No-SDK ad networks

Are there any ad networks that allow you to use their ads simply via a WebView (or a Rest API or something like that) without requiring you to include their SDK in your project?

Appnext have this option

Yes, I also know about Appnext, you can contact Jonathan to tell you how it works. I use their webview “appwall” and converts nicely even though their apps are almost always the same. For me it’s voluntary anyway - whoever wants, checks my More Apps button.

However I really want to know more of this kind of ad providers. Makes things easy!

If you want to know more:
-more affiliate sites with direct offers, look for CPA mobile in google search