How much is the broker’s fee for RTBs? February 28, 2020 02:46 Updated None. There is no transaction fee for the primary issuance of RTBs. Related articles What will be my proof of ownership for RTB? Can I order RTB anytime? Can I order RTB from overseas? Can I sell partial amounts of the RTB? For RTB purchase, I already funded my account but the prompt still says not enough buying power.