Byzantium Era

April 2018 'Lambo' ERC-20 with permissionless mint() — one free token per address. mintMore() gives 10 LAMBO for 1 wei (effectively free).

ERC223-compatible deposit wallet. Accepts token transfers via tokenFallback and sweeps held ERC20 tokens to a configured owner address.

June 2018 NFT exoplanet collectible game with 9-tier hot-potato pricing, presale mode, and per-planet life rate / crypto match / tech bonuses. Extends the Crypt

Token distributor with a dedicated spender role. Allows approved spenders to transfer ERC20 tokens held by the contract to designated recipients.

Token vesting lockup contract. Holds ERC20 tokens for a beneficiary until end_time, then allows release() to transfer them. lockOver() checks completion.

A CryptoKitties birth bot that earns midwife rewards while deploying self-destructing child contracts for gas refunds.

A gas storage contract minted by CKBirthBot, a gas token derivative used by CryptoKitties-era bots to optimize transaction costs.