Note about Spotify monthly listeners: Spotify uses 28 rolling days (4 weeks of 7 days) to measure a month. It makes sense as the number of days in a month varies from 28 to 31, and people’s behavior depends more on the days of the week than on dates within a single month. This way, there is always an equal number of each day within the 28 rolling day ‘monthly listener’ stats.
We update the global monthly listeners stat each day. Once a week, the endpoint also returns Spotify's "Where people listen" stats, showing the top 50 cities for monthly listeners.
>The API response may not return a value for all dates, as we may miss a day or two. These data points may still show on our UI because we are interpolating the missing data between two points.
Note about YouTube views: YouTube's view count is calculated by combining each official version of a song, including the official music video, user-generated content that uses the official song, and lyric videos.
Disclaimer: YouTube doesn't aggregate views for all artists on charts.youtube.com, only for a portion of them.
If you want us to start tracking artists' views data across all channels featuring their music, use the “Add artist link” endpoint to submit a new source. The URL structure should look like this: https://charts.youtube.com/artist/slug.
Don't know the artist UUID yet? Use the Get artist by platform ID or Search artist by name endpoints.