MULTISENDER charges a flat fee per transaction, each network has a different ceiling on the amount of tokens which can be sent in a single transaction. A full list of each network fee is listed below.

Ethereum0.035 ETHper 200 addresses
Binance0.02 BNBper 30 addresses
Solana0.5 Solanaper 200 addresses
Tron100 Tronper 100 addresses