Any reliable hosting service with unique pay-as-you-use pricing model ?

[wwwspyder]

Greetings to all,
I would like to make a notion of all possible services offering a unique pay-as-you-use pricing model.
For instance, I own an online business in Europe and I don't want to buy a big server with huge resources.
I want only pay for what I use. Are there any suitable service on the web?
One of my friends suggested me contacting Jelastic.com which is quite a good option for me.
Do you know anything about them: their service, reliability and professionalism?
Any other options for my consideration?

Thanks.

[Finelige]

I'd like to express the point that Jelastic.com is a Multi-Cloud DevOps PaaS for ISVs, telcos, service providers and enterprises needing to speed up development, reduce cost of IT infrastructure, improve uptime and security. The platform supports Java, PHP, Ruby, Node.js, Python, Go environments, as well as Docker and Kubernetes clusters.

Really good solution for Online Business. Recommended.