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Ultra EVM Fee Structure ​

This document provides an overview of the fees charged on the Ultra EVM for both normal EVM transactions and bridge-in transactions.

1. EVM Transactions (including bridge-out) ​

When sending a transaction from one EVM address to another (or bridging out), the fee structure is:

  1. Gas Fee: gas price * gas used
  2. Distribution of Gas Fee:
    • 10% goes to the EVM miner.
    • 90% goes to the EVM account (a system account designated to receive a portion of the fees).
  3. Charged On Top of Transaction Amount
    If you send 1 UOS from evm1 to evm2, you will pay the 1 UOS plus the gas fee.

Example ​

  • Transaction: Send 1 UOS from evm1 to evm2
  • Gas Used: 21000 (example figure)
  • Gas Price: 0.0000015 UOS/Unit (example figure)
  • Gas Fee: 21000 * 0.0000015 = 0.0315 UOS
  • Total Charged to Sender: 1 UOS + 0.0315 UOS = 1.0315 UOS
  • Amount Received by Recipient: 1 UOS
  • Gas Fee Distribution: 0.0315 UOS
    • 10% (0.00315 UOS) goes to EVM miner
    • 90% (0.02835 UOS) goes to EVM account

2. UOS Bridge-In Transactions ​

When bridging UOS from a non-EVM Ultra account into the EVM, a fixed bridge-in fee applies:

  1. Fixed Bridge-In Fee: 0.1 UOS
  2. No Other Fees: No gas fee is charged on bridge-in; only the fixed fee is applied.
  3. Charged From Sent Amount
    If you send 1 UOS to the EVM, the receiving EVM address will get 1 UOS - 0.1 UOS = 0.9 UOS.

Example ​

  • Transaction: Send 1 UOS from a non-EVM Ultra account (account1) to an EVM address (evm1)
  • Fixed Bridge-In Fee: 0.1 UOS
  • Amount Received by Recipient: 1 UOS - 0.1 UOS = 0.9 UOS
  • Fee Recipient: The 0.1 UOS fee goes to the EVM account

Summary ​

  • EVM Transactions:

    • Gas fee = gas price * gas used
    • 10% of gas fee → EVM miner
    • 90% of gas fee → EVM account
    • Gas fee is in addition to the sent amount

  • Bridge-In Transactions:

    • Fixed fee = 0.1 UOS
    • Deducted from the sent amount
    • Goes entirely to the EVM account