Vectis × Boros: Fixed Yield on UltraX Arbitrage

1. UltraX Overview: Delta-Neutral Funding Arbitrage, Fully Automated

Vectis UltraX Arb Vault is a delta-neutral funding rate arbitrage vault on Solana. Users can automatically access cross-perp funding rate and basis arbitrage across multiple perp DEXs such as @HyperliquidX, @DriftProtocol, @Aster_DEX, and @Lighter_xyz, while stacking airdrop points from protocols like Lighter S3 and Aster Stage 6.

Rather than being tied to any single venue, UltraX runs 24/7 continuously scanning opportunities and dynamically allocating positions to whichever exchange offers the best spread at the time. The vault uses Cobo MPC institutional-grade wallet infrastructure and offers a 72-hour redemption window.

2. The Challenge: Funding Rate Arbitrage Is Profitable but Unpredictable

The problem? Funding rates are volatile.

A spread that looks like 20% APR today can flip negative tomorrow. Traditional funding rate arb requires constant monitoring, margin rebalancing across multiple venues, and the acceptance that your yield could evaporate — or reverse — at any moment.

At Vectis, even with automation, floating-rate exposure remained the single biggest risk to consistent returns. That changed when we integrated Boros.

3. What Is Boros?

Boros is a yield-trading platform on margin by Pendle which enables the trading of interest rates by representing a floating-yield stream into YU (yield unit). Each YU represents the yield of 1 unit of the collateral asset in the underlying yield bearing asset.

By going Short YUs + a perp position, you receive a fixed funding rate. By going Long YUs + a perp position, you pay a fixed rate.

By using Boros YUs, funding-rate arbitrage can be locked into fixed yield the moment spreads appear, removing funding volatility and directional price risk while remaining scalable — even through negative-rate regimes and with leverage amplification.

4. How Vectis Uses Boros: Two Live Strategies

Below, we walk through two strategies we are actively running: one in crypto-native ETH markets, and one exploiting structural inefficiencies in TradFi-linked gold and silver perps.

➡️ Strategy 1: Lighter × Hyperliquid × Boros ETH Funding Rate Arbitrage

The Opportunity

Funding rates for the same asset differ across exchanges due to differences in liquidity, trader composition, settlement schedules, and risk parameters. These gaps are structural and recurring — not one-off anomalies.

Over the past 14 days, the average ETH funding rate on Lighter has been approximately 0.05% APR, essentially zero. Meanwhile, ETH funding on Hyperliquid has been significantly higher. This creates a natural spread.

The Setup

1. Long ETH on Lighter: where we pay near-zero funding (0.05% APR average)
2. Short ETH on Hyperliquid: where we receive elevated funding
3. Short ETH funding on Boros at 5.6% fixed APR: locking in the Hyperliquid funding rate we receive

Positions 1 + 2 make the trade delta-neutral, we have zero net exposure to ETH price movements. Position 3 converts the volatile Hyperliquid funding rate into a fixed 5.6% APR income stream via Boros.

The Math

With effective 3× leverage (6× on each side), the fixed yield amplifies:

5.6% × 3 = ~16.8% fixed APR

This is a delta-neutral, rate-locked return with no directional price risk and no funding rate volatility. The yield is determined at the moment of entry, not subject to hourly funding fluctuations.

Why Boros Matters Here

Without Boros, this same trade would earn the floating spread between Lighter and Hyperliquid funding rates, a number that swings wildly and can turn negative during market dislocations. We experienced this firsthand during the Q4 2025 negative funding cycle on SOL, where unhedged positions suffered 3–5% weekly drawdowns.

With Boros, the spread is locked. Even if Hyperliquid funding drops to zero or goes negative next week, our fixed 5.6% rate holds until maturity. This is the difference between hoping for yield and owning it.

As Boros’s own case study demonstrated, cross-perp funding rate arbitrage through their platform delivers consistent average yields of 5.98%–11.4% fixed APR across BTC and ETH markets, with peak opportunities exceeding 23% APR, and in one documented instance, as high as 48% fixed APR.

Gold and silver are among the hottest assets in the world right now. In traditional markets, XAU and XAG trade on exchanges like COMEX and the London Bullion Market but these venues close on weekends.

Crypto perpetual exchanges don’t close. Binance and Hyperliquid both offer XAU and XAG perps that trade 24/7, including weekends. This creates a unique structural inefficiency.

What Happens on Weekends

When gold and silver prices surge on crypto exchanges over the weekend, driven by news flow, geopolitical events, or speculative momentum. There is no traditional market open to arbitrage the price back to equilibrium. The result:

• Mark price persistently trades above oracle price on crypto perp exchanges
• This pushes funding rates extremely high , longs pay shorts at elevated rates
• Boros Implied APR for XAU/XAG also spikes to reflect this elevated funding environment

Last weekend, XAU funding on Boros offered fixed yields above 21%.

The Trade

The key insight is that this elevated funding is temporary. When traditional markets reopen on Monday, spot price discovery resumes, and the mark-oracle price gap closes. Funding rates revert to normal levels.

Knowing this, we short funding on Boros during the weekend, locking in the elevated fixed rate before the Monday normalization. By the time funding drops back to baseline, we’ve already captured the premium at a fixed rate.

This is a structurally recurring opportunity. Every weekend where gold or silver sees meaningful price movement in crypto markets creates the same dynamic:

Spiking funding → elevated Boros Implied APR → opportunity to short and lock in the premium.

Why This Strategy Only Works with Boros

Without Boros, you could try to capture weekend funding by simply holding a short perp position on Hyperliquid or Binance. But you’d be exposed to:

• Price risk: if gold continues to rally, your short perp bleeds
• Funding rate reversal: rates could normalize faster than expected, or spike in the other direction
• No way to lock in the rate: you’re at the mercy of each 1-hour or 8-hour settlement

Boros solves all three. By shorting YU instead of the underlying perp, you isolate only the funding rate exposure and lock it in as fixed yield. Your PnL is determined at entry, not by what happens to gold prices over the weekend.

5. The Bigger Picture: Why Boros Is a Game-Changer for Funding Rate Strategies

Across both strategies, Boros fundamentally transforms the risk-return profile of funding rate arbitrage:

From volatile to fixed. Traditional funding arb is a floating-rate game where returns are unknowable in advance. Boros converts this into a fixed-income product, you know your exact yield at the moment of entry.

From fragile to resilient. Negative funding episodes that previously caused drawdowns are now irrelevant. Once a rate is locked on Boros, market conditions can deteriorate without affecting your position.

From capital-heavy to capital-efficient. Boros’s 1000× capital efficiency means hedging a $1M notional position requires only ~$50k in Boros margin. This frees up capital for additional strategies.

From reactive to structural. Rather than constantly monitoring and adjusting positions in response to rate changes, Boros enables a “set and lock” approach. This is particularly powerful for vault-based products like UltraX, where operational simplicity directly translates to better risk management and more consistent returns for depositors.

6. About Vectis Finance

Vectis Finance builds institutional-grade, delta-neutral yield products on Solana. Our flagship UltraX Arbitrage Vault automatically captures funding rate and basis spreads across multiple perp DEXs, including Hyperliquid, Lighter, Aster, and Drift. while stacking airdrop points from protocols like Lighter S3 and Aster Stage 6.

With Boros integration, UltraX now offers fixed-rate yield locking on top of dynamic multi-venue arbitrage, the best of both worlds.

One vault. Multiple exchanges. Fixed yield. 🔒

For readers who want to learn more:

1. Boros: boros.pendle.finance
2. Vectis: Website | Twitter | Telegram
3. Experience UltraX Arb Vault