LEARN
How Sour Flow Perps work
Sour is a Solana perpetual futures DEX that clears every 1.8 seconds at one uniform price, charges a flat 3 bps per fill, and ships with a formally verified settlement model. These pages explain each piece of the mechanism in plain English.
- → What are Flow Perps?Flow Perps are batch-cleared perpetual futures: every order in a slot settles at one uniform price. The canonical reference.
- → Batch-cleared perpetuals explainedHow frequent batch auctions remove the front-run / back-run lanes that continuous orderbook perps are built around.
- → MEV-resistant by designWhy batch clearing makes sandwich attacks structurally impossible inside the auction window — not just “mitigated”.
- → Perpetuals without a funding cronSour’s funding payment is computed inside every batch — no off-chain keeper, no cron, no missed-block edge cases.
- → Formally verified perp DEX18 Kani model-checked proofs, a Lean specification of the Option H aggregate budget, and 15 generative property tests.
- → Flat-fee perp DEXA single 3 bps fee per fill, regardless of size, taker/maker, tier, or volume. 100% routes to the LP vault.
- → What is a perpetual futures DEX?A beginner’s guide to perpetual futures, decentralized exchanges, and how the two combine on Solana.
- → Per-user OI capHow Sour bounds individual trader exposure as a function of LP NAV — the LP-scaled per-user open-interest cap.