this is not true, you can rent just about any hash power you want. however the minimum amount of btc is 0.005 btc , then using whatever amount you want you can declare the amount of hashing power you want, the more you ask for the less time you'l get it
for example at the time of typing this, the price per PH per Day for sha256 is 0.0447 btc
so assuming you want 2ph for the same price, then you will have that power for only half a day (12 hours )
say you want to mine for 2 days for that same amount of money then you will request 0.5 PH.
Thanks for all the info! I already found out about the different ports for different difficulty and nicehash compatibility, but I honestly don't understand how their UI works.
What does the minimum hashrate mean? Where do I set the duration? I understood from their FAQ that I just put my order and let it fill. I can understand how this could work for a classic pool, where you buy an amount of hash, burn it all on pool shares, and that's that.
It's just that for a pool like solo ckpool, mining for 1 hour with 100 PH/s or mining for 100 hours with 1 PH/s is not the same..