Hi, My last project was exactly what you need. We exactly created a platform with 5 different currencies in a single wallet for every user from the platform and with our method it saves miner fee
Relevant Skills and Experience
Blockchain, javascript, nodeJS, angular 4, Cryptocurrencies APIS
Proposed Milestones
$555 USD - Use Blockchain APIS for needed Currencies
Additional Services Offered
$250 USD - I can help you create a cool platform which works with many currencies and save miner fee
I've done what you need, but I can help you with my suggestion and you can even earn money from fees