WebSocket Connections
Sei supportseth_subscribe over WebSocket. You can subscribe to new blocks, event logs, and pending transactions using standard library WebSocket transports.
Endpoints
Connecting
Watching New Blocks
Watching Contract Events
Watching ERC-20 Transfers Across All Contracts
Notes
- Sei’s instant finality means every block emitted over WebSocket is already final — no need to wait for additional confirmations before acting on an event.
- Pending transaction subscriptions (
newPendingTransactions) are supported at the RPC level but Sei does not guarantee Ethereum-style pending state visibility.