BNB Smart Chain Builder

Fairbuilder operates a low-latency relay dedicated to BNB Smart Chain validators. Use the private endpoint below to submit bundles and private transactions.

RPC Endpoint
https://rpc.fairbuilder.xyz
Builder Address
0x000000000000df5468b64A74B36E3eD30783AaA8

RPC Methods

eth_sendBundle

Submit a Flashbots-compatible bundle.

{
  "jsonrpc": "2.0",
  "method": "eth_sendBundle",
  "id": 1,
  "params": [{
    "txs": ["0xabcd1234..."], // required: signed transactions
    "maxBlockNumber": 65524621, // optional: defaults to current block + 100
    "maxTimestamp": 1691081660, // optional: unix expiry for the bundle
    "revertingTxHashes": [], // optional: allow listed tx hashes to revert
    "noMerge": false // optional: skip relay-side bundle consolidation, default is false
  }]
}
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x3a99..." // bundle hash
}

eth_sendRawTransaction

Deliver a single signed transaction straight to builders.

{
  "jsonrpc": "2.0",
  "method": "eth_sendRawTransaction",
  "id": 44,
  "params": ["0xabcd1234..."] // required: one signed transaction
}
{
  "jsonrpc": "2.0",
  "id": 44,
  "result": "0x7bc1..." // transaction hash
}