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Webhooks are outbound calls from Marketo.
Presumably you're looking for the API lead creation activity, which will only happen with a Lead Was Created w/Source = API.
I wouldn't use the OptIn Monster integration. Just put a Marketo form in your OptIn. That gives you full Filled Out Form and web session tracking which you won't get otherwise.
Thanks Sanford, that is what I am leaning towards right now too!