Hi
What is cheap and free exchanges to list a token ERC-20?
Are you considering to list token for your projects?
You should consider other factors before you proceed so as to make investors happier and not end up listing token on a scrap exchange without volume or zero buyers.
Anything free are almost not too good if my opinion, Uniswap is just an example, you may list token on such exchange without liquidity. If you choose to go centralized once, you may end up with zero buy order book. Examples include vindax, fine box, folk delta etcetera.
It's better to raise enough fund and list your token on low budget exchanges such as probiy6pr bithumb or provide liquidity as a team lock them for a year to avoid price slippage.