# API Versioning

When backwards-incompatible changes are made to the API, a new dated version is released. See the [changelog](/connect/changelog.md) for available versions and what changed in each.

Requests that omit a version fall back to your organization's pinned version.

## Base URL[​](#base-url "Direct link to Base URL")

All Connect Server APIs use:

```
https://<region>.api.nabla.com/v1/connect/server
```

`<region>` is `us` or `eu`.

## Targeting a specific version[​](#targeting-a-specific-version "Direct link to Targeting a specific version")

### Via header (recommended)[​](#via-header-recommended "Direct link to Via header (recommended)")

Add the `X-Nabla-Api-Version` header:

```
curl https://us.api.nabla.com/v1/connect/server/{endpoint} \

  -H "X-Nabla-Api-Version: 2026-04-24"
```

### Via query parameter[​](#via-query-parameter "Direct link to Via query parameter")

Alternatively, use `nabla-api-version`:

```
curl https://us.api.nabla.com/v1/connect/server/{endpoint}?nabla-api-version=2026-04-24
```