post https://api.stake.fish/api/v1/chains/sui/transactions/prepare/undelegate
Prepare an unsigned transaction to unstake SUI tokens and stop earning rewards.
Important Notes: • Undelegation requires the stake object ID from previous delegation • There is no unbonding period - undelegated SUI is immediately available • Gas fees are paid in SUI from the sender's address • Rewards are automatically included in the undelegated amount