well it seems like tether to me and after tether also bitrex have issued its coin which is always stable so this kind of projects are becoming more and more in the scenes which are for good use of course but what I think is that they are not stable enough because can be crashed any time cuz are not backed by anything
I disagree. If you look into Havven's dual token system, the system backs itself through fees. Here's an excerpt I found from another thread:
The Havven platform uses two tokens to achieve stability. The havven token provides the collateral for the platform. Nomin tokens, a stablecoin, are issued against the value of the collateral token. This dual token approach incentivises users to hold havven tokens because network transaction fees are paid to havven holders. As more people use nomins for everyday transactions, the value of havven tokens will increase due to the higher fees generated.
Havven is a totally decentralised stablecoin, which means that, like bitcoin, it is secure and resistant to censorship. However, in contrast to Bitcoin, Havven uses a decentralised asset to reduce price volatility. The asset backing for the stablecoin comes from transaction fees generated by the Havven network. This means the asset is distributed and cannot be lost, stolen or seized.