Looking at on line bookings for providers in Singapore, I found a website that advertised the top 5 SG agencies, and scrolled down to:
https://secretbunnies.com,
as this one had what looked like the most reasonable rates but still with providers that got me interested. I contacted a few to get comms open in advance. Two of them got back to me quickly, one indicating a hotel in SG where she was working not too far from where I'll be staying. But I really wanted to see reviews on these two, so did image searches. On one of them, I found identical images on another site:
https://secretdoha.com
which is almost exactly like the secretbunnies site. For kicks, I contacted the provider to confirm she was in Doha. Yep. Pretty sure a provider can't be in SG and Doha at the same time, so...
The other provider that I contacted from secretbunnies listed there as Japanese. Did an image search for that one too. Found her advertising on another page, listed as Mongolian. Found her image on yet another site indicating the pic was posted four years ago.
Anyhoo... Buyer beware on secretbunnies website. Maybe someone has had a success story having used this site, but until I hear otherwise, I'd avoid.