Trading Funding Rates on Margin: The Boros Protocol and Rate Hedging

Funding rates are one of the largest recurring cash flows in crypto, and until recently nobody could trade them directly. A perpetual futures trader was exposed to funding whether they wanted to be or not: it arrived as a running cost or a running credit attached to a directional position, with no way to isolate it, hedge it, or take a view on it independently.

Boros exists to separate that cash flow into its own market. Pendle's documentation describes it as "a yield-trading platform on margin by Pendle" that "offers the trading of funding-rates from various avenues, including off-chain funding-rates from centralized exchanges," and elsewhere as "Pendle's interest rate swaps platform with order book mechanics, margin trading, and advanced settlement features."

1. The instrument: what a Yield Unit represents

The tradable unit on Boros is the Yield Unit, abbreviated YU.

Pendle's Boros glossary defines it simply: "Each YU represents yield from 1 unit of collateral in the underlying asset." Applied to a funding market, that means one YU in a BTCUSDT funding market carries the funding rate on one BTC of that perpetual.

Each market references a specific venue and pair. The documentation gives Binance BTCUSDT funding and Hyperliquid HYPEUSDC funding as examples, and notes that the platform is expected to expand to other categories of yield over time. That specificity matters: the funding rate on one venue is not the funding rate on another, and a Boros position references one named source.

Two rates describe every market:

• Underlying APR is "the current APR of the underlying asset (i.e. the current funding rate of the underlying exchange)." It is the floating leg and it changes continuously.
• Implied APR is "the 'price' of the YU in yield percentage terms, essentially the market consensus on what the average future yield of YU will be." It is the fixed leg and it is what you trade against.

2. Which side pays which rate

This is the part that determines whether a Boros position hedges your existing exposure or doubles it, and it is worth reading twice.

This is the structure of a plain vanilla interest rate swap. One counterparty converts a floating obligation into a fixed one, and the other takes the opposite conversion. Neither side is inherently the safe side. Each is a directional view on a rate, and each has a break-even equal to the Implied APR at which the trade was struck.

At maturity, the glossary states, "the position has been fully settled and reflected in your collateral." There is no rollover and no perpetual carry. Every Boros position is dated.

3. Hedging the funding cost on a perpetual position

The most direct application is removing funding uncertainty from a directional perpetual trade.

The situation

You are long a BTC perpetual and intend to hold the position for three months because you have a view on price. In a positive funding regime you pay funding every interval to the shorts. At 0.01% per eight hours, that is roughly 11% annualized, and it is a cost you did not choose and cannot control. If funding spikes during a crowded rally, it can consume a large share of the gain you were right about.

The hedge

Go long YU on the corresponding funding market, sized to your perpetual notional, with a maturity matching your intended hold.

Long YU pays fixed and receives floating. Your perpetual position pays floating. The two floating legs cancel:

What this actually tells you

You have converted a variable cost into a known one, not eliminated it. If the Implied APR is 9%, you now pay 9% for three months regardless of what funding does. You will not be hurt by a funding spike to 40%, and you will not be helped if funding collapses to 2%. Hedging is symmetric.

The price of certainty is visible before you trade. If spot funding is 11% and the Implied APR is 9%, the market's forward view is lower than the current rate, and locking in 9% is cheaper than the running cost you face today. If the Implied APR is 15% against 11% spot, the market expects funding to rise and the hedge is expensive. That comparison, made before entry, is the entire decision.

It separates two views that were previously bundled. Before Boros, a long perpetual position was simultaneously a bet on price and a bet on funding. Hedging the funding leg leaves you with only the view you actually had. For a trader whose edge is directional, paying a known rate to remove an unrelated exposure is a straightforward improvement in the quality of the position.

4. Locking in the carry on a delta-neutral trade

The mirror application matters more to yield-focused capital, and it is where funding-rate swaps have the largest economic effect.

The situation

You run a delta-neutral basis trade: long spot ETH, short the ETH perpetual, collecting funding. The strategy currently earns roughly 11% annualized from funding. The problem is that this is not a yield, it is a floating rate that can fall, hit zero, or turn negative and start costing you, as covered in Ethena and USDe.

The hedge

Go short YU on that funding market for the duration you intend to run the trade, at an Implied APR of, say, 9%.

Short YU pays floating and receives fixed. Your basis trade receives floating. The floating legs cancel:

What this actually tells you

The negative funding scenario is the one worth studying. In the bottom row, unhedged carry is a 4% annualized loss and hedged carry is still a 9% gain. That single row is the reason rate swaps exist. The dominant failure mode of every delta-neutral strategy in crypto is a sustained negative funding regime, and this is the only instrument that directly removes it.

You have turned a strategy into a fixed-income instrument. An unhedged basis trade produces an unpredictable return stream that cannot be underwritten, levered responsibly, or committed to a counterparty in advance. A hedged one produces a known rate over a known term. That transformation is what makes the position financeable, and it is a larger change in the character of the trade than the 2 points of yield given up.

The give-up is real and should be sized deliberately. Locking 9% when spot funding is 11% costs 2 points of expected carry if conditions hold. A trader who hedges every position permanently caps their return at the forward curve. The useful question is whether the volatility of your unhedged carry is worth 2 points to remove, and the answer differs between a small proprietary position and a fund promising a return to allocators.

5. Margin: why duration is your real exposure

Boros positions are margined, and the margin formulas reveal something important about the instrument that perpetual traders routinely miss.

From Pendle's Boros developer documentation:

Initial Margin = Pre-scaling IM × IM Factor × max(Time to Maturity, Time Threshold)

where pre-scaling initial margin is "|Size| × max(|Rate|, Rate Threshold)". Maintenance margin follows the same shape:

Maintenance Margin = |Position Size| × max(|Mark Rate|, Rate Threshold) × MM Factor × max(Time to Maturity, Time Threshold)

And position value itself is defined as "Position Size × Mark Rate × Time to Maturity."

What these formulas actually tell you

Time to maturity is a multiplier on everything. Notional appears once, the rate appears once, and time to maturity appears once, in the value calculation and in both margin requirements. Doubling the maturity of a position roughly doubles its value sensitivity and its margin requirement at the same notional.

Notional alone does not describe your exposure. On a perpetual, exposure is notional and that is the end of it. On a rate swap, total cash flow is rate multiplied by notional multiplied by time, so a $1M position with twelve months to run is roughly four times the exposure of a $1M position with three months to run. Traders who size Boros positions by notional habit from perpetual trading will systematically take four times more risk on long-dated markets than they intended.

Rate moves are magnified by duration. A 200 basis point move in the implied rate on a three-month position is a small mark-to-market change. The same move on a twelve-month position is four times larger. Funding rates are normally mean-reverting, but in a squeeze the implied rate can move sharply, and on a leveraged long-dated position that move arrives multiplied.

6. Liquidation and the health ratio

Boros monitors account solvency with a single ratio:

Health Ratio = Total Value / Total Maintenance Margin

where "Total Value = Account Cash + Σ(Position Values across all markets)". Liquidation is triggered when the health ratio reaches or falls below 1.0. The documentation also describes a forced deleverage mechanism at a 0.7 health ratio and force-cancellation of open orders below a risky-threshold ratio.

Boros also applies per-market open interest limits and leverage caps, which are set by the protocol and adjusted as the system matures. Check the current parameters for the specific market you intend to trade rather than assuming a platform-wide number, because they vary by market and change over time.

7. What Boros is not

It is not a yield product. There is no side of a Boros market that passively earns. Both sides are directional positions on a rate, and each has a counterparty taking the opposite view at the same price.

It is not the same product as Pendle V2. Pendle's yield tokenization splits an on-chain yield-bearing asset into PT and YT, as explained in how Pendle yield trading works. Boros trades funding rates, including ones that originate on centralized exchanges, using margin and an order book. The economic ideas are related and the instruments are not interchangeable.

It does not remove your exposure to the underlying venue. Hedging the funding rate on a Binance perpetual does not hedge your exposure to Binance. Your perpetual position, its margin, and its counterparty risk all remain exactly where they were. A rate swap addresses one cash flow, not the credit relationship behind it.

It does not make a basis trade risk-free. Hedging the funding leg leaves the hedge margin risk, the venue risk, the execution costs, and the smart contract risk of Boros itself. It removes the single largest source of return variance, which is meaningful, and it is not the same as removing risk.

8. Conclusion

Boros completes a set. Perpetual futures let traders take a view on price. Yield tokenization lets them take a view on on-chain yield. Funding rate swaps let them take a view on the cost of leverage itself, and more importantly let them stop taking that view by accident.

The mechanics reduce to three facts. A Yield Unit is one unit of exposure to a specific venue's funding rate. Long YU pays fixed and receives floating, short YU does the reverse, and the Implied APR is the break-even for both. Margin and exposure both scale with notional multiplied by duration, not notional alone.

The two applications worth building a process around are symmetrical. A directional trader paying funding goes long YU to convert an unpredictable cost into a budgeted one. A delta-neutral trader collecting funding goes short YU to convert unpredictable carry into a fixed rate that survives a negative funding regime. In both cases you are paying the difference between the spot rate and the forward rate for certainty, and that price is visible before you commit.

The discipline that matters most is margin separation. The swap and the position it hedges live in different systems, and a liquidated hedge is worse than no hedge, because it unwinds at the worst possible moment and leaves the exposure it was protecting fully open.

For how these instruments fit alongside other on-chain yield strategies, see advanced DeFi yield and hedging strategies.

Frequently asked questions

Sources and further reading

Primary protocol documentation:

• Pendle Documentation — Boros overview
• Pendle Documentation — Boros glossary
• Pendle Documentation — Boros margin mechanics
• Pendle Documentation — Boros documentation hub

Related CoinBeaver articles:

• Advanced DeFi yield and hedging strategies
• How Pendle yield trading works
• Ethena and USDe: the delta-neutral synthetic dollar
• Funding rates explained
• Perpetual futures explained

This article is educational and is not financial advice. All rates and position sizes above are illustrative examples rather than live quotes. Boros market parameters, leverage caps, open interest limits, available markets, and margin factors are set by the protocol and change over time. Verify current parameters for the specific market in the protocol's documentation and application before trading.