Marketplace does not charge any fee for any cryptocurrency deposits.
However:
Do note that when you withdraw from your external provider (Ex.: Your external wallet or exchange) to transfer to Marketplace, a network fee is incurred by your provider as payment to the miners that process these transactions on the blockchain. Neither your provider nor Marketplace receive these fees.
This is the same for other people sending their cryptocurrencies to you.
Important note: Because of these fees, it may result in a very small reduction of the amount of cryptocurrency actually sent to Marketplace.
The average network fees are as follows (But can fluctuate greatly due to network traffic):
Bitcoin 0.0005BTC
Ethereum 0.005ETH