Rewards Distributors

Pool owners may register and remove rewards distributors from the vaults in their pools. Rewards distributors are smart contracts which can distribute rewards among all of the liquidity positions in a specified vault (instantaneously or over time) and allow these rewards to be collected.

Creating a Rewards Distributor​

Reward distributors must conform to the IRewardDistributor interface. This includes a payout function which should transfer amount of rewards to the sender address:

function payout(uint128 accountId, uint128 poolId, address collateralType, address sender, uint amount) external returns (bool);

For security reasons, the payout function should always revert unless msg.sender is equal to Synthetix Core address.

A pool owner can then connect a rewards distributor to a vault with the registerRewardsDistributor function. (Note that due to gas considerations, no more than 10 rewards distributors may be connected to a given vault at time.) To remove a rewards distributor, the pool owner can call the removeRewardsDistributor function.

Rewards Distributor Example

Below is an example Rewards Distributor contract that can be used to develop your own.

Below is an example transaction that:

1. Registers a Rewards Distributor contract

2. to poolId 69

3. with SNX (on Optimism Goerli)

https://goerli-optimism.etherscan.io/tx/0xcbc66ab9276aa828149cabbe40c7eb88408d9963664ac37f9f69c4f228a7811egoerli-optimism.etherscan.io

Distributing Rewards

A registered rewards distributor can call the distributeRewards function. The poolId and collateralType parameters identify the relevant vault. amount indicates the total amount of tokens to be distributed starting at the start timestamp over duration seconds. Note that duration may be set to 0, such that the rewards are distributed instantaneously based on the pro-rata distribution at start. A rewards distributor can call the distributeRewards function multiple times, adding to the rewards already distributed to those participating in the vault.

Anyone can static call the claimRewards function to see what an account ID can claim from a distributor registered to a specified vault, accounting for amounts previously claimed. Then, an address that owns (or has relevant permissions on) that account can call the claimRewards function. This, in turn, calls the payout function on the rewards distributor with the appropriate amount.