You are right @sj1, high real usage or spam could result in a relatively huge amount for one person, in this case for me… But for this DEMO, I use a Prepaid account and the balance was 50 USD that allow approximately 1000 SMS (so 0.05$ per texto, received and send).
I plan to get a maximum of 20-50 users (registered with START) for this demo. And also if this numbers get spammed, I will mount the same server with a other number that I will send manually to the registred user to give them the possibility to “withdraws” the BTCZ. Additionally I removed the US numbers to avoid spammer (Outside of switzerland, a spammer will also be charged by the operator for the SMS’s).
A estimation is that the 50 (max.) users could be able to do approximativ 5-10 transactions (20 SMS’s per persons).
I prepare a proposal, with some files that I will share to the community before. This proposal will be high level with some applicable fees proposes to support the plateforme (and maybe some restrictions) and others functionality. But let me time until the end of the week…