Buy RAM through EOS transfer, No additional charges.
Buy RAM for others, please write receiver EOS account in the transfer memo.
The code is open source, the private key is eosio.null, and there are no other fees. You can use it with confidence.
3eb86b2a79e20c72400635a8df14e8147809e7e1aa92f6d6507f919da6184dbe