Overzicht
Flashblocks is a transaction preconfirmation feature on Optimism that provides sub-second feedback (as low as ~250ms) before final block confirmation. Unlike the standard ~2-second block time, Flashblocks lets applications receive early signals about transaction ordering, enabling near-instant UX for time-critical use cases.
Flashblocks is especially useful for:
- Decentralized exchanges and trading platforms – faster order placement feedback
- Onchain games or apps with frequent state updates – smoother real-time gameplay
- Interfaces that benefit from faster feedback – e.g. live dashboards and analytics tools
- Applications that require real-time responsiveness – any latency-sensitive use case
Using Flashblocks with Optimism Endpoints
Flashblocks is currently supported on the networks listed below and can be accessed using your existing Quicknode Optimism endpoint — no additional add-ons are required.
| Netwerk | Flashblocks Availability |
|---|---|
| Optimism Mainnet | ✅ |
| Optimism Sepolia | ✅ |
Supported RPC Methods
Access Flashblocks preconfirmations through your Optimism endpoint by using the pending tag on methods like eth_call, eth_geschatteGas, eth_getBlockByNumber, eth_getBalance, en eth_getTransactionCount. Additionally, fetch Flashblocks related transaction details via methods such as eth_getTransactionReceipt, eth_getTransactionByHash, en eth_simulateV1. You can also use eth_subscribe over WebSocket to stream real-time Flashblock data including new transactions, pending logs, and block state updates, and stop active streams when needed using eth_uitschrijven.
| Methode | Beschrijving |
|---|---|
eth_call | With "pending", executes a call against the latest Flashblock |
eth_geschatteGas | With "pending", estimates gas usage against the latest Flashblock |
eth_getBalance | With "pending", reflects balances from the latest Flashblock |
eth_getBlockByNumber | With "pending", returns the most recent Flashblock |
eth_getLogs | With "pending", returns logs from the latest Flashblock |
eth_getTransactionByHash | Returns the transaction with the specified hash |
eth_getTransactionCount | With "pending", returns the updated nonce from Flashblocks |
eth_getTransactionReceipt | Returns receipts for preconfirmed transactions |
eth_simulateV1 | Simulates transactions against the latest Flashblock state |
eth_subscribe | Subscribes to real-time Flashblock events via WebSocket (e.g., newFlashblocks, newFlashblockTransactions, pendingLogs) |
eth_uitschrijven | Unsubscribes from an active WebSocket subscription created with eth_subscribe |
Bronnen
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