Discussion on: JAMStack, but you need an API anyway? Which hosting to choose?

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Replies for: Can I use a full REST API, or do I have to use their serverless functions (which IMO is very very easier to use than Netlify)?

I think you can use any endpoints. They use Notion api for querying documents in their example.
I am happy with Vercel with my WIP sapper ecommerce site.