Quorum

A simple, elegant protocol on Sepolia with its own token QRM, the CommitRevealVote contract, a full Foundry test suite, independent reviews, GitHub publication and a public website on IPFS to use it.

Splitwise

A simple, elegant protocol on Sepolia with its own token SPLT, the TipSplitter contract, a full Foundry test suite, independent reviews, GitHub publication and a public website on IPFS to use it.

Timebox

A simple, elegant protocol on Sepolia with its own token TBOX, the TimeLockSavings contract, a full Foundry test suite, independent reviews, GitHub publication and a public website on IPFS to use it.

Streamline

A simple, elegant protocol on Sepolia with its own token STRM, the StreamingVault contract, a full Foundry test suite, independent reviews, GitHub publication and a public website on IPFS to use it.

Starting from a tree with nothing in it

Deliver one small but complete standalone Foundry project, and nothing more.

LaunchFeeLadderHook

A simple, creative Uniswap v4 hook: a dynamic-fee hook for new pools: the fee starts at a high value at pool initialization and decays linearly to a floor over the first N blocks (all three fixed at construction), then stays at the floor; per-PoolId start block recorded in afterInitialize.

BlockParityFeeHook

A simple, creative Uniswap v4 hook: a playful dynamic-fee hook: swaps in even-numbered blocks pay a low fee and odd-numbered blocks a high fee, both fixed at construction, applied in beforeSwap from block.number.

NoRoundTripHook

A simple, creative Uniswap v4 hook: a hook that forbids an address from swapping in both directions in the same pool within one block: beforeSwap records the block and direction of the caller's last swap per PoolId and reverts the opposite direction in the same block.

TickBandGateHook

A simple, creative Uniswap v4 hook: a peg-band hook for stable pairs: at initialization the hook records a band [minTick, maxTick] fixed at construction, and afterSwap reverts (undoing the swap) if the pool's tick leaves the band, so the pool trades only inside it.

SwapSizeCapHook

A simple, creative Uniswap v4 hook: a hook that caps a single swap at a fraction of the pool's liquidity: beforeSwap reverts if the specified amount exceeds one tenth of the current liquidity read from the PoolManager; the fraction is fixed at construction.

AllowlistLiquidityHook

A simple, creative Uniswap v4 hook: a hook where only addresses in an allowlist fixed at construction may add liquidity to a pool, while anyone may swap; beforeAddLiquidity reverts for everyone else and beforeRemoveLiquidity is never restricted.

PriceMoveBreakerHook

A simple, creative Uniswap v4 hook: a simple circuit breaker: afterSwap records the pool tick per block, and if the tick has moved more than 1000 ticks within the last 100 blocks the hook refuses swaps in that pool for the next 50 blocks, then resumes; a bounded ring of observations, no admin.

LiquidityLockHook

A simple, creative Uniswap v4 hook: a hook that enforces a minimum liquidity hold: beforeAddLiquidity records the block per (PoolId, owner), and beforeRemoveLiquidity reverts unless at least N blocks (fixed at construction) have passed since that owner's most recent add in that pool.

SwapMilestoneHook

A simple, creative Uniswap v4 hook: an accounting-only hook: afterSwap counts swaps per PoolId and per swapper, exposes both counts through view functions, and emits a Milestone event every 100 swaps for the pool.

WhaleTaxHook

A simple, creative Uniswap v4 hook: a dynamic-fee hook that charges a higher fee to large swaps: a swap whose specified amount exceeds one percent of the pool's current liquidity (read from the PoolManager) pays the high fee, others the base fee, both fixed at construction.

DirectionalFeeHook

A simple, creative Uniswap v4 hook: a dynamic-fee hook with two fees per pool, one per swap direction, fixed at construction: swaps zeroForOne pay one fee and oneForZero the other, so a pool can tax one side more.

FirstSwapOfDayHook

A simple, creative Uniswap v4 hook: a dynamic-fee hook where the first swap of each UTC day in a pool pays zero LP fee and every later swap that day pays the pool's base fee set at construction.

CooldownHook

A simple, creative Uniswap v4 hook: a hook that lets each address swap at most once per pool every N blocks (N fixed at construction, between 1 and 1000): beforeSwap records the caller's last swap block per PoolId and reverts a second swap inside the window.

VolumeTierFeeHook

A simple, creative Uniswap v4 hook: a dynamic-fee hook that lowers the fee as a pool gets busier: per PoolId, track swap volume in the current one-hour bucket (input amount in the pool's currency0 or currency1, by direction), and charge 30 bps below 100 units, 20 bps below 1000, 10 bps above; the bucket resets each hour.

HourlyFeeHook

A simple, creative Uniswap v4 hook: a dynamic-fee hook that charges a different LP fee by UTC hour: a 24-entry fee schedule fixed at construction (in hundredths of a bip, each at most 1%), applied in beforeSwap from block.timestamp.

Streaming Payments

Token Stream (STRM) and contract StreamingPayments, where a sender opens a stream to a recipient by depositing STRM for a start and stop time; the recipient withdraws what has streamed so far at any time; the sender may cancel and both sides receive exactly their accrued shares.

Two Party Escrow

Token Escrow (ESCR) and contract TwoPartyEscrow, where a buyer deposits ESCR naming a seller and a deadline; the buyer may release to the seller at any time, the seller may refund the buyer at any time, and after the deadline the buyer may reclaim an unreleased deposit; no third party.

Guestbook

Token Guest (GUEST) and contract Guestbook, where posting a message of up to 140 bytes costs a fixed one GUEST that is sent to the dead address 0x000000000000000000000000000000000000dEaD; entries are stored with author and timestamp, enumerable, and never editable.

Token Voting

Token Vote (VOTE) and contract TokenVoting, where any holder opens a proposal with a text hash and a deadline; holders vote for or against once per proposal, weighted by their VOTE balance at the moment they vote; results are readable after the deadline and nothing executes on chain.

Bounty Board

Token Bounty (BNTY) and contract BountyBoard, where a poster escrows BNTY behind a task hash with a deadline; anyone submits a work hash; the poster accepts one submission, which pays the submitter, or reclaims after the deadline when nothing was accepted.