The Helix bridge fee includes two parts:
|Gas Fee||the transaction fee paid in your wallet to miners.||This is just like any transaction on a blockchain network.|
|Msg Bridging Fee||the fee paid to bridging provider for relaying the msg across chains||The cost of this part varies according to the integrated bridge.|
Helix doesn't charge any more fees than these two parts from a user.
The only fees you need to pay are Gas fees (for transactions), and Msg Bridging fees (fee paid to bridging provider).
- Msg Bridging Fee for each type of bridge
|From-To||Provider||Pay with_token||Fee cost|
|Darwinia <>Crab Smart Chain Crab Chain <> Crab Parachain||Helix||NativeToken||Prices are totally determined by the market |
|Crab Chain<>Crab Smart Chain||Helix||-||free|
|Ethereum → Darwinia *||Helix||RING||10 RING per transaction|
|Darwinia → Ethereum *||Helix||RING||50 RING per transaction|
|Heco<> Crab Parachain||cBridge|
Note: Since transactions (Ethereum<>Dariwinia) are involved on the Ethereum network, there will be a relatively high cost of gas fee to pay. The users can decide when to initiate the transaction based on the real-time gas price on the Ethereum chain.
You can calculate Ethereum gas fees by multiplying the gas limit of a transaction with the existing gas price.
gas Fee = gas limit * gas price
Getting the gas limit
from-to gas limit Ethereum → Darwinia 100,000～130,000 Darwinia → Ethereum 500,000~600,000
Getting the gas price
If you are on Ethereum mainnet you can check Etherscan's gas tool to estimate today's gas price. Please note the gas price fluctuates; always refer to the gas station to see the current gas prices. (1 gwei=0.000000001 ETH)
So with all that in mind, here is an example of a basic gas fee calculation.
Let’s say that Alice wants to make a transaction from Ethereum to Darwinia on Helix. The current gas price is 18 gwei. The live Ethereum price today is $1,000 USD per ETH.
The gas calculation formula is: 130,000 (gas limit) * 18 (gwei) * 0.000000001 (ETH) =0.00234 ETH
or you can say that Alice has to pay US$2.34 for the transaction from Ethereum to Darwinia.