Question:

• What is the volume of ETH and three stablecoins of your choice that's moved between the Optimism network and the Ethereum network across the bridge?
• How has that changed over time?

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Methodology:

In this bounty, asked us to find the flow moved between the Optimism network and the Ethereum network by ETH token and three desired stablecoins.

In all the following sentences, inflow means the flow from the Ethereum network to Optimism, and outflow means the flow from the Optimism network to Ethereum.

So, first, I will state the limitations that I considered to answer this question.

1. To find the inflow and outflow, I considered two famous bridges of Optimism network, i.e. native bridge and hop bridge. That is, I only include the input and output of these two bridges in my calculations.
2. The stablecoins I chose to review are USDC, USDT, and DIA.

but before deep dive into calculation inflow and outflow, let’s talk about how to find this transactions. for bridge info i choose two bridge : 1. Native Optimism bridge and 2. Hop Bridge.

• Native Bridge
  • to find bridge transaction first find bridge smart contract then we know all fund that want to bridge should send to that smart contract on Ethereum and all fund that bridged from Optimism to Ethereum should be distributed with this address.with this way we don’t need even know transactions on Optimism and just query inflow and outflow this address know all bridge transaction
• Hop Bridge

  • at first look seems Hop bridge should be same as native bridge but Hop has two main difference : one is Hop use diffrent smart contract for diffrent tokens and second Hop bridge fund in diffenrent blockchain. for first problem i find these addresses with help of Hop Bridge documents.second problem but need a bit work. for all bridge transaction in hop there is an event that in the event specify destination chain id. all EVM compatible chains has chain id that unique for that chain for example Optimism has chain id 10. so all transaction with Hop bridge smart contract and destination chain id 10 are inflow bridge to Optimism.for outflow we should know Ethereum chain id is 1 and with TOPICS[2]='0x0000000000000000000000000000000000000000000000000000000000000001' can find bridge with destination ethereum

Conclusion:

• In all metrics (both inflow and outflow), including tx count, unique users, and volume native Bridge is superior to Hop Bridge.
• Although the number of Bridge ETH transactions is more than USDC and other stable coins, the volume of USDC transactions is more than ETH and others.
• Jun 1st has the highest unique users and tx count of inflow and outflow and Aug 4th has highest volume in both bridges.

In these charts, you can see the tx count of outflow per asset that exits from the Optimism network through each of the bridges.

• The tx count exits from Optimism through native bridge is more than Hop bridge.
• The peak of tx count transferred through native bridge was on Jun 1st that 5300 asset transactions sent to Ethereum. The peak through Hop bridge was Jun 1st too.
• Between these four assets ETH is most popular one among people used both bridges based on tx count from Optimism to Ethereum.

Daily inflow:

Total inflow and outflow:

In these charts, you can see the volume of inflow per asset that enters the Optimism network through each of the bridges.

• The volume enter to Optimism through native bridge is much more than Hop bridge.
• The peak of volume transferred through native bridge was on Aug 4th that entered more than 104M dollars ETH to Optimism while the peak through Hop bridge was Jun 1st that enter around 5M dollars ETH to this network.
• Between these four assets USDC is most popular one among people used native bridge and ETH is most popular one among who used Hop bridge but totally based on volume USDC is the most popular asset for bridging from Ethereum to Optimism.

In these charts, you can see the daily unique user who used native bridge or Hop for transferring their assets from Ethereum to Optimism network.

• The number of native bridge users s much more than Hop bridge.
• The peak of volume transferred through native bridge was on Aug 4th that entered more than 104M dollars ETH to Optimism while the peak through Hop bridge was Jun 1st that enter around 5M dollars ETH to this network.

In these charts, you can see the tx count of inflow per asset that enters the Optimism network through each of the bridges.

• The tx count to Optimism through native bridge is more than Hop bridge.
• The peak of tx count transferred through native bridge was on Jun 1st that more than 5K ETH transactions sent to Optimism. The peak through Hop bridge was Jun 1st too.
• Between these four assets ETH is most popular one among people used both bridges based on tx count from Ethereum to Optimism.

Daily outflow:

In these charts, you can see the volume of outflow per asset that exits from Optimism network through each of the bridges.

• The volume exits from Optimism through native bridge is much more than Hop bridge.
• The peak of volume transferred through native bridge was on Aug 5th that exited more than 81M dollars USDC and 100M ETH from Optimism while the peak through Hop bridge was Jul 1th that exits around 4M ETH and 3.5M dollars USDC from this network.
• Between these four assets USDC is most popular one among people used both bridges for bridging from Optimism to Ethereum.

In these charts, you can see the daily unique user who used native bridge or Hop for transferring their assets from Optimism to Ethereum network.

• The number of Native bridge users is more than Hop bridge.
• The peak of number of users transferred their assets through native bridge was on Jun 1st that around 5000 unique users transferred their assets to Ethereum. The peak through Hop bridge was Jun 1st too.
• The most popular assets to transferring to Ethereum through both bridge is ETH (based of TX count).

Total inflow and outflow comparison shows us:

• In all metrics (both inflow and outflow), including tx count, unique users, and volume native Bridge is superior to Hop Bridge.
• Although the number of Bridge ETH transactions is more than USDC and other stable coins, the volume of USDC transactions is more than ETH and others.
• seems USDC is most used stablecoin among these three.
• while DAI is stablecoin based of Ethereum network and used for DeFi but in Optimism don’t have special place and seems other stablecoins like LUSD (not in this selection) more used than DAI.
• while seems outflow and inflow these two birdge are same pattern and look but we see overall outflow is i bit higher than inflow