Unichain (UNI) API Documentation

Unichain

Unichain (UNI) is an Ethereum Layer 2 built on the OP Stack, using sequencer-based execution with Ethereum settlement; Flashblocks have provided 200-millisecond sub-block confirmations since August 2025. Solidity contracts execute in an EVM-compatible environment against Ethereum-style account state, while nodes derive and execute Layer 2 blocks and maintain balances, contract storage, receipts, and logs. Because Unichain preserves OP Stack and EVM semantics, Ethereum transaction formats, tooling, and JSON-RPC conventions remain the shared baseline for applications.

Unichain API Methods and Endpoints

NOWNodes exposes Unichain's interface, plus a few others, depending on what your integration needs: JSON-RPC for reading chain state and broadcasting transactions. Archive mode extends any of these to historical states and data beyond standard retention.

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