> For the complete documentation index, see [llms.txt](https://flapjax.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://flapjax.gitbook.io/docs/hosting/cost-optimisation/markdown.md).

# Spot Instances

Spot Instances offer EC2 compute capacity at discounts up to 90%.

Why Use Spot Instances

Great for stateless, interruptible, fault-tolerant workloads.

### Use Cases

* Queue workers
* Event processors
* Autoscaled frontend nodes
* Non‑critical batch jobs

### When NOT to Use Spot

* Databases
* Stateful or mission‑critical workloads

### How Flapjax Uses Spot

Flapjax supports mixed On‑Demand + Spot node groups in EKS for safe optimisation.

### Summary

Spot instances provide massive savings when used for suitable workloads.