> For the complete documentation index, see [llms.txt](https://docs.xyb.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.xyb.co/accounts/kafka-topics-quick-reference-guide.md).

# Kafka Topics Quick Reference Guide

Kafka topics enable event-driven communication across the XYB platform. Subscribe to these to receive real-time updates about account creation, balance changes, and lifecycle transitions.

#### **Informational Topics (Produced by XYB Accounts)**

| **Topic Name**                       | **Event Type**   | **Purpose**                                                       |
| ------------------------------------ | ---------------- | ----------------------------------------------------------------- |
| `info.cac.account.account.v1`        | Info Broadcast   | Emits full account payload when an account is created or updated. |
| `info.cac.account.balance-update.v1` | Info Broadcast   | Notifies downstream services of wallet balance updates.           |
| `info.cac.account.create-result.v1`  | Operation Result | Response after an account creation command is processed.          |
| `info.cac.account.status-change.v1`  | Lifecycle Event  | Signals a change in account status (e.g., Open → Suspended).      |
| `info.cac.account.status-result.v1`  | Operation Result | Acknowledgement or result from a status change command.           |

***

#### **Operational Topics (Listen to these to trigger workflows)**

| **Topic Name**                       | **Event Type** | **Use Case**                                                                |
| ------------------------------------ | -------------- | --------------------------------------------------------------------------- |
| `oper.cac.account.create-command.v1` | Action Command | Send this message to initiate account creation via event-driven onboarding. |
| `oper.cac.account.status-command.v1` | Action Command | Trigger a lifecycle state change (e.g., Suspend an account).                |

***

### **Best Practices**

* **Subscribe to `info.cac.account.*`** topics to keep downstream systems (e.g., CRMs, reporting tools, risk engines) in sync.
* **Use `oper.*` topics** only if you’re implementing an async orchestration layer or workflow that doesn’t rely on REST APIs.
* **Use `create-result` and `status-result`** topics to confirm command success and trigger dependent actions.

***


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