@metamask/eth-json-rpc-filters

Implementation of Ethereum JSON-RPC filter methods (eth_newFilter, eth_newBlockFilter, eth_newPendingTransactionFilter, eth_uninstallFilter, eth_getFilterChanges, eth_getFilterLogs) as middleware for json-rpc-engine. Current stable version: 9.0.0. Uses eth-block-tracker for block polling and requires an EIP-1193 provider. Key differentiator: specifically designed for MetaMask's architecture, wrapping web3 providers into filter middleware. Supports Node.js >=14.0.0. v7.0.0 renamed from eth-json-rpc-filters to @metamask/eth-json-rpc-filters and dropped Node.js <16.