NBX takes 10% of the rewards yield to shoulder costs as a custodian.

In Cardano, the delegator does not need to do any form of active work for rewards after delegating. As long as the staking pool is producing blocks, rewards will accrue over time. NBX operates the staking pool for delegations from our customers, and carefully monitors pool performance to get optimal rewards.

Yes. This is because the rewards are on a separate account. When you claim your rewards, they are transferred to your NBX account, and you are free to use your ADA.

No, staking rewards are automatically staked by the protocol so you automatically get a compounding effect. 

The reserve pot is the difference between the hard limit of 45 billion ADA and the current circulating supply. On 3rd of october 2017 the reserve pot was around 20.7 billion ADA. At the end of May 2022 the reserve pot was around 11.2 billion ADA. Every epoch currently at the time of writing 0.3% of the reserve is used for rewards.

Rewards come from fees on the network as well as inflation caused by adding rewards from a reserve pot. Cardano is reducing its inflation rate yearly, while fees are becoming an increasing source of rewards.

After your staked ADA has generated rewards you will be able to claim these on the Cardano staking app. Claiming rewards will incur a transaction fee, as funds are moved from the staking rewards account to your balance at NBX.

The staking pool of NBX has historically had an average yearly reward to delegators of over 4% but this has dropped gradually in 2023 and at the start of 2024 the yield is expected to be around 3%. The annual rewards will vary depending on many variables such as on how much ADA is delegated to the staking pool. Over time, rewards are likely to be somewhere around 3% annually as of current data. You can read more about rewards estimates here.

Rewards are based on how many blocks a staking pool secures during an epoch. The number of blocks is semi-random, meaning rewards may vary from epoch to epoch.

NBX staking follows the Cardano protocol, which is a 4 epoch process starting the epoch after you register for staking. In the first epoch after staking, a snapshot is taken of the stake amount. In the second epoch, your staked ADA helps to secure the blockchain. In the third epoch, rewards are calculated. Finally, in the fourth epoch, rewards are distributed. This process means that rewards can take up to 20 days the first time you stake. After that, you will be paid rewards every 5 days. You can read more about the delegation cycle here.