What one link gets you
One link, the video you pick. Paste the address of the YouTube video you want watched, and the boost goes to that video alone.
You set the amount. Choose how many views to send, as high as 10,000.
Safe for your account. The views arrive on the video's public address, so no login to your channel is ever asked.
No subscribing back. You never follow strangers' channels to earn a turn, so your own subscriptions stay the ones you chose.
A reason for the algorithm. A fresh video that gathers views sends YouTube a signal to show it to more people.
Where the boost stops
Views are not subscribers.
Whether someone hits Subscribe after watching is still down to your video, its title and its first seconds.
One video per link.
The boost lands on the address you paste. To lift another upload, start again with that video's link.
How it goes
On YouTube, open the video and grab its link from the Share button.
Paste it here and choose how many views it should get.
The views head to that video, and its count starts to climb where YouTube can see it.