Bitcoin has dynamic fees. You can opt to pay a fee for faster confirmation time but you can transact without paying a fee.
In Peercoins, there is a fixed fee of $0.01/kb. It is destroyed rather than giving it to miners like bitcoin. Because of this, PPC would be impractical for microtransactions in the future when its value rises. The coin would be mostly for speculation.
I'm looking for a PoS coin which allows for having zero transaction fees when there is less transactions to confirm but is dynamic enough to increase when there is load on the network. This allows for optimum growth because the market can balance liquidity and confirmation time.
You don't ask for much, lol.
Just maybe the one at this link is a close enough match for your desires. It kinda fell off half off the map for a while but suddenly many are again mining it. But it still has tiny transaction fees now. And isn't an exact match. But comes close. I recall it used to have no transaction fees when I mined a bit of it. But that appears to have slightly been altered from what I just read.
See
https://bitcointalk.org/index.php?topic=245951.0 Then again I am not certain any crypto would be sustainable long term without the mining incentive of transaction fees supporting it's networks blockchain maintenance/upkeep (transactions function), if I understand this correctly?
Hence maybe why the one above like all the others(?) shifted to a modest transaction fee itself, upon further analysis.
Search for yourself at:
https://bitcointalk.org/index.php?action=search Best tool here is this.
Caveat emptor - let the buyer beware!