> For the complete documentation index, see [llms.txt](https://docs.xyo.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.xyo.network/developers/cookbook/submit-and-retrieve.md).

# Submit and Retrieve a Payload

Submit a payload through an XL1 gateway and retrieve it through typed viewers.

Use a write-capable XL1 gateway for submission and its typed viewer surface for retrieval.

```typescript
import { PayloadBuilder } from '@xyo-network/sdk'
import { GatewayBuilder } from '@xyo-network/xl1-sdk'
```

1. Build and validate the application payload.
2. Obtain a write-capable gateway using a public browser-wallet provider or a server-side `GatewayBuilder` with an application-managed account.
3. Submit through `gateway.addPayloadsToChain(...)`.
4. Retain the returned transaction hash.
5. Retrieve the transaction through `gateway.connection.viewer?.transaction.byHash(hash)`.
6. Validate every application payload body before using it.

{% hint style="danger" %}
Never call raw JSON-RPC method names and never use Ethereum RPC methods against XL1. Use the typed gateway and viewer APIs from `@xyo-network/xl1-sdk`.
{% endhint %}


---

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