> For the complete documentation index, see [llms.txt](https://docs.rallyprotocol.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rallyprotocol.com/unity/gasless-transactions/deploy-a-contract-gaslessly.md).

# Deploy a contract gaslessly

{% hint style="info" %}
An API key is required to use the infrastructure to power gasless transactions. Visit  <https://app.rallyprotocol.com/> to generate both Amoy and Mainnet Polygon API keys.&#x20;
{% endhint %}

## Deploy contracts with the relay method

To gaslessly deploy a contract, create a [GSN transaction object](https://github.com/rally-dfs/rly-network-mobile-sdk/blob/736e1de0859bec5230abba80e978f76f43fe2123/src/gsnClient/utils.ts#L16)  and use the `relay()` method to send the transaction to our relayer.

```csharp
var gsnTx = new GsnTransactionDetails(
  from: accountAddress,
  data: tx.data,
  value: "0",
  to: contractAddress,
  gas: gas.ToString(),
  maxFeePerGas: maxFeePerGas.ToString(),
  maxPriorityFeePerGas: maxPriorityFeePerGas.ToString(),
);

await amoy.Relay(gsnTx)


// relay arbitrary tx through our gasless relayer. see a complete Flutter example at
// https://github.com/rally-dfs/flutter-example-app/tree/main/app/lib/services/nft.dart
```


---

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