RouletteSwap🎰

Pick your fee. Or pick your luck.

A Uniswap v4 Hook on X Layer. Live on testnet now.

Built for @XLayerOfficial × @Uniswap × @flapdotsh hackathon 🎰

[RouletteSwap🎰 @RouletteSwap]

🎰 Introducing RouletteSwap — a Uniswap v4 Hook where every swap is a coin flip you opt into.

Safe: flat 30 bps
Risky: 5/6 of 5 bps · 1/6 of 155 bps

Expected fee identical. LP economics neutral.

Live on @XLayerOfficial testnet 🧵

#BuildX

[RouletteSwap🎰 @RouletteSwap]

24 Risky swaps on @RouletteSwap "Beat the House" mode.

bust 2 · survive 22 (RNG was kind today)

paid: 420 bps
if all Safe: 720 bps
→ saved 300 bps

LP economics unchanged. variance is a feature, not a bug.

@XLayerOfficial #BuildX

[RouletteSwap🎰 @RouletteSwap]

why 5/6 odds, not 9/10 or 99/100?

EV must equal 30 bps → bust fee is forced:
1/6 → 155 bps (5x baseline)
1/10 → 255 bps (8.5x)
1/100 → 2,500+ (degen-only)

5/6 = d6 intuition · cheap to compute · real variance · survivable bust

@XLayerOfficial #BuildX

[RouletteSwap🎰 @RouletteSwap]

how to prove a "5/6 chance of 5 bps · 1/6 of 155" hook is actually EV-neutral?

let Foundry do it.

600 trials. mean fee within ±20% of 3000 pips. bust frequency within ±35% of 1/6.

if either bound trips, the contract ships broken.

8/8 tests green.

@XLayerOfficial #BuildX

[RouletteSwap🎰 @RouletteSwap]

every v4 fee hook asks "what's the fee?"

nobody asks "what's the fee DISTRIBUTION?"

RouletteSwap:

uint24 lpFee = roll() == BUST ? 15_500 : 500;

5 bps survive · 155 bust · 1/6 odds · LP-EV-neutral

@XLayerOfficial #BuildX

[RouletteSwap🎰 @RouletteSwap]

@XLayerOfficial @Uniswap @flapdotsh The math:

E[Safe] = 30 bps
E[Risky] = (5/6)·5 + (1/6)·155 = 30 bps

Identical EV — verified by a 600-trial Foundry invariant. LPs see zero EV impact. Strict Pareto improvement on AMM fee design.

Hook: https://t.co/fH24QglZr5

[RouletteSwap🎰 @RouletteSwap]

🎰 Introducing RouletteSwap — a Uniswap v4 Hook where every swap is a coin flip you opt into.

Safe: flat 30 bps
Risky: 5/6 of 5 bps · 1/6 of 155 bps

Expected fee identical. LP economics neutral.

Live on @XLayerOfficial testnet 🧵

#BuildX

[RouletteSwap🎰 @RouletteSwap]

@XLayerOfficial Built for the @XLayerOfficial × @Uniswap × @flapdotsh "Hook the Future" hackathon.

One contract. ~110 LOC of business logic. No oracles. No admin keys. No token. Just per-swap risk election attached to a real v4 pool.

Code: https://t.co/rRIkrnPbRn