Flashblocks API Quickstart
Get started building on Optimism using Flashblocks
Introduction
Flashblocks on Optimism are a transaction preconfirmation feature that provides near-instant transaction feedback by streaming partial block updates every 200 milliseconds. This significantly reduces the effective block time from Optimism’s standard 2 seconds to just 200 milliseconds, a 10x increase.
Flashblocks is great for developers who demand instant UX such as decentralized exchanges, onchain gaming, and other high-frequency applications.
Getting started instructions
Flashblocks is currently supported on both Optimism Sepolia testnet and mainnet and can be accessed using your existing Alchemy Optimism RPC.