# Service metadata

{% hint style="warning" %}

### API test authentication

The Open API block allows you to test OS APIs directly from the page with example data and parameters. To use this feature, you will need to add your API Key or OAuth2 token to the authentication field.

For help generating an API Key or OAuth2 token, please see the [Getting started with an API project](https://docs.os.uk/os-apis/core-concepts/getting-started-with-an-api-project) or [OAuth2 documentation](https://docs.os.uk/os-apis/accessing-os-apis/oauth-2-api).
{% endhint %}

## GET /vts

> Service Metadata for OS Vector Tiles API

```json
{"openapi":"3.0.1","info":{"title":"OS Vector Tiles API","version":"v1.0"},"tags":[{"name":"Service Metadata","description":"Service Metadata for OS Vector Tiles API"}],"servers":[{"url":"https://api.os.uk/maps/vector/v1"}],"security":[{"api-key":[],"api-key-header":[],"oauth2":[]}],"components":{"securitySchemes":{"api-key":{"type":"apiKey","name":"key","in":"query"}},"schemas":{"ServiceMetadata":{"type":"object","properties":{"currentVersion":{"type":"number"},"name":{"type":"string"},"capabilities":{"type":"string"},"type":{"type":"string"},"defaultStyles":{"type":"string"},"tiles":{"type":"array","items":{"type":"string"}},"exportTilesAllowed":{"type":"boolean"},"initialExtent":{"$ref":"#/components/schemas/Extent"},"fullExtent":{"$ref":"#/components/schemas/Extent"},"minScale":{"type":"number"},"maxScale":{"type":"number"},"tileInfo":{"$ref":"#/components/schemas/TileInfo"},"maxzoom":{"type":"integer"},"minLOD":{"type":"integer"},"maxLOD":{"type":"integer"},"resourceInfo":{"type":"object","properties":{"styleVersion":{"type":"integer"},"tileCompression":{"type":"string"},"cacheInfo":{"type":"object","properties":{"storageInfo":{"type":"object","properties":{"packetSize":{"type":"integer"},"storageFormat":{"type":"string"}}}}}}},"serviceItemId":{"type":"string"},"maxExportTilesCount":{"type":"integer"}}},"Extent":{"type":"object","properties":{"xmin":{"type":"number"},"ymin":{"type":"number"},"xmax":{"type":"number"},"ymax":{"type":"number"},"spatialReference":{"type":"object","properties":{"wkid":{"type":"integer"},"latestWkid":{"type":"integer"}}}}},"TileInfo":{"type":"object","properties":{"rows":{"type":"integer"},"cols":{"type":"integer"},"dpi":{"type":"integer"},"format":{"type":"string"},"origin":{"type":"object","properties":{"x":{"type":"number"},"y":{"type":"number"}}},"spatialReference":{"$ref":"#/components/schemas/Extent"},"lods":{"type":"array","items":{"$ref":"#/components/schemas/Lod"}}}},"Lod":{"type":"object","properties":{"level":{"type":"integer"},"resolution":{"type":"number"},"scale":{"type":"number"}}}}},"paths":{"/vts":{"get":{"tags":["Service Metadata"],"summary":"Service Metadata for OS Vector Tiles API","operationId":"getServiceMetadata","parameters":[{"name":"srs","in":"query","description":"The Spatial Reference System for the service.","required":false,"schema":{"type":"string","default":"27700","enum":["27700","3857"]}}],"responses":{"200":{"description":"Retrieves Service Metadata for OS Vector Tiles API","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ServiceMetadata"}}}}}}}}}
```