The ERC-1155 multi-token standard, although an improvement in certain aspects over ERC-721, introduced additional bloat and gas inefficiency. ERC-6909 offers a simplified alternative to the ERC-1155 standard by eliminating the contract-level requirement for callbacks and the single-operator permission scheme. As a result, contracts interacting with multi-token standards benefit from improved gas efficiency. A recent implementation of ERC-6909 for Uniswap’s V4 multi-token accounting saw considerable gas improvements for the protocol.