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Overview

Flashblocks bring sub-second transaction confirmations to OP Stack rollups, now available through Gelato RaaS.
Instead of waiting for full blocks (e.g. 2s on Optimism or 12s on Ethereum), Flashblocks deliver execution preconfirmations in ~200ms by streaming lightweight partial blocks.

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Why Flashblocks?

  • Near-instant confirmations: Users see transaction receipts in milliseconds.
  • No EVM-equivalence trade-offs: Expensive operations like state root generation are deferred to full blocks.
  • Efficient scaling: Amortizes computation while supporting higher gas throughput.
  • Better UX: Feels like Web2 responsiveness, critical for DeFi, gaming, and real-time apps.

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How It Works

  • Transactions are executed in ephemeral partial blocks every 200ms.
  • Heavy computation (state roots, consensus) happens only once per full block.
  • RPC nodes can serve flashblock state directly, enabling wallets and dApps to reflect balances or swaps instantly.

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Open Source Infrastructure

Flashblocks are powered by Flashbots contributions:
  • op-rbuilder – Rust-based block builder separating execution from state commitment.
  • Rollup-Boost – TEE-based, verifiable block building framework.
  • Flashblocks WebSocket Proxy – Streams flashblocks securely to RPC nodes (contributed by Base).

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Benefits

  • Real-time DeFi with more capital-efficient markets.
  • Ultra-low latency for trading, payments, and gaming.
  • Compatible today with OP Stack rollups via Gelato RaaS.

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Get Started

Flashblocks support is production-ready on Gelato RaaS. Contact the Gelato team to enable Flashblocks on your OP Stack chain.