Fee

Fee Structure：

The Helix bridge fee includes two parts:

Fees	Explanation	Tip
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
Ethereum → Darwinia *	Helix	RING	decided by message relayer
Darwinia → Ethereum *	Helix	RING	decided by message relayer
Arbitrum → Ethereum *	Helix	RING	decided by message relayer

• 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.