Yes — there is a user guide.
0.5 ETH. It means you can stake 0.5, 1.0, 1.5 ETH, but cannot stake, for example, 0.55, 1.1, 1.88 ETH.
No, you can stake at your discretion, unlimited. You should know that currently staking starts once 32 ETH are accumulated, so if your stake is > 32 ETH, it’ll be divided into chunks and the rule will apply to each of them.
Currently, unstaking is not available, as this functionality is not yet supported by Ethereum.
Unstaking will be enabled after in the Shanghai upgrade that will follow The Merge in 6-12 months.
Overall, it looks like Shanghai is going to come in ~Q2/Q3 2023.
Currently, there is no unbonding period, as there is no unstaking for ETH. This functionality is to be implemented by the Ethereum team in future updates.
aETHb is a rebasing token. When holding aETHb, your balance will increase in proportion to your ETH staking rewards. A rebase runs daily, and rewards occur each time this runs. So each day, you will see the quantity of your aETHb increase by a small amount. aETHc is a reward-bearing token, meaning its quantity stays the same from the moment of staking. Instead, it appreciates in value, as the redemption ratio grows because of reward accumulation.
Mind that to pull out your rewards, you’ll need to sell aETHb/aETHc on Ankr DeFi, as Ethereum hasn’t implemented the unstaking functionality yet.
aETHb will increase with every rebase; rebasing occurs daily. aETHc will increase in value only, daily. aETHc rewards are built into the token. Effectively, your rewards accumulate daily as aETHc grows in value to ETH.
ANKR does not charge any service fees for ETH Liquid Staking. However, validators charge a fee deducted from your rewards (Ankr’s validator node charges 10%), representing an indirect cost for liquid staking token holders. Ankr's income comes from running one of the several validator nodes that will be used to stake ETH.
Staking rewards depend mostly on the voting power of the validator node that your stake is delegated to and how much ETH is validated on the network. The less ETH is staked, the higher the rewards to incentivize more ETH to come online, and vice versa. Ankr aims to spread delegations to only the most trustworthy and reliable nodes to increase staking rewards. View the current amount of staked ETH.
The only risk for stakers is missing out on rewards during any time a validator they staked with is slashed. Slashing is a protocol-level penalty associated with a validator failure if it validates an invalid transaction or goes offline. The delegated staked ETH is not slashed — slashing impacts only the self-stake of the validator. Ankr only delegates to trusted and reputable validator nodes to avoid any validator that would act maliciously.
You can trade them in the listed liquidity pools on ANKR DeFi: