Flashblocks API Quickstart
Introduction
Flashblocks on Unichain enable ultra-fast transaction confirmations by providing preconfirmations - instant signals that arrive before the next block is finalized. Instead of waiting up to 2 seconds for block confirmation, users receive transaction feedback in just 200 milliseconds, a 10x improvement.
Built as an “out-of-protocol” extension, Flashblocks work by streaming partial block updates every 200ms without modifying Unichain’s core consensus. This makes them perfect for developers building DeFi applications, marketplaces, payment systems, and other applications where instant confirmations create seamless user experiences.
Getting started instructions
Flashblocks is currently supported on both Unichain testnet and mainnet and can be accessed using your existing Alchemy Unichain RPC.
Flashblocks-enabled API Endpoints
- eth_getBlockByNumber
- eth_getTransactionReceipt
- eth_getBalance
- eth_getTransactionCount
- eth_getTransactionByHash
Also check out the Official Unichain Flashblocks Docs!