From Amazon:
If you enroll your eBook in KDP Select, you’re eligible for the KDP Select All-Star Bonus. In addition to paying royalties from the KDP Select Global Fund, each month we award All-Star bonuses to books and authors that are read the most in Kindle Unlimited (KU) and the Kindle Owners’ Lending Library (KOLL). All-Star recipients are also eligible for All-Star badges on their book detail pages. Anyone with titles in KDP Select—even a brand-new author—is eligible.
We award All-Star bonuses to authors and titles that provide our customers the best reading experience based on how much they’re read in KU and KOLL. Authors who publish books together are considered a single “author” for the purposes of KDP All-Star bonuses. We email the award winners.
. . . .
KDP Select All-Star bonuses by marketplace
Amazon.com
| Author ranking | Bonus amount |
|---|---|
| 1-10 | $25,000 |
| 11-20 | $10,000 |
| 21-30 | $5,000 |
| 31-50 | $2,500 |
| 51-100 | $1,000 |
| Title ranking | Bonus amount |
|---|---|
| 1-10 | $2,500 |
| 11-50 | $1,000 |
| 51-100 | $500 |
Link to the rest at Amazon KDP Select Bonuses
PG notes that there are separate KDP All-Star sites with bonuses for Amazon UK and Amazon DE plus Illustrated Kids Book bonuses at the link.