Sei (SEI) API Documentation

Sei

Sei (SEI) is an EVM-compatible Layer 1 using Twin Turbo Consensus, an optimized Tendermint-derived proof-of-stake design, with parallel execution built into its current EVM architecture. Solidity, Vyper, and Yul contracts execute against account-based EVM state, while nodes process transactions in parallel where possible and maintain balances, contract storage, blocks, receipts, logs, and consensus state. This parallel EVM model preserves Ethereum contract and transaction semantics, making standard EVM tooling and JSON-RPC conventions applicable despite different execution and consensus internals.

Sei API Methods and Endpoints

NOWNodes exposes Sei's interface, plus a few others, depending on what your integration needs: JSON-RPC for reading chain state and broadcasting transactions, and Trace/Debug for step-level execution analysis.

Browse the interfaces below for endpoint details, request parameters, response formats, and integration examples. Create an API key, select Mainnet or Testnet, choose the required interface, and start sending requests from your application.

Weighing Sei RPC providers against each other? Read the comparison guide on our blog — this page stays focused on integration reference.