Parsed Flashblocks

GetParsedBdnFlashBlockStream feed provides low-latency access to newly produced Flashblocks on the Base network, parsed into protobuf format for immediate use. Flashblocks are pre-confirmation blocks available before they are finalized on-chain and may differ from the final canonical chain.

This is real-time WS/gRPC, parsed Flashblocks data stream.

Service available via Cloud API only.

Stream Endpoint

• Method: GetParsedBdnFlashBlockStream

• Endpoint: wss://base.blxrbdn.com:5005/ws

Examples

Request

WebSocket

wscat -H "Authorization: <AUTH_HEADER>" \
  -c wss://base.blxrbdn.com:5005/ws \
  --wait 1000 \
  --execute '{"jsonrpc": "2.0", "id": 1, "method": "subscribe", "params": [  "GetParsedBdnFlashBlockStream", {} ]}'

gRPC

Golang

Response (Flashblock Event)

• Index 0 (with Base): Shows the Flashblock plus chain-level context (base).

• Index 1–10 (without Base): Shows Flashblocks without repeating that extra context.

Index 0 (with Base)

<<< {
    "jsonrpc": "2.0",
    "method": "subscribe",
    "params": {
        "subscription": "7e84d5e2-570b-4750-88c4-fe934ad93531",
        "result": {
            "payloadId": "0x039e03386af93ec4",
            "index": "0",
            "base": {
                "parentBeaconBlockRoot": "0x3f2b3d2be05b1aa421062640a52a8fb564c310a6608ee77028b54a4e534a44fd",
                "parentHash": "0xa373c39558c65f2f276de7c5ca24b92b42b86853d05e9cb4bacc3d28d9c3b5ac",
                "feeRecipient": "0x4200000000000000000000000000000000000011",
                "prevRandao": "0xe6e6e07efed22009d57c725011d98d65ae24d568620db7342fa8ae7c3426a8f5",
                "blockNumber": "0x20ba0f2",
                "gasLimit": "0x8f0d180",
                "timestamp": "0x68a19ec7",
                "extraData": "0x000000003200000003",
                "baseFeePerGas": "0x5b777"
            },
            "diff": {
                "stateRoot": "0x0000000000000000000000000000000000000000000000000000000000000000",
                "receiptsRoot": "0x4a27677b9a161f080a4bdce3a56e6dc7ead5ab900ec62f3c7151a519a45cf6be",
                "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
                "gasUsed": "0xb44c",
                "blockHash": "0x5a70134941f5e08c2b6e122042fefc399606f2e9f7911caed6881c06b3e04792",
                "transactions": [
                    "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"
                ],
                "withdrawals": [],
                "withdrawalsRoot": "0x871f79faec942df96cd90e26b473cb2afca8aee4858d5e2d3fae0c3a64e9ce62"
            },
            "metadata": {
                "blockNumber": "34316530",
                "newAccountBalances": {
                    "0x0000f90827f1c53a10cb7a02335b175320002935": "0x0",
                    "0x000f3df6d732807ef1319fb7b8bb8522d0beac02": "0x0",
                    "0x4200000000000000000000000000000000000015": "0x0",
                    "0xdeaddeaddeaddeaddeaddeaddeaddeaddead0001": "0x69076b18a41d8"
                },
                "receipts": {
                    "0x9cfb253a30c498111c6485638b279483c8e61419ee78be3251195c4f88055a02": {
                        "Deposit": {
                            "cumulativeGasUsed": "0xb44c",
                            "logs": [],
                            "status": "0x1",
                            "depositNonce": "0x20ba0f4",
                            "depositReceiptVersion": "0x1"
                        },
                        "Eip1559": null,
                        "Legacy": null
                    }
                }
            }
        }
    }
}

Index 1-10 (without Base)