How to query rewards of a specific KT1 account?

Question

I want to know, how much rewards a specific KT1 Account earned since cycle 7.

A good Example is the "Rewards Share" Tab of TzScan.

https://tzscan.io/tz1Tnjaxk6tbAeC2TmMApPh8UsrEVQvhHvx5?default=rewards

This TzScan API call "unexpectedly" delivers the tz1 Manager Rewards.

https://api6.tzscan.io/v3/delegator_rewards_with_details/KT1BNVf6f359fNbokCKMXuKNmpzUy3Nwugyj

But I need the KT1 Rewards.

Answer 1

Unfortunately there is no way to directly query just the delegator's reward from TzScan API.

But you can easily use this API call with some extra calculations:

//This is what the baker got
var total_reward = rewards + extra_rewards - losses;

//This is the delegator's share in the staking balance
var share = balance / staking_balance;

//This is the delegator's reward (without fee, etc) for the selected cycle
var reward = total_reward * share;

Also, if you don't need the reward details, you might want to use this API call.