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Flashblocks provide faster block confirmations on OP Stack chains by streaming pre-confirmed blocks before they’re finalized on L1. Edge RPC routes to flashblocks-enabled upstreams on supported networks.

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Supported Networks

NetworkChain IDAlias
Base8453base
Base Sepolia84532base-sepolia
Optimism10optimism-mainnet
Optimism Sepolia11155420optimism-sepolia
Unichain130unichain-mainnet
Unichain Testnet1301unichain-testnet

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Usage

Target flashblocks-enabled upstreams by adding use-upstream=flashblocks* to your request: 
https://edge.goldsky.com/standard/evm/8453?secret=YOUR_SECRET&use-upstream=flashblocks*

curl "https://edge.goldsky.com/standard/evm/8453?secret=YOUR_SECRET&use-upstream=flashblocks*" \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'
You can also pass the directive as a header instead of a query parameter: 
curl "https://edge.goldsky.com/standard/evm/8453?secret=YOUR_SECRET" \
  -X POST \
  -H "Content-Type: application/json" \
  -H "X-ERPC-Use-Upstream: flashblocks*" \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'