Try/Check Zoho Subscriptions (I am happy customer of "Zoho Subscriptions") - They support Many features, metered billing, Payment Methods, Many Integrations etc. Without taking much data (except what is needed minimal). And very good tech as well as non-tech customer support! And they charge reasonably fixed, transparent and predictive price.
I understand need and pain point and multiple players can exist, Key is to have transparent pricing. (You can always have custom plan/discount/ change in pricing in future etc for future customer).
Also who is your target customer? Tech company may likely implement their own billing software or use existing proven players.
I think (Happy to be wrong!) - 1. Trying to find Non-Core-Tech/Offline subscriptions service and what are their pain points? 2. Why only usage based billing?
I know there are very less tools/software for SaaS/recurring/Subscriptions based billing (Zoho, Chargebee, Recurly, Shopify few of them) so wish you good luck.