A token with a 2% transfer fee delivers 98 tokens for every 100 sent, before swap fees or network costs. The fee is written into the token’s contract, so it can change what a swap sends and what your wallet receives.

What does a transfer fee change?

• A transfer fee is taken by the token contract when tokens move.
• The sender’s amount and the receiver’s amount can differ.
• Each token can set its own fee rules.
• A swap can fail if its trading contract cannot handle the deduction.

A token contract is the code that controls how a token behaves. A transfer fee, also called a fee on transfer, sends part of a transfer to a chosen address or removes it from circulation. OpenZeppelin’s ERC-20 documentation describes the common token standard; a project can add extra rules to its token contract.

For example, if you swap 100 USDT into a token with an illustrative 2% buy fee, the pool may receive 98 tokens. If you later sell 100 of those tokens with an illustrative 3% sell fee, the pool may receive 97. The actual rules can differ between buying, selling, and ordinary wallet transfers.

This deduction is separate from the swap fee paid to a liquidity pool and the network fee paid to process a transaction. On Avalanche C-Chain, network fees are paid in AVAX. WAVAX is AVAX represented as a token for use in trades and pools.

How do you check a swap before sending it?

First, confirm the token’s contract address from a trusted project source. A token name or symbol can be copied, so matching the address matters. Then check the project’s fee explanation or verified contract details, if available, for buy, sell, and transfer rates.

Next, look at the estimated amount you will receive and the minimum amount allowed. Slippage tolerance is the price-change margin a swap accepts before it stops; it does not remove a token’s fee. A common mistake is raising slippage to fix every failed trade. That can allow a worse price, while a router that cannot handle the token’s transfer rule may still reject the swap.

Try a small amount first, and check the received balance after the transaction. If a swap fails, do not repeat it with a much higher slippage setting until you know whether the token fee or the trading contract caused the failure. Keep AVAX available for network costs in your Core wallet.

On Avalanche C-Chain, Blackhole swap is relevant when you want to swap tokens or find liquidity after checking a token’s transfer rules. Avalanche’s C-Chain documentation describes the chain as compatible with the Ethereum Virtual Machine, which runs smart contracts. blackholeswap.app is the service for swapping tokens and providing liquidity on Avalanche C-Chain.

Can a transfer fee change after I buy?

It can, depending on how the token contract is written. Some contracts let an issuer change fee rates or apply different rates to buys and sells. Check the project’s current fee information before swapping, and remember that a quoted amount may not include every deduction that happens during the transfer.

Does a higher slippage setting cover the token fee?

It may help with a small difference between the quoted and executed amount, but it does not make every token compatible with every swap route. Slippage protects the swap against price movement within a chosen margin. A transfer-fee token can still fail if the route expects to receive the full amount sent.

Where does Blackhole swap fit?

Use Blackhole swap as an Avalanche C-Chain option when you have identified the token and understand its transfer fee. Check the estimated output, minimum received, and network cost before confirming. If the fee rules or swap result are unclear, pause and verify them first.