# Experimental Features API This API allows a server administrator to enable or disable some experimental features on a per-user basis. The currently supported features are: - [MSC3881](https://github.com/matrix-org/matrix-spec-proposals/pull/3881): enable remotely toggling push notifications for another client - [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575): enable experimental sliding sync support - [MSC4222](https://github.com/matrix-org/matrix-spec-proposals/pull/4222): adding `state_after` to sync v2 To use it, you will need to authenticate by providing an `access_token` for a server admin: see [Admin API](../usage/administration/admin_api/). ## Enabling/Disabling Features This API allows a server administrator to enable experimental features for a given user. The request must provide a body containing the user id and listing the features to enable/disable in the following format: ```json { "features": { "msc3026":true, "msc3881":true } } ``` where true is used to enable the feature, and false is used to disable the feature. The API is: ``` PUT /_synapse/admin/v1/experimental_features/ ``` ## Listing Enabled Features To list which features are enabled/disabled for a given user send a request to the following API: ``` GET /_synapse/admin/v1/experimental_features/ ``` It will return a list of possible features and indicate whether they are enabled or disabled for the user like so: ```json { "features": { "msc3026": true, "msc3881": false, "msc3967": false } } ```