Rewards CELO

Rewards CELO is a wrapper around wrapper CELO tokens like SavingsCELO. Rewards CELO allows users to earn interest using any interest bearing CELO wrapper they choose.

Usage

npm i
npm run build npm run test

Depositing

pCELO supports depositing any wrapped CELO defined in the wrappedCelos array. Depositing is in units of the wrapped CELO. The amount of pCELO minted is determined by the following ratio:

toMint / pCELO.totalSupply() = savingsToCELO(toDeposit) / totalSupplyCELO

Withdrawing

pCELO forces users to withdraw from every supported wrapped CELO. Withdrawing is in units of pCELO. Every wrapped CELO is withdrawn at a ratio of

toWithdraw / pCELO.totalSupply()

pCELO was designed this way to prevent users from depositing aCELO and withdrawing bCELO.

Benchmarking

Deposit and withdraw each iterate over the list of wrappedCelos. Each added wrappedCelo will make transactions more expensive. This benchmark describes how the gasUsed increases as the number of wrappedCelos increases:

  Contract: RewardsCELO
    wrappedCelos benchmarking
Gas price is 0.1 gwei
Gas used @ 10 wrappedCelos: 119676.
Gas used @ 20 wrappedCelos: 176009.
Gas used @ 30 wrappedCelos: 232344.
Gas used @ 40 wrappedCelos: 288680.
Gas used @ 50 wrappedCelos: 345018.
Gas used @ 60 wrappedCelos: 401358.
Gas used @ 70 wrappedCelos: 457698.
Gas used @ 80 wrappedCelos: 514041.
Gas used @ 90 wrappedCelos: 570385.
Gas used @ 100 wrappedCelos: 626731.

which can roughly be modeled linearly:

y = 5633.3x + 63343

13M gas block limit would support up to 2,296 wrapped CELOs

This can be replicated via:

npm run bench

Contract addresses

Mainnet

RewardsCELO: 0x1a8Dbe5958c597a744Ba51763AbEBD3355996c3e

Alfajores

RewardsCELO: 0xBDeedCDA79BAbc4Eb509aB689895a3054461691e MockWrappedCelo: 0x77287E942993A056E75b849DEB84B33F28dEFada