Optimism API

Optimism is a Layer-2 scaling solution for Ethereum, aiming to improve transaction throughput and reduce fees by employing optimistic rollups, a technology that enables faster and more cost-effective smart contract execution.

Networks Mainnet
Released 2019
Consensus Optimistic Rollups
Smart contracts Yes
Block time 2 seconds
Smart contract language(s) supported Go, Javascript, Solidity, and Typescript
Get Started with Optimism

Bitcoin
Ethereum
XRP Ledger
Ethereum Classic
Bitcoin Cash
Dash
Litecoin
Dogecoin
Zilliqa
View all supported

The Optimism API — build without running a node

Access Optimism blockchain data through one unified REST API: transaction and address data, balances, block data, and real-time webhooks for on-chain events — with no Optimism node to run and maintain. Start free and scale as you grow.

Blockchain data

Read Optimism transactions, addresses, balances, UTXOs, and block data through one REST API.

Real-time webhooks

Subscribe to on-chain events — incoming and outgoing transactions, confirmations, and mined blocks.

No node to run

Skip the infrastructure — managed, always-synced access with no node to operate or maintain.

View the API docs Start building free

Building a full wallet? Explore Wallet as a Service.

Need prices too? See the crypto price API, or run your own Optimism RPC nodes.

The Optimism Blockchain

Optimism blockchain, crafted by Ethereum developers for Ethereum developers, stands as a swift, reliable, and scalable Layer 2 blockchain. Functioning as a streamlined augmentation to current Ethereum software, Optimism architecture mirrors the EVM, ensuring seamless scalability for your Ethereum applications. If a feature operates on Ethereum, it seamlessly translates to OP Mainnet, offering the same functionality at a significantly reduced cost.