The Characters The Meebits are 20,000 unique 3D voxel characters, created by a custom generative algorithm, then registered on the Ethereum blockchain. ERC-721 The NFT contract the governs ownership is a standard ERC-721 that works with any compatible service or exchange. Integrated No-Fee Marketplace Also included in the contract is a custom marketplace that supports like-kind trading of up to 100 Meebits per transaction, along with all the standard buy, bid and ask transactions.