> For the complete documentation index, see [llms.txt](https://docs.ethgas.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ethgas.com/orderflow/readme.md).

# Welcome

ETHGas Orderflow Engine accepts private Ethereum transactions, shares safe decoded orderflow with authorized searchers, and forwards eligible transactions and backrun bundles to configured builders.

The engine is designed for two participants:

* **Originators** submit signed transactions or bundles without broadcasting them to the public mempool.
* **Searchers** receive unsigned decoded orderflow and submit backruns.

## Start here

* New integrators: follow the [Quickstart](/orderflow/quickstart.md).
* Sending orderflow: read [Originators](/orderflow/originators.md).
* Building backruns: read [Searchers](/orderflow/searchers.md).

{% hint style="info" %}
The engine admits structurally valid signed transactions; it does not simulate them or guarantee on-chain inclusion. Final acceptance is determined by the configured builders.
{% endhint %}


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