---
title: Custom Payload (clientbound)
description: "Play 0x18, server → client."
---

`play` · `0x18` · **clientbound** (server → client)

Sends a plugin message on the named `channel` with raw `data`. Vanilla uses it for channels such as `minecraft:brand`, and mods and servers use it for custom communication. The client ignores channels it does not recognize.

Sent by the server, read by the client. Listen for it with `client.on("CustomPayload", (data) => …)` on the receiving side.

## Fields

| Field | Type | Notes |
|---|---|---|
| `channel` | String |  |
| `data` | Byte[] |  |

## Send it

```ts
await client.sendPacket("CustomPayload", {
  channel: /* String */,
  data: /* Byte[] */,
});
```

Field aliases listed under Notes are accepted as alternative keys when writing.

Source: [`src/Core/Versions/776/Packets/play/clientbound/CustomPayload.ts`](https://github.com/GDLev/mc-protocol/blob/master/src/Core/Versions/776/Packets/play/clientbound/CustomPayload.ts)