> For the complete documentation index, see [llms.txt](https://docs.blockrazor.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.blockrazor.io/transaction-submission/block-builder/send-bundle.md).

# BSC Block Builder Send Bundle API Reference

Use the BlockRazor BSC Block Builder Send Bundle API. Review the endpoint, parameters, request format, response fields, and integration example.

### Introduction

This API is used to receive bundles, with the method name `eth_sendBundle`.

The block construction algorithm of BlockRazor Builder favors bundles that transfer more native tokens (BNB) to BlockRazor Builder EOA of which address is

```
0xc7d4187cBda07F4b5be04418B9723b5faF65dB5C
```

The gas price for transactions within the bundle must be at least the minimum standard required by BSC Validators (Currently at 0.05 gwei).

### Request Parameter

<table data-search="false"><thead><tr><th width="144">Parameters</th><th width="118">Mandatory</th><th width="116">Format</th><th width="136">Example</th><th>Description</th></tr></thead><tbody><tr><td>txs</td><td>Mandatory</td><td>array[hex]</td><td>["0x…4b", "0x…5c"]</td><td>List of signed raw transactions</td></tr><tr><td>maxBlockNumber</td><td>Optional</td><td>uint64</td><td>39177941</td><td>The maximum block number for the bundle to be valid, with the default set to the current block number + 100</td></tr><tr><td>minTimestamp</td><td>Optional</td><td>uint64</td><td>1710229370</td><td>Expected minimum Unix timestamp (in seconds) for the bundle to be valid</td></tr><tr><td>maxTimestamp</td><td>Optional</td><td>uint64</td><td>1710829390</td><td>Expected maximum Unix timestamp (in seconds) for the bundle to be valid</td></tr><tr><td>revertingTxHashes</td><td>Optional</td><td>array[hash]</td><td>["0x…c7", "0x…b7"]</td><td>List of transaction hashes allowed for revert</td></tr><tr><td>noMerge</td><td>Optional</td><td>bool</td><td>false</td><td>Bundle merge can increase block value and inclusion rate. If not set, the default value is false (allowing bundle merging)</td></tr><tr><td>positionFirst</td><td>Optional</td><td>bool</td><td>false</td><td>Strictly order bundles by priorityFee. If set to false (default), late-arriving bundles may be appended to the block tail to guarantee inclusion in the current block.</td></tr></tbody></table>

### Request Example

{% tabs %}
{% tab title="HTTPS" %}

```bash
curl https://virginia.builder.blockrazor.io \
  -H 'content-type: application/json' \
  -H 'Authorization: <auth-token>' \
  --data '{
    "jsonrpc": "2.0",
    "id": "1",
    "method": "eth_sendBundle",
    "params": [{
      "txs": [
        "0x...4b",
        "0x...5c"
      ],
      "maxBlockNumber": 39177941,
      "minTimestamp": 1710229370,
      "maxTimestamp": 1710829390,
      "revertingTxHashes": [
        "0x44b89abe860142d3c3bda789cf955b69ba00b71882cd968ec407a70f4719ff06",
        "0x7d7652c685e9fda4fe2e41bad017519cffeed8ba03d59aa6401284be2ec4244c"
      ],
      "noMerge": false
    }]
  }'
```

{% endtab %}
{% endtabs %}

### Response Example

```json
{
 "jsonrpc":"2.0",
 "id":"1",
 "result":"0xa06b……f7e8ec"  //bundle hash
}‍
```

```json
{
  "jsonrpc":"2.0",
  "id":"1",
  "error":{
    "code":-38000,
    "message":"the maxBlockNumber should not be smaller than currentBlockNum"
    }
}
```


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