We are upgrading our Hedera JSON-RPC Relay infrastructure from v0.76.2 to v0.77.0. This is a significant release with multiple breaking changes to default behavior, performance and reliability improvements, and EVM compatibility fixes.
During the maintenance window, customers may experience intermittent disruptions to RPC availability as nodes are rotated through the upgrade process.
RPC Changes:
eth_getBalance and other balance-returning methods — return values are now denominated in weibar instead of HBAR, aligning with Mirror Node. Applications that expected HBAR-denominated values will need to be updated.
eth_sendRawTransaction — now waits for full transaction confirmation before returning instead of returning the transaction hash immediately. Clients that rely on hash-and-go submission will see increased response latency on this method.
eth_subscribe — WebSocket subscriptions are now enabled by default. eth_feeHistory — the gasUsedRatio field is now populated in responses, improving EIP-1559 fee estimation compatibility.
WebSocket parity — all HTTP JSON-RPC methods are now available over WebSocket connections.
Concurrent submissions — a two-lock nonce sequencing mechanism resolves a race condition affecting concurrent eth_sendRawTransaction calls.
debug_traceTransaction — fixed a bug where the to field could incorrectly appear as null for contract creation transactions.