Problem

Beanstalk is currently overpaying for Sunrise function calls. We propose changing the base incentive for Farmers to call the Sunrise function

Proposed Solution

gasUsed = min(deltaGas + GAS_OVERHEAD, MAX_SUNRISE_GAS)
gasFee = blockBaseGasFee + PRIORITY_FEE_BUFFER

sunriseReward = max(min(gasFee * gasUsed * beanEtherPrice + BASE_REWARD, MAX_REWARD), MIN_PAYOUT)

Where:

• deltaGas-> delta of gasleft() at the start and end of transaction
• GAS_OVERHEAD → Estimated gas overhead not included in deltaGas. Equal to 21k plus gas cost of paying caller
• MAX_SUNRISE_GAS -> manipulation protection parameter. Determine the maximum possible gas cost of performing a Sunrise call (Probs when SOP occurs)
• blockBaseGasFee -> block.basefeegasUsed
• PRIORITY_FEE_BUFFER -> Overestimation of maximum required priorityFee to call sunrise() transactions. (We can access the baseGasFee but not the priorityFee in Solidity). Maybe start at 5?
• beanEtherPrice -> 2 options:
  1. Use Bean:3Crv pool and USD:Ether price
  2. Use Aqueduct to fetch Bean:Ether price from Bean:Ether Well (Requires on release of Wells, Pumps and Aqueduct)
• MAX_REWARD → A max base reward to prevent manipulation (Probs =100 Beans as that is what it is now)
• BASE_REWARD → A fixed increase in Bean reward to cover costs of operating sunrise() bots.
• MIN_REWARD → The minimum reward to payout.

Rationale

This solution seeks the mathematically minimize the number of Beans that Beanstalk needs to pay for the sunrise() call.

The cost to execute a sunrise() transaction in Beans is:

gasUsed * (baseGasFee + priorityFee) * beanEthPrice

This solution computes an on-chain estimation of the above formula function while adding sufficient tunable parameters to properly account for estimation error and potential manipulation.