Video Guide: What is Spread Betting

No youtube playlist videos to be found - maybe API key not set ? This is the feed - https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&playlistId=PL03BCAE4FB8C513C8&key=AIzaSyCtrnD7ll8wyyro5f1LitPggaSKvYFIvU4&maxResults=50
The request cannot be completed because you have exceeded your quota.