Fee

The x/fee module is a core component of the Sunrise blockchain responsible for managing transaction fees. It introduces mechanisms for burning a portion of $RISE tokens used as fees, enforcing fee denominations, and providing flexibility through bypass denominations. This module supports deflationary tokenomics while maintaining an efficient fee system.

Key Features of x/fee

1. Burn Mechanism:

   • A portion of $RISE tokens used as transaction fees is burned to reduce the circulating supply.

   • The burn ratio is determined by the burn_ratio parameter (default: 50%).

2. Fee Denomination (fee_denom):

   • Specifies the denomination required for transaction fees (default: "urise").

   • Transactions must pay fees in this denomination unless bypassed.

3. Bypass Denominations (bypass_denoms):

   • Allows certain denominations to bypass standard fee restrictions.

   • Default bypass denomination: "uvrise".

4. Dynamic Parameter Configuration:

   • Developers can configure parameters dynamically with validation enforced by the module.

Core Functionality

Fee Deduction and Burning

When a transaction is processed:

1. Fees are deducted from the sender's account.

2. A portion of the fees is sent to the fee collector module account.

3. The remaining portion is burned to reduce $RISE token supply.

   func DeductFees(bankKeeper BankKeeper, ctx sdk.Context, acc sdk.AccountI, fees sdk.Coins, feeKeeper feekeeper.Keeper) error {
   ...
   if err := feeKeeper.Burn(ctx, fees); err != nil {
   return err
   }
   ...
   }

Parameter Configuration

Parameter	Description
Fee Denomination (fee_denom)	Specifies the denomination required for transaction fees (default: "urise").
Burn Ratio (burn_ratio)	Percentage of transaction fees to burn (default: 0.5). Must be between 0 and 1.
Bypass Denominations (bypass_denoms)	List of denominations that bypass fee restrictions (default: ["uvrise"]).

Example Configuration:

{
  "fee_denom": "urise",
  "burn_ratio": 0.5,
  "bypass_denoms": ["uvrise"]
}

Benefits of the Fee Module

• Deflationary Pressure: The burning mechanism introduces deflationary pressure on $RISE tokens, supporting long-term token value.

• Fee Flexibility: Configurable parameters like bypass_denoms provide flexibility for specialized transaction scenarios.

For more details and implementation specifics, see the GitHub repository.

Workflow: Fee Deduction and Burning

Below is a sequence diagram illustrating how transaction fees are processed:

Example Usage

Developers can query fee parameters using Sunrise Client JS:

import { SunriseClient } from "@sunriselayer/client";

async function queryFeeParams() {
    const cometRpc = "https://sunrise-test-da-1.cauchye.net/";
    const client = await SunriseClient.connect(cometRpc);
    const queryClient = client.getQueryClient();

    if (!queryClient) {
        console.error("Query client not initialized");
        return;
    }

    const feeParams = await queryClient.fee.params({});
    console.log("Fee Parameters:", feeParams.params);
}
queryFeeParams();

Example Output:

{
  "fee_denom": "urise",
  "burn_ratio": "0.5",
  "bypass_denoms": ["uvrise"]
}