Gas Fee Estimation

Every cost is estimated upfront and included in the quoted output — no hidden fees, no surprises after signing.

What Users See

Before a user signs a transaction, WheelX shows a clear breakdown of the total cost impact. Instead of presenting a single opaque fee number, we break it into three transparent components:

Component	Description	Example
Swap Impact	Price impact caused by moving through DEX liquidity	-$0.02 (-0.68%)
Dst Gas Fee	Destination chain gas required to complete the transaction	Free (when sponsored)
WheelX Fee	Platform service fee for using WheelX infrastructure	-$0.06
Total Price Impact	Sum of all cost components	-$0.08

The output amount shown is already net of all fees. The user receives exactly what the quote displays — no additional charges are deducted after confirmation.

How It Works

1. Real-time price and gas data

WheelX continuously pulls live data from every supported chain and liquidity source, including:

• DEX pool prices and depth (for price impact)
• Current gas prices on source and destination chains
• Bridge relay costs and relayer availability

2. Multi-hop route simulation

For routes that include multiple steps (e.g., bridge + swap), the system simulates each step and calculates the cumulative cost impact. This includes:

• Price impact on each DEX leg
• Gas cost on the destination chain
• Any bridge or relay fees
• The WheelX platform fee

3. Fee sponsorship layer

Where enabled, WheelX can sponsor the destination gas fee so the user sees Dst Gas Fee: Free. This is especially important for payments and onboarding flows where users may not hold the destination chain's native token.

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Fee Components Explained

Swap Impact

Swap impact occurs when the trade size is large relative to the liquidity available in the DEX pool. It is expressed as both a dollar amount and a percentage of the trade.

Example: A -$0.02 impact on an $11.72 trade means the user receives 0.68% less than the mid-market price due to DEX slippage.

Dst Gas Fee

This is the gas required to execute the final transaction on the destination chain. Depending on configuration, it may be:

• Paid by user — Deducted from the output or required as native gas token
• Sponsored — Covered by the merchant, app, or WheelX fee system, shown as Free to the user

WheelX Fee

The platform service fee for routing, bridging, and executing the transaction through WheelX infrastructure. It is always shown in dollar terms and deducted from the output amount.

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Why It Matters

• No surprises — All costs are visible before signing. Users know exactly what they will receive.
• No extra gas tokens needed — Sponsored gas fees let users pay with any token from any chain.
• Better UX for payments — Merchants can absorb gas costs so customers only see a clean final amount.
• Easy comparison — Total price impact makes it simple to compare routes across different bridges or DEXs.
• Budget-friendly — Large transactions are easy to plan because the full cost is quoted upfront.

From Fee Estimation to Gasless Payments

Gas fee estimation is the foundation for fully gasless transactions:

1. Estimate the destination gas fee accurately.
2. Sponsor that fee via the Fee Sponsorship system.
3. Show users a clean quote where the only visible cost is the platform fee and swap impact.

This is how WheelX enables users to pay from any chain with any token — even if they don't hold ETH, BNB, or other native gas tokens on the destination chain.