Amazon's Kindle Direct Publishing (KDP) is a fast, easy and free way for authors and publishers to keep control and publish their books worldwide on the Kindle and Kindle reading apps.
KDP select allows you to choose between two royalty options for each title you publish—35% or 70%. KDP pays royalties based on the price you set for your book, minus delivery costs Amazon incurs.
To publish your book on Kindle, you can Enroll your book in KDP select and Earn royalties from borrows from Kindle Unlimited or the Kindle Owners' Lending Library. You can also promote your book through KDP select's Countdown Deals and Free Book Promotions.
KDP pays royalties every month, approximately 60 days after the end of the month in which the borrow or sale occurred.