The peak price was 650 sat, now it has fallen back to 400 sat. It is possible due to the fact that this coin is for long time traded only on this forum.
I think it's because Bitcoin's price also shoot up so the dollar value of Mrai is roughly the same.
I don't think many coins were traded for 650 but looking back at it, two weeks ago 1 Mrai was about 450 sats which meant $4.68 per 1000 Mrai at the time.
Now that Mrai is around 400 but Bitcoin is up ~22%, it's $5.10 per 1000 Mrai.