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

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.

It will be cool solution for running business online - Jelastic.com will meet your demands.
They offer clustered solutions for different applications and stacks that can be installed just in one click and are pre-configured for automatic scaling.

For instance, they offer WordPress cluster installation, just visit this tutorial link:
https://www.youtube.com/watch?v=GalbkKxC79Y

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Jelastic.com have a unique pay-as-you-use pricing model and is available as public, private, hybrid and multi-cloud in about 60 data centers worldwide.
They offer auto-clustering solutions at reasonable rates - you will pay for what you used. Examples:
- WordPress cluster
- Magento Cluster
- MySQL/MariaDB clustering