What was the floor of SAVE ETH (contract 0x355919971b379ca9741ff29939c4ba716f873560) as realized on chain over the pinned 24-hour block window on Ethereum mainnet: the lowest sale price, in wei, among Seaport OrderFulfilled fills of exactly one ERC-721 token of the collection paid in ETH or WETH, fees included, as the definitions say?

What was the average sale price of TatakaeFYT (contract 0xcec6a469ac75330472ab3ced92c2792e0282877f) on OpenSea over the pinned 24-hour block window on Ethereum mainnet, in wei? Compute it from Seaport OrderFulfilled events on chain as the definitions say: every fill of exactly one ERC-721 token of the collection paid in ETH or WETH, price including fees, averaged over those sales and rounded down.

What was the average sale price of Non Playable Character (contract 0xa2a6063b910fc7a7a286196f6c9b62b2797fa0ae) on OpenSea over the pinned 24-hour block window on Ethereum mainnet, in wei? Compute it from Seaport OrderFulfilled events on chain as the definitions say: every fill of exactly one ERC-721 token of the collection paid in ETH or WETH, price including fees, averaged over those sales and rounded down.

Which address sent the most BLUR on Ethereum mainnet in the last 12 hours?

Does the Azuki Elementals NFT contract report a totalSupply() of at least 17,000 at the closing block of the pinned window?

Contracts are already deployed.

Implemented and tested contracts

ABI documentation and an independently reviewed launch.json.

Implemented and tested contracts

ABI documentation and an independently reviewed launch.json.

Implemented and tested contracts

ABI documentation and an independently reviewed launch.json.

Implemented and tested contracts

ABI documentation and an independently reviewed launch.json.

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.

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.

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.

Sealed Bid Auction

Token Bid (BID) and contract SealedBidAuction, where a seller lists an item id with a reserve and a deadline; bidders commit a hash and lock BID, reveal after the deadline, the highest valid revealed bid wins and pays the seller, and every other bidder withdraws their lock.

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.

Time Lock

Token Lock (LOCK) and contract TimeLock, where a depositor locks an amount of LOCK for a beneficiary until a chosen unlock timestamp; only the beneficiary can withdraw after it, a lock cannot be shortened, and locks are enumerable per beneficiary.

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.

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.

Odds and Evens

A simple two-player game played for a fixed-supply launch token, for a Sepolia project launch.

Odds and Evens

A simple two-player game played for a fixed-supply launch token, for a Sepolia project launch.

Build a super simple rock-paper-scissors game as one Solidity contract for Sepolia, with no token, no ETH stakes and no fees: two players, a commit-reveal round (each player commits keccak256(move, salt), then reveals; the contract settles rock, paper, scissors, draws, and a reveal deadline after which the player who revealed wins by forfeit), a public game record and events for created, …

Build a super simple rock-paper-scissors game as one Solidity contract for Sepolia, with no token, no ETH stakes and no fees: two players, a commit-reveal round (each player commits keccak256(move, salt), then reveals; the contract settles rock, paper, scissors, draws, and a reveal deadline after which the player who revealed wins by forfeit), a public game record and events for created, …