the message said it clearly "value must be between 10 and 31907946" (sats) and is totally understandable. SN had a similar issue when was custodial, I'd be curious to know how rizful fix the small-zaps issue.

Another fact to mention is that these free test rizful runs are really useful to improve the connectivity between different service providers. It's obvious they take the good opportunity to sell their service each time lol