Ethereum <> Polygon Bridge

Polygon Bounty 1 - What is the volume of ETH and a stable coin of your choice that's moved between the Polygon network and the Ethereum network across the bridge? How has that changed over time?

These proxy contracts are :

RootChainManagerProxy - 0xA0c68C638235ee32657e8f720a23ceC1bFc77C77
ERC20PredicateProxy - 0x40ec5B33f54e0E8A33A975908C5BA1c14e5BbbDf

Thus tracking the events emitted by and functions called on these contracts, one could track the POS bridge activity between Ethereum and Polygon sidechain. However usually proxy contracts handle these transactions, so one must actually track these proxy addresses for proper and complete data.

RootChainManager - 0xD4888faB8bd39A663B63161F5eE1Eae31a25B653
ERC20Predicate - 0xC760DefB87E5194E62b282c2a76CBCe4766d7345

Contracts deployed

Depositing ERC20 -

Approve ERC20Predicate contract to spend the tokens that have to be deposited.
Make depositFor call on RootChainManager.

Withdrawing ERC20 -

Burn tokens on matic chain.
Call exit function on RootChainManager to submit proof of burn transaction. This call can be made after checkpoint is submitted for the block containing burn transaction.

ERC-20 transfers

Depositing Ether -

Make depositEtherFor call on RootChainManager and send the required ether.

Withdrawing Ether -

Burn tokens on matic chain.
Call exit function on RootChainManager to submit proof of burn transaction. This call can be made after checkpoint is submitted for the block containing burn transaction.

ETH transfers

In order to retrieve the bridge activity data, we must understand the working behind the ETH-Polygon bridge.

An interesting insight

The first major increase in volume occurs on April 14. This was the date of AAVE protocol annnouncing the $40 Million Liquidity Mining Program

In the below plot, the top half shows daily volume of USDT tranfers from Ethereum into Polygon sidechain, while the bottom half shows the daily volume of transfers from Polygon sidechain back to Ethereum

In the below plot, the top half shows daily volume of ETH tranfers from Ethereum into Polygon sidechain, while the bottom half shows the daily volume of transfers from Polygon sidechain back to Ethereum

flipside