Robinhood Chain Direct Sequencer Feed(Ultra)

Explore the services, price, endpoint, and integration guide of the BlockRazor Robinhood Chain Direct Sequencer Feed(Ultra).

What Is the Direct Sequencer Feed(Ultra)?

Direct Sequencer Feed (Ultra) is an ultra-low-latency data transmission solution built on the Standard version. It deeply optimizes network routing and underlying transmission mechanisms to further reduce the end-to-end latency of Sequencer Feed delivery.

Powered by BEF technology, the Ultra version provides access to the latest block data at exceptional speed—without requiring users to deploy or operate a node.

The solution is purpose-built for advanced sniping and copy-trading strategies where timing is critical. It enables trading systems to capture on-chain activity earlier and secure valuable time for strategy computation and transaction execution—turning every microsecond into a competitive advantage.

What is the difference between the Node-required Sequencer Feed and the Direct Sequencer Feed?

Comparison	Node-required Sequencer Feed	Direct Sequencer Feed
Access Method	Must be received through a node	Clients can connect directly without running a nod
Block Delivery	Delivers blocks sequentially by block height without skipping any blocks	Prioritizes the latest block; intermediate blocks may be skipped during network congestion
Node State Dependency	Relies on the node’s low-latency synchronized state	Does not require a local node to maintain complete and continuous state synchronization
Deployment Cost	Requires node deployment, maintenance, and monitoring	Easy to integrate, with lower operational costs
Suitable Use Cases	Backrunning and order flow projects	Sniping and copy trading

High-Performance JSON Parsing

Go clients connecting to the Robinhood Chain Direct Sequencer Feed(Ultra) can use ByteDance Sonic to parse JSON messages received over WebSocket. Sonic uses JIT compilation and SIMD acceleration to reduce parsing latency and CPU overhead in latency-sensitive trading systems.

In our benchmarks, Sonic achieved a P50 JSON parsing latency of approximately 2–3 microseconds. Actual performance may vary depending on message size, data structure, CPU architecture, and runtime environment. We recommend benchmarking with real feed data and warming up commonly used Go types before processing latency-sensitive traffic.

Our current reference implementation is written in Go. For trading strategies written in Rust, C++, or other languages, developers can use the above latency as a reference when selecting and benchmarking an equivalent high-performance JSON parsing library.

Price

The price is $200 per unit per day and $2000 per unit per month. Subscribe

Endpoint

ws

Region	Endpoint
Ohio	ws://us.robinhood-feeder.blockrazor.io/ws/direct/ultra/{authToken}

wss

Region	Endpoint
Ohio	wss://us.robinhood-feeder.blockrazor.io/ws/direct/ultra/{authToken}
Tokyo	wss://jp.robinhood-feeder.blockrazor.io/ws/direct/ultra/{authToken}

Usage Instructions

1

Subscribe BlockRazor Sequencer Feed

2

Retrieve the auth from the portal and append it as the URI to the WS URL.

ws://us.robinhood-feeder.blockrazor.io/ws/direct/ultra/{authToken}

3

Choose a WebSocket Client and Establish a WSS Connection

Use any standard WebSocket client, such as a WebSocket library for Node.js, Go, Python, or Rust. There is no need to deploy a Robinhood Chain node or configure --node.feed.input.url.

4

Receive and parse the data. The parsed data structure is as follows:

{
  "version": 1,
  "messages": [
    {
      "sequenceNumber": 50543784,
      "message": {
        "message": {
          "header": {
            "kind": 3,
            "sender": "0xa4b000000000000000000073657175656e636572",
            "blockNumber": 25872577,
            "timestamp": 1788146984,
            "requestId": null,
            "baseFeeL1": 0
          },
          "l2Msg": {
            "encoding": "Nitro L2 message",
            "kind": 3,
            "kindName": "Batch",
            "decodedByteLength": 3487,
            "transactionCount": 10,
            "items": [
              {
                "index": 0,
                "messageKind": 4,
                "messageKindName": "SignedTx",
                "messageLength": 244,
                "transaction": {
                  "hash": "0xc4d8935f3e63b7b4…1e46fd37",
                  "from": "0x0dd10d651d18bc70594cb070e1117b6cd5e4a8a4",
                  "type": 2,
                  "typeName": "EIP-1559",
                  "chainId": 4663,
                  "nonce": 901,
                  "maxPriorityFeePerGas": 1,
                  "maxFeePerGas": 466288000,
                  "gasLimit": 120000,
                  "to": "0x000000000022d473030f116ddee9f6b43ac78ba3",
                  "value": 0,
                  "input": "0x87517c4500000000…6a94fc2f",
                  "accessList": [],
                  "yParity": 0,
                  "r": "0x1a6881f8f30266eb…090c7b15",
                  "s": "0x15e0901b330dfdba…0e9eb53a",
                  "rawTransaction": "0x02f8f08212378203…0e9eb53a"
                }
              },
              {
                "index": 2,
                "messageKind": 4,
                "messageKindName": "SignedTx",
                "messageLength": 341,
                "transaction": {
                  "hash": "0xef96fbbeb7072b85…6c67ee47",
                  "from": "0x137fe0e0fdbfe6487588f0ef842f418bbb738b8e",
                  "type": 0,
                  "typeName": "Legacy",
                  "chainId": 4663,
                  "nonce": 14,
                  "gasPrice": 250000000,
                  "gasLimit": 400000,
                  "to": "0xcaf681a66d020601342297493863e78c959e5cb2",
                  "value": 40000000000000,
                  "input": "0x04e45aaf00000000…00000000",
                  "v": 9362,
                  "yParity": 1,
                  "r": "0xe65d56b7f3eb63d7…4656bb9c",
                  "s": "0x4362c24ab37d7590…88c290ce",
                  "rawTransaction": "0xf901510e840ee6b2…88c290ce"
                }
              },
              {
                "index": 4,
                "messageKind": 4,
                "messageKindName": "SignedTx",
                "messageLength": 119,
                "transaction": {
                  "hash": "0x00f4bb0661c05fe8…3938c8bf",
                  "from": "0x6ae3de978e63b63e8486d1f495339633495d8264",
                  "type": 2,
                  "typeName": "EIP-1559",
                  "chainId": 4663,
                  "nonce": 3,
                  "maxPriorityFeePerGas": 234192000,
                  "maxFeePerGas": 542634600,
                  "gasLimit": 35010,
                  "to": "0xc45aa399aa75ace0ae56c372898abcb36d33161f",
                  "value": 330170416874734,
                  "input": "0x",
                  "accessList": [],
                  "yParity": 1,
                  "r": "0xdda460f047c07f2a…67caa4a0",
                  "s": "0x5f82128ed043cc80…4d2f6024",
                  "rawTransaction": "0x02f8738212370384…4d2f6024"
                }
              }
            ]
          },
          "l2MsgBase64": "AwAAAAAAAAD0BAL48I…jqF1iw=="
        },
        "delayedMessagesRead": 193164
      },
      "blockHash": "0x220c2e737333e10d…2e261230",
      "signatureV2": "Rg3J2yhBQ8pxYUqc6e…xkNk7wA=",
      "blockMetadata": null
    }
  ]
}