Sun

The Beanstalk peg maintenance mechanism requires a protocol-native timekeeping mechanism and regular code execution on Arbitrum. The Sun keeps time on the Farm in Seasons and incentivizes cost-efficient and timely calling of the gm function.

Beanstalk adjusts itself to return the Bean price to its value peg at the beginning of every Season. Each Season is ~1 hour long. The first Season began when Beanstalk was deployed on August 6, 2021 (initially on Ethereum).

The exact beginning of each Season may vary as Seasons do not begin until the gm function has been called through an Arbitrum transaction. The first transaction that successfully calls the gm function after the top of each hour UTC begins a new Season. Beanstalk only accepts one gm function call per Season.

Beanstalk covers the cost of calling the gm function by awarding the sender of an accepted gm function call with newly minted Beans. To encourage regular gm function calls even during periods of congestion on Arbitrum while minimizing cost, the award for successfully calling the gm function starts at 1 Bean and compounds 1.0201% every additional 2 seconds for 300 seconds.

Upon acceptance of the gm call, the Sun:

Increments the Season number;
Calculates deltaB, the sum of the time-weighted average shortages or excesses Beans across liquidity pools on the Minting Whitelist;
Changes the Maximum Temperature if necessary and checks for Flood;
Changes the Crop Ratio (and updates the Gauge Points of each whitelisted asset);
Sets the initial Soil supply;
Mints Beans if necessary; and
Awards Beans to the address that successfully called the gm function.

Minting Whitelist

To be included in the calculation of deltaB, a liquidity pool must be on the Minting Whitelist.

Additional liquidity pools may be added to the Minting Whitelist via Beanstalk governance. In order for a liquidity pool to be added to the Minting Whitelist, Beanstalk requires: