> 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/tc/transaction-submission/transaction-sending/ethereum.md).

# Ethereum Transaction Sending

### 什麼是 Broadcast Tx

Broadcast Tx 是 BlockRazor 提供的一種快速交易發送服務，用於幫助用戶以更低延遲將交易發送到鏈上。它屬於 Fast 體系的一部分，但與需要在交易中附加 tip 的標準 Fast 模式不同，Broadcast Tx 不要求用戶在交易內部額外支付 tip，因此更適合作為低門檻的快速發送入口使用。

目前Ethereum Broadcast Tx提供 `SendTx` 方法，用来發送单笔交易。

需要注意的是，Broadcast Tx 雖然屬於 Fast 體系，但它並不等同於具備完整交易保護能力的私有發送通道。Broadcast Tx 發送的交易會進入公開傳播路徑，因此不具備 MEV 防護能力。

### 什麼場景下選擇 Broadcast Tx

* **不需要 tip，接入門檻更低**\
  與標準 Fast 模式不同，Broadcast Tx 不要求在交易中附加 tip，因此更適合希望快速接入、但不想修改交易激勵結構的用戶。
* **適合對速度有要求、但暫不強調 MEV 防護的場景**\
  如果你的重點是盡量更快地把交易發出去，而不是通過私有路徑隱藏交易或抵御 sandwich、frontrunning 等風險，那麼 Broadcast Tx 會是一個更直接的選擇。

### 價格

<table><thead><tr><th width="153.44921875">用戶類型</th><th>限流</th><th>價格</th></tr></thead><tbody><tr><td>新註冊用戶</td><td><p><code>SendTx</code></p><ul><li>TPS：10 Txs / 5s</li><li>每日交易上限：10</li></ul></td><td>免費</td></tr><tr><td>付費用戶</td><td><p><code>SendTx</code></p><ul><li>TPS：100 Txs / 5s</li><li>每日交易上限：100000</li></ul></td><td>$50 / 日<br>$500 / 月<br><br><a href="https://blockrazor.io/#/login?redirect=pricing&#x26;purchaseMode=personalized&#x26;chain=ethereum&#x26;serviceId=ethereum_fast_tx&#x26;billing=day" class="button primary small">訂閱</a></td></tr></tbody></table>


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.blockrazor.io/tc/transaction-submission/transaction-sending/ethereum.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.