How to track staking rewards paid out in a specific epoch to a specific delegator of a delegation pool

[jcbrand]

Discord user ID

defi4n+

Describe your question in detail.

Hi, I'm looking for information on how to track staking rewards paid out to delegators of a delegated staking pool (in a specific epoch).

I see that there is a DistributeRewardsEvent in the final transaction of an epoch and this contains the pool_address and the rewards_amount.
So this tells me how many rewards were paid out to the pool, but how can I find out how many rewards accrue to a specific delegator to that pool?

Thanks 🙏

What error, if any, are you getting?

No response

What have you tried or looked at? Or how can we reproduce the error?

I've been looking at transactions with reward payouts in an explorer.

For example:
https://explorer.aptoslabs.com/txn/590484333/events?network=mainnet

Which operating system are you using?

Linux (Ubuntu, Fedora, Windows WSL, etc.)

Which SDK or tool are you using? (if any)

N/A

Describe your environment or tooling in detail

No response

[0x-j]

I found this doc, it might give you some ideas.

I don't have a good solution right now, and i'm asking around.

This thread might also be helpful.

A pretty complex solution I can think of.

import { Aptos, AptosConfig, Network } from "@aptos-labs/ts-sdk";

const config = new AptosConfig({
  network: Network.MAINNET,
});
export const aptos = new Aptos(config);

export const calculateReward = async () =>
  {
    const delegatorAddr =
      "0x42b7cd08d63005d04c8dd0ed5e7e1acab3cf20bf77dab114ba5a2806d0b97be2";
    const poolAddress =
      "0x9bfd93ebaa1efd65515642942a607eeca53a0188c04c21ced646d2f0b9f551e8";

    const [activeStake, inactiveStake, pendingInactiveStake] = await aptos.view(
      {
        payload: {
          function: "0x1::delegation_pool::get_stake",
          typeArguments: [],
          functionArguments: [poolAddress, delegatorAddr],
        },
        options: {
          ledgerVersion: 0, // last ledger version of the epoch
        },
      }
    );

    // find how much APT users staked during each epoch. subtraction gives you reward at each epoch
  };

[buzzlamicjihad]

This was helpful, thank you

[jcbrand]

Thanks @0xaptosj 🙏

I would have preferred a solution that doesn't require us to keep track of how much we've staked per epoch, but looks like it's not possible ATM.

[0x-j]

Yeah unfortunately that's not supported now 😢