BoringDAO oPortal V2.0 is Now Live!

6 min readDec 29, 2021


Since the launch of our oPortal USDT bridge, the amount of USDT circulating through our bridge has exceeded two million US dollars. We currently support nine L1s and three L2s. Especially for the Boba network, a lot of Boba and OolongSwap users choose to bridge their assets through the oPortal. As a result, a lot of liquidity has been gathered on the Boba network.

Our mission is to provide the fastest, safest, and most user friendly cross-chain experience. Hereby we would like to introduce you to the oPortal V2.0 solution, powered by the NEL technology developed by our BoringDAO team.

oPortal V1.0 Can Be Better

In our previous V1.0 design, NEL nodes serve as validators and have been deployed on 12 chains at the same time. It works well if there are only three to five chains, however, when more chains are connected, it becomes difficult to maintain the consistency of information on twelve chains in a timely manner. This is not an easy task even with a centralized solution.

For example, if you make a transfer from Polygon to BSC, even if you have confirmed that there is sufficient liquidity on BSC at that moment, no one can guarantee that the remaining liquidity on BSC won’t be taken away by others ahead of you within just a few minutes while waiting for your assets to be moved on Polygon. In this case your transaction will get stuck.

If ETH is involved, it would become even worse. If you make a payment and later receive a refund on Ethereum, you may have to pay more than $200 for these transactions, which makes transfer of a small amount of asset between blockchains rather unacceptable.

Moreover, removing liquidity could also be a hassle. In the current 1.0 version, you may have encountered the situation that your assets were withdrawn to several different chains instead of a certain desired one, which is definitely not a user-friendly experience for our LPs. The reason we do that is because we have to search for the remaining liquidity value on each chain one by one to ensure sufficient balance for your withdrawal. Otherwise, your transaction will get stuck, for example if you try to remove liquidity from one specific chain, but it just happens to be used up by someone else, because of the network consistency problem.

To sum up, as a beta version, it works just fine, but can be optimized.

oPortal V1.0

So we came up with the V2.0 solution, still supported by BoringDAO’s NEL technology, which can be much more powerful and easier to use.

I don’t know if any of you have used some centralized exchanges. Their user experience is usually pretty good. For instance, you can deposit USDT in different address formats, and then withdraw to corresponding receiving addresses and networks.

Why can’t we make a decentralized version?

They are using the Amazon servers. Wouldn’t it be better for us to use some rather cheap blockchains as our server? Such as our partner Polygon.

Here we go. oPortal V2.0 solution is NOW LIVE!

Your bridging experience will consist of the following two steps:

Step 1

A relay chain is chosen, and our current choice is Polygon.

oPortal V2.0

We will build bridges from L1s and L2s to the relay chain first. Powered by the oPortal TwoWay Bridge, you will be able to bridge any amount of USDT through the oPortal to the relay chain and receive an equivalent amount of oUSDT there. This process is similar to depositing your assets to centralized exchanges. However, since we use a relay chain (such as Polygon) as the server, our bridging process will be decentralized. Up until now, this is for free. You only have to cover some small amount of gas fee and network cost.

Step 2

It should be noted that oUSDT is a wrapped token. So we will have a second step: you will pick your destination chain on our TwoWay Bridge and then transfer your oUSDT from the relay chain back to L1s or L2s in exchange for an actual USDT. Now you have successfully transferred a real USDT token across different blockchains. So far so good?

This is similar to the withdrawal process on a centralized exchange. Of course, our process is a decentralized one, because we use blockchain as the server. This step is the key to oPortal’s profitability. The cross-chain transfer fees will be set to a floating rate, according to the remaining liquidity of different chains.

In the meantime, we will combine the above two steps.

For users:

Although the underlying protocol has performed the above 2 steps, you don’t need to fully understand the principle behind it. You just need to pick the destination chain for your transfer, wait for a few minutes, and then you’ll get your USDT there. In most cases, you don’t even have to know the existence of a relay chain, and you don’t need to own any gas fees for the relay chain.

For LPs:

There is no LP Token, except for step 1. Once you obtain oUSDT through our cross-chain bridge, you become an LP to some extent. The cost for you is almost zero, just some gas and network fee. If this is your first time to use Polygon, you will receive some $Matic for free to help you quickly get started.

Pricing Model and Treasury

Provide LP: free; only some gas and network fee.

Cross-chain/remove LP: floating rate.

Depending on the liquidity value after the cross-chain/withdrawal:

  • If the remaining liquidity on the destination chain is more than 500K USD, a 0.05% fee will be charged;
  • If the remaining liquidity on the destination chain is more than 100K USD, a 0.3% fee will be charged;
  • If the remaining liquidity on the destination chain is less than 100K USD, a 1% fee will be charged.

For example, if the remaining liquidity of the cross-chain bridge is 600K USD and you want to transfer 10K USD, you will have to pay a fee of 5 USD; if the remaining liquidity of the cross-chain bridge is 120K USD and you want to transfer 21K USD, your transfer fee will be 20K*0.3%+1K*1%=70 USD.

The above cross-chain bridge fees collected will go directly to the treasury, 50% of which will be reserved for the oUSDT pool, and the rest will be used to burn $BORING!

About the Consistency of a Distributed Network

The biggest advantage of using a relay chain is that it is easier to maintain the consistency of a distributed network. With this V2.0 solution, the probability for transactions to be stuck will be reduced by 70%~90%. In the past, we had to rely on the status of several chains for data collecting. Now we only need to focus on the relay chain, and Polygon will be our first choice due to its good TPS, stability and low cost. According to the feedbacks received from our community members, we will also expand to other relay chains later on so that we can have some switch options just in case something happens to the polygon chain.


Soon after oPortal V2.0 goes live, we will begin to support more tokens such as USDC, DAI, and ETH, or even BNB, CRV, Sushi and other tokens. It is highly scalable.

Looking forward to the oPortal V2.0 era!

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We wish to keep our growing community engaged with our goal to bring more possibilities to the cross-chain adventure, so be sure to follow us on Discord, Twitter, and Telegram!




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