---
title: "STACKIT PubSub"
description: "Scalable event-driven messaging service providing publish/pull topic patterns with at-least-once delivery."
scfAsset:
  category: "service"
  managed: true
  marketplaceUrl: "https://marketplace.stackit.cloud/en/products"
  tags: ["PubSub", "Messaging", "Event-Driven", "Kafka", "Topics"]
  maintainers:
    - user: "alexander.gabert"
source_url: "https://framework.stackit.cloud/architecture/assetcontainer/stackit/stackit-service-pubsub/"
source_file: "docs/architecture/assetcontainer/stackit/stackit-service-pubsub.mdx"
---

STACKIT PubSub enables real-time asynchronous messaging between microservices.

## Service Overview
- **Event-Driven Architecture**: Decouples microservices through scalable publish/pull topic messaging.
- **Pay-Per-Use**: Billing based strictly on consumed message volume without fixed monthly base fees.
- **No Lock-In**: SDK abstractions enable easy migration and integration.

## Technical Details
- **Specs**: Supports messages up to 8 MB and retains unconsumed messages up to 7 days.
- **Delivery**: Guarantees at-least-once message delivery semantics.

## Limitations & Constraints
- **Single Region**: Currently operates within single cloud regions (multi-region replication in roadmap).

<LinkCard title="STACKIT PubSub Documentation" href="https://docs.stackit.cloud" />