> For the complete documentation index, see [llms.txt](https://docs.os.uk/os-apis/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/os-apis/core-concepts/rate-limiting-policy.md).

# Rate-limiting policy

The OS Data Hub implements rate limiting to maintain the reliability and efficiency of our services. The rate limiting rules differ between live-mode project, development-mode projects, and our OS Places API Partner trial.

### **Live-mode projects**

* **Limit**: 600 transactions per minute.
* **Scope**: The limit is applied per API and per individual project in the live-mode projects.
* **Implication**: This means that each API in your live project can perform up to 600 transactions per minute.

### **Development-mode projects**

* **Limit**: 50 transactions per minute.
* **Scope**: This limit is enforced per API and per project in the development (dev) environment.
* **Implication**: Each API within your development-mode project can handle a maximum of 50 transactions per minute.

### OS Places API Partner trial

* **Limit:** 50 transactions per minute.
* **Scope:** This limit is enforced for the duration of the OS Places API Partner trial and applies to all projects with an OS Places API Key across an account.
* **Implication:** Each OS Places API Key within your account can handle a maximum of 50 transactions per minute.

{% hint style="warning" %}

#### Exceeding the rate limit

If the rate limit for an API is exceeded, subsequent requests will be rejected (429) until the rate falls below the allowed threshold. It's important to design your application to handle these errors gracefully.
{% endhint %}


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