How to check if YouTube channel is streaming live

I can't find any informations to check if a YouTube channel is actually streaming or not. With Twitch you just need the channel name, and with the API you can check if there is a live or not.

I don't want to use OAuth, normally a public API key is enough. Like checking the videos of a channel I want to know if the channel is streaming.

You can do this by using search.list and specifying the channel ID, setting the type to video, and setting eventType to live.

For example, when I searched for:

https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UCXswCcAMb5bvEUIDEzXFGYg&type=video&eventType=live&key=[API_KEY]

I got the following:

{
 "kind": "youtube#searchListResponse",
 "etag": "\"sGDdEsjSJ_SnACpEvVQ6MtTzkrI/gE5P_aKHWIIc6YSpRcOE57lf9oE\"",
 "pageInfo": {
  "totalResults": 1,
  "resultsPerPage": 5
 },
 "items": [
  {
   "kind": "youtube#searchResult",
   "etag": "\"sGDdEsjSJ_SnACpEvVQ6MtTzkrI/H-6Tm7-JewZC0-CW4ALwOiq9wjs\"",
   "id": {
    "kind": "youtube#video",
    "videoId": "W4HL6h-ZSws"
   },
   "snippet": {
    "publishedAt": "2015-09-08T11:46:23.000Z",
    "channelId": "UCXswCcAMb5bvEUIDEzXFGYg",
    "title": "Borussia Dortmund vs St. Pauli 1-0 Live Stream",
    "description": "Borussia Dortmund vs St. Pauli Live Stream Friendly Match.",
    "thumbnails": {
     "default": {
      "url": "https://i.ytimg.com/vi/W4HL6h-ZSws/default.jpg"
     },
     "medium": {
      "url": "https://i.ytimg.com/vi/W4HL6h-ZSws/mqdefault.jpg"
     },
     "high": {
      "url": "https://i.ytimg.com/vi/W4HL6h-ZSws/hqdefault.jpg"
     }
    },
    "channelTitle": "",
    "liveBroadcastContent": "live"
   }
  }
 ]
}