Send bundles to BuildAI

Users can send Flashbots bundles to one of the URLs below.

Bundle Relay URLs​

Network	URL
Mainnet	https://buildai.net
Sepolia	https://buildai.net/sepolia

JSON-RPC methods supported:

eth_sendBundle​

eth_sendBundle can be used to send your bundles to our builder. The eth_sendBundle RPC has the following payload format:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_sendBundle",
  "params": [
    {
      txs,               // Array[String], A list of signed transactions to execute in an atomic bundle
      blockNumber,       // String, a hex encoded block number for which this bundle is valid on
      minTimestamp,      // (Optional) Number, the minimum timestamp for which this bundle is valid, in seconds since the unix epoch
      maxTimestamp,      // (Optional) Number, the maximum timestamp for which this bundle is valid, in seconds since the unix epoch
      revertingTxHashes, // (Optional) Array[String], A list of tx hashes that are allowed to revert
      refundPercent,     // (Optional) Number, the percentage (from 0 to 99) of bundle tip that should be passed back to the refundRecipient
      refundRecipient,   // (Optional) Address, account that will receive the refund from this bundle, defaults to the sender of the first transaction
    }
  ]
}

If the refundPercent field is set, the builder will pass refundPercent of the bundle tip minus the cost of the refund transfer to the refundRecipient. If the cost of the refund transfer is greater than the refund amount, the bundle will still be included, but no refund will occur.

example:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_sendBundle",
  "params": [
    {
      "txs": ["0x123abc...", "0x456def..."],
      "blockNumber": "0xb63dcd",
      "minTimestamp": 0,
      "maxTimestamp": 1615920932,
      "refundPercent": 10,
      "refundRecipient": "0x123abc..."
    }
  ]
}

example response:

{
  "jsonrpc": "2.0",
  "id": "1",
  "result": {
    "bundleHash": "0x2228f5d8954ce31dc1601a8ba264dbd401bf1428388ce88238932815c5d6f23f"
  }
}

Note: Flashbots signature header is not required.