I just transfered some domain names to Namecheap, because I didnt put my dns adresses yet, a parking commercial page appears instead of "domain unfounded"

Where can I transfer my domains to not have that?

Point it to DNS on your own server or hosting account. I'm fairly certain all registrars currently monetize by parking on their own ads if you don't specify, and there isn't an opt out option I'm aware of.

Upload your blank index.html page on the server.This can be a solution if you can host a site.

Point it to DNS on your own server or hosting account. I'm fairly certain all registrars currently monetize by parking on their own ads if you don't specify, and there isn't an opt out option I'm aware of.
I don't know about Namecheap specifically, and I agree that registrars do this by default, I don't think its unusual to have an option. I know we have ads on a parked domain by default, but a customer can choose no ads if they want.

I don't know about Namecheap specifically, and I agree that registrars do this by default, I don't think its unusual to have an option. I know we have ads on a parked domain by default, but a customer can choose no ads if they want.

That must be a cache. I suppose in a time everything will be changed.

I just transfered some domain names to Namecheap, because I didnt put my dns adresses yet, a parking commercial page appears instead of "domain unfounded"

Where can I transfer my domains to not have that?

Click on domain and choose 'URL Forwarding' from left side menu. You'll be able to remove redirect to a parking page from there.