- The Hiero JSON-RPC Relay is updating default settings in its v0.77.0 release scheduled for April 20th, 2026.
- Changes align the relay’s behavior with standard Ethereum node expectations, enabling transaction pools and WebSocket subscriptions by default.
- Operators must review configurations before upgrading; existing behavior can be preserved by manually setting environment variables.
The Hiero JSON-RPC Relay will update several default configuration settings with its upcoming v0.77.0 release on April 20th, 2026, altering its operational behavior to better match standard Ethereum JSON-RPC implementations. This shift is detailed in the official release notes on the Hedera.com/blog/upcoming-change-hiero-json-rpc-relay-default-configuration-updates-v0-77-0-20th-april-2026/”>Hedera blog, targeting developers who use the relay as an Ethereum-compatible interface. Consequently, systems relying on out-of-the-box settings will experience changes in resource usage and transaction handling post-upgrade.
The update enables the transaction pool and WebSocket subscriptions by default, which may increase memory usage and long-lived connections. However, it disables Redis support and asynchronous transaction processing by default, altering how data is cached and processed. Meanwhile, internal rate limiting will also be disabled by default, which could lead to higher operational costs on metered service plans unless explicitly reconfigured.
Hedera states the changes move the relay closer to the behavior expected by common Ethereum tools like wallets and dApp backends. Operators who wish to maintain their current system performance must manually set specific environment variables to the old defaults before upgrading. For further assistance during this transition, the project directs users to its Discord server or other official community channels.
✅ Follow BITNEWSBOT on Telegram, Facebook, LinkedIn, X.com, and Google News for instant updates.
