# Engine

#### Overview <a href="#overview" id="overview"></a>

Engine is an open-source, backend server that reads, writes, and deploys contracts at production scale.

#### Why use Engine? <a href="#why-use-engine" id="why-use-engine"></a>

Engine enables your app to:

* Send multiple blockchain transactions at once.
* Resubmit stuck transactions, handling nonce values, gas settings, and RPC errors.
* Avoid duplicate transactions.
* Manage multiple backend wallets and their funds.
* Control access from your backends and team members.
* Sponsor user gas fees.
* Deploy and interact with smart accounts.
* Subscribe to contract events and transactions.

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="files"></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td>Engine</td><td>Backend server to reliably call smart contracts</td><td><a href="https://content.gitbook.com/content/neke8a6D4Ybg9dkRA2GD/blobs/hCfKanbPNZrlY0OXbUEC/nav-icon-engine.svg">nav-icon-engine.svg</a></td><td><a href="https://portal.thirdweb.com/engine">https://portal.thirdweb.com/engine</a></td></tr></tbody></table>