Polkadot allows you to stake your DOT tokens directly on their blockchain to earn ~14% APR interest.
Annual percentage rate can fluctuate on a variety of factors and is provided only as a current estimate. The most common way to stake your crypto on the Polkadot blockchain is to stake your DOT as a nominator. Interest payouts are distributed to stakers once per day.
Relevant resources & tutorials to assist you:
For those seeking a less technical Polkadot staking solution, Kraken offers a 12% APR to stake on their platform. But bear in mind that Kraken is a custodial exchange in which you do not hold the private key for your crypto. Learn the differences about staking your DOT on Kraken vs directly on the Polkadot blockchain.