annualized perpetual funding rate is 20 percent, the basis net of carry is negative 8 percent. The expiry is cheap relative to the perp: the perp is pricing in more carry than the expiry. The trade is to go long the expiry and short the perp. You are buying the cheap instrument and selling the expensive one. Your expected carry on the spread is approximately 8 percent annualized, earned as the differential converges.
If the annualized expiry basis is 25 percent and the annualized funding rate is 15 percent, the basis net of carry is positive 10 percent. The expiry is expensive relative to the perp. The trade reverses: short the expiry and long the perp. You earn the differential as the two instruments converge.
Basis net of carry is the number professionals use to compare the two instruments on an equal footing. Raw basis and raw funding rate are not directly comparable because they measure different things over different time horizons. Once both are annualized, the comparison is clean.
Positive basis net of carry means the expiry is expensive relative to the perp, short expiry, long perp. Negative means the expiry is cheap: long expiry, short perp. Calculate it before entering. If the annualized yield does not justify the risk and execution cost, the trade does not make sense.
Perp vs Expiry: In Depth
This spread exploits the differential between the perpetual funding rate and the expiring futures basis. When perpetuals trade at a higher implied yield than expiring futures, you go long the perp and short the expiry. The position captures the spread between the two without directional exposure. This is more granular than the other spreads and requires monitoring both legs actively. It is useful when the perpetual funding rate is unusually elevated relative to the basis in expiring contracts: a condition that can occur when retail sentiment is extremely bullish in the spot-perp market but the institutional basis in expiring contracts has not moved as much.
Calendar Spreads: In Depth
A calendar spread involves buying one expiry and selling another. The classic structure is long near-month, short far-month. You profit if the term structure flattens, if the premium between near and far contracts narrows. The reverse, short near, long far: profits if the term structure steepens. Calendar spreads are less correlated to spot price movements than the other structures because both legs are derivatives. The main driver is the shape of the futures curve, which is influenced by institutional hedging demand, funding conditions, and time horizon of market participants. These are the tools that institutional participants use on regulated venues where multiple quarterly contracts trade simultaneously.
The annualized yield on any spread trade is the carry divided by the notional, multiplied by the number of periods in a year. For the spot-perp: (funding rate per 8h × 3 × 365) × notional. For spot-expiry: (basis / spot price) / (days to expiry / 365). Calculate it before entering. If the annualized yield does not justify the risk and execution cost, the trade does not make sense.
Apply
Running a Spot-Perpetual Carry Trade
01Check the current BTC-USD perpetual funding rate. Annualize it: multiply the per-period rate by 3 (daily) then by 365. If the annualized rate is below 10 percent, the carry is thin relative to execution and operational costs. Wait for a better entry.
02Determine your notional size. The spot position and the perpetual short must match exactly in BTC notional, not USD notional. If BTC is at $60,000 and you hold 1 BTC in spot, short 1 BTC worth of perpetual contracts. Any mismatch creates residual delta exposure.
03Open the short perpetual position using isolated margin. This limits your risk to the margin allocated to the short leg. Cross margin would expose your entire account to a move against the short.
04Monitor the funding rate every eight hours. If it turns negative or approaches zero, the carry has reversed or disappeared. Close the short leg first, then assess whether to hold the spot or close entirely.
05For a spot-expiry trade, calculate the annualized basis before entering. Choose an expiry with sufficient time to expiry to justify the rollover cost at the end of the period. Three to six months is typically the right window, enough time for the basis to accrue without excessive rollover frequency.
06Track your total cost of entry and exit including fees on both legs. Carry trades fail when execution costs erode the yield. Know your net yield after fees before you enter.
Case Study
2025 Bull Run: The Carry Trade Across Three Regimes
Through 2025, the BTC-USD perpetual funding rate moved through three distinct regimes, each of which favored a different approach to the carry trade.
In Q1 2025, as BTC moved from $60,000 toward $80,000, funding rates ran modestly positive at 0.01 to 0.03 percent per eight hours: roughly 11 to 33 percent annualized. Traders running spot-perp carry earned steady yield. The basis on quarterly expiring futures was similarly modest, implying 12 to 18 percent annualized. Both structures were open and productive.
In Q3 2025, as BTC approached $100,000 and retail sentiment became extremely bullish, funding rates spiked. Rates above 0.05 percent per eight hours, 54 percent annualized, were sustained for weeks. Carry traders earned exceptional yield on their hedged spot positions. The same elevated funding also made this the most expensive period to run the trade in reverse as a synthetic borrow: anyone using the structure to access USD liquidity was paying above 50 percent annualized on their BTC-collateralized position.
In Q4 2025, after the BTC peak above $126,000 and the subsequent correction, funding rates went negative briefly as sentiment flipped. Traders who had been earning positive carry on spot-perp positions were suddenly paying. Those running the synthetic borrow structure briefly collected yield on what had been a borrowing cost. The carry trade requires active monitoring precisely because of these reversals: the same structure that earns handsomely in one regime pays in another.
The traders who performed best across all three regimes were those who treated the carry as a dynamic position: entering when the annualized yield justified the exposure, sizing down when funding compressed, and closing or reversing when the regime shifted. Not a set-and-forget trade. A managed yield strategy.
Carry trades are regime-dependent. They earn in sustained directional markets where one side of the perpetual is persistently overcrowded. They bleed when the market transitions. The funding rate is your real-time signal. Watch it every 8 hours. When it stops paying, the trade stops working.
Key Takeaway
Zero Delta Strategies Separate Yield from Directional Exposure
Long spot plus short perpetual earns the funding rate. Long spot plus short expiry earns the basis. Selling spot and replacing with long derivatives gives you USD liquidity while keeping your price upside, at a cost equal to the funding rate or basis. Understanding these relationships is what lets you look at a derivatives market and see yield where most traders only see price. Lesson 6 covers options strategies in practice. Lesson 7 introduces technical analysis. Lesson 8 closes with risk management: the framework that determines how much capital to deploy into any of these structures and how to manage them once they are open.
Risk warning: spread trades and carry strategies can reverse sharply during market regime changes. A position that was earning positive carry can become a loss if the funding rate turns negative before you close. Use isolated margin on the derivatives leg. Monitor both legs continuously. Execution costs on both entry and exit reduce net yield, always calculate net return after fees before entering.