One neat thing I recently encountered is that people are listing apartments with fees as "no-fee" on StreetEasy.

That is, I inquired about a no-fee listing and was met with "actually, there is a 15% on this listing is that ok?".

To address a sibling comment, there are still bait-and-switch listings as well. Many of these are listed as having been on the market for 50+ days. You can spot these placeholder listings with practice. They're especially common with larger, managed [airquotes]luxury[/airquotes] apartments.

The fee is always paid. No Fee = paid by landlord. Usually those no fees are non desirable units (lack of light, etc). In my case tenants pay a transaction fee (3%), lower compared to 15% that brokers charge. I just provide financial validation, a non bias system (software is unbiased, brokers are biased), a digital contract and I provide the lead to the landlord