#CryptoFees101 Transaction fees in crypto, or transaction costs, are expenses paid to validate and secure exchanges on a blockchain. They vary depending on the network used: on Bitcoin or Ethereum, they can be high during congestion. These fees compensate miners (or validators) for their work. On certain blockchains like Solana or Polygon, the fees are very low, encouraging microtransactions. Fees can also depend on the desired speed: the more you pay, the more prioritized the transaction is. Finally, some DeFi protocols impose additional fees for exchanges, loans, or borrowings on their platforms.