Sayabc are a branch of VIPKid. I would urge you to read this users review should you wish to go ahead and apply. One might argue it’s better than any third person review.
The base rate is 15 USD per 40-minute class ($22 for subbing) which isn’t bad but should you full just a fraction short of the 40 minute mark, then perhaps you might not see what’s due.
There are many criticisms listed in this comprehensive review, with greatest dissatisfaction voiced towards dealing with their Chinese staff. On the plus side though they do pay reasonably well and if you can stomach swallowing your dignity in exchange for some extra dollar then proceed ahead.