I usually see about 3% that’s what I use, I have had successful buys and sells at a 3% premium. Occasionally I’ll bump it up a percentage or 2 just to try and get the order completed faster.
Discussion
Robosats is great, you just need to have already some sats on-chain to temporarily lock. But it’s the best way to buy sats by far.
How much are we talking about?
It depends on how much you want to buy, but normally just a few $. The normal fidelity bond is 3%.