Drift vs Sour

At a glance

Drift figures reflect the broad characterization of the product, not a real-time snapshot. Sour figures reflect the v1.0.7 mainnet protocol.

What Drift is good at

Drift earned its position. It has been live on Solana since 2021, survived a security incident, recovered, and is now the largest Solana perp DEX by cumulative volume — roughly $148B cleared. That is not a number you fake, and it implies real liquidity, real maker presence, and real edge cases stress-tested by years of production trading.

On product surface, Drift offers more breadth than Sour does today. Dozens of markets including long-tail tokens. Multiple collateral types beyond USDC, with a cross-margin model that lets traders post non-stable collateral against perps. Maker rebates and DRIFT-staking fee discounts that, for high-frequency makers, beat a flat-fee model on a per-trade basis. A continuous CLOB with JIT auctions gives professional makers the ability to compete on every incoming taker order, which is the matching model HFT firms are built around.

It is also audited and listed on DefiLlama, CoinGecko, and CoinMarketCap. For a fund or treasury that requires a checked-off third-party audit before trading, Drift clears that bar today and Sour does not.

What Sour does that Drift does not

These are the structural differences — not feature checklists, but properties of the matching engine itself.

• BATCH CLEARING IS MEV-RESISTANT BY CONSTRUCTION
  Every order accepted into a 1.8s batch fills at the same uniform clearing price, settled atomically. There is no transaction-ordering edge to extract inside the auction window. Sandwich attacks are not mitigated; the surface is structurally absent. See /learn/mev-resistant-by-design.
• FUNDING IS COMPUTED INSIDE SETTLEMENT, NOT ON A CRON
  Drift uses a periodic 8-hour funding pattern. Sour computes funding inside every batch as part of the settlement step, with no off-chain scheduler and no cron job to fail. The funding rate is always current, never stale. See /learn/no-funding-cron-perps.
• SETTLEMENT MATH IS FORMALLY VERIFIED
  18 Kani bounded model checks, a Lean specification of the aggregate-budget invariant, and 15 property tests run continuously against the protocol. No Solana perp DEX has shipped this depth of mechanical verification. See /learn/formally-verified-perp-dex.
• FLAT 3 BPS, NO TIER LADDER, NO TOKEN GATE
  A first-day trader and a top-decile market-maker pay the same 3 bps per fill. No volume tiers, no staking rebates, no maker/taker split. 100% of fees go to the LP vault. See /learn/flat-fee-perp-dex.

When to pick Drift

Pick Drift if breadth matters more than matching-model purity. If you trade long-tail Solana tokens that Sour does not list, that is dispositive — Sour launched with three markets (SOL-PERP, BTC-PERP, ETH-PERP) and the rest is a roadmap question.

Pick Drift if you need to post non-USDC collateral. Drift accepts multiple collateral types and cross-margins them; Sour is USDC-quoted only at v1.0.7. If your treasury holds SOL or LSTs that you would rather not unwrap to USDC, Drift fits and Sour does not.

Pick Drift if your trading desk requires a third-party security audit before you can route flow. Drift is audited; Sour has formal verification but no third-party audit yet, and that is a real gap for institutional users.

Pick Drift if you are a high-frequency maker who depends on continuous-CLOB microstructure — sub-slot quote updates, JIT auction participation, and maker rebates compounding into a token-staking program. The flat-fee model on Sour is worse for that profile.

When to pick Sour

Pick Sour if MEV exposure on every fill is something you actually pay attention to. Sandwich-attack-resistance is not a marketing phrase here; it follows from the matching engine. Inside a 1.8-second batch, no validator or searcher can reorder you for spread.

Pick Sour if you want flat-fee math without volume tiers and without a token to stake. The cost of a fill is the cost of a fill. Backtests stay honest because there is no rebate ladder to assume yourself into.

Pick Sour if mechanical verification of settlement math matters to you more than the marketing word "audited." 18 Kani proofs and a Lean spec are reproducible artifacts at github.com/GageBachik/sour-verification. They check the protocol invariant on every PR; an audit is a snapshot review.

Pick Sour if you are new to perps and want the simplest possible UX. Degen Mode caps your max loss at the bet size, so the first time a position blows up you are not surprised by liquidation mechanics you did not understand. Pro Mode is on the same orderbook for when you graduate.

Sour reference

PROGRAM ID

souryQgnM1xiNuGcmVYLPGT3MKqnGN8QTqP8zk8eape

NETWORK

Solana mainnet

BATCH SLOT

1.8 seconds

FEE

Flat 3 bps per fill, 100% to LP vault

MAX LEVERAGE

50×

MARKETS

SOL-PERP, BTC-PERP, ETH-PERP

VERIFICATION

github.com/GageBachik/sour-verification

AUDIT

No third-party audit yet