Admob Alternative in Thunkable for free

We have to make a school project that must benefit us in any way, whether by ads, affilate marketing or any other things. And i have decided to make a thunkable app, and add ads or products for earning.
I want to ask, can we add admob ads in free
And if not, then is there any alternative that we can use in free.
Like, using any platform, which show ads with their API key.
I had also read this article -, but i think this will increase the load on my app, and my app will work extremely slow, as my app will have around minimum - 12-15 screens.

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