Lightweight client/server solution for managing banner impressions/bids ?

Question

PHP

Tell me, can anyone come across a lightweight solution (API) that would help to correctly distribute product impressions (Banners?) Based on the price of rates and limits.
For example, what you need:
- There are 1000 customers with 1000 products
- Each of the customers wants to "advertise" their product. When choosing a product, he indicates the bid for XXX impressions and the impression limit - YYYY - A person in his
personal account selects a product, enters how much he is willing to spend and voila. rates. If someone pays $2, then he should get 2 times more impressions than someone who pays $1.
You can of course fasten OpenX fluently, but it scares him to slow down even under heavy loads and monstrosity. I want something lighter.