I want a browser extension (or native feature) that searches several engines at once and display's the results side-by-side. Sort of like this:

    +-------------------------------+
    | Search string                 |
    +---------+----------+----------+
    |         |          |          |
    | Bing    | DDG      | Google   |
    |         |          |          |
    | Hit 1   | Hit 1    | Hit 1    |
    |         |          |          |
    | Hit 2   | Hit 2    | Hit 2    |
    |         |          |          |
    | Hit 3   | Hit 3    | Hit 3    |
    |         |          |          |
    +---------+----------+----------+

And I want to be able to pull it up instantly with a keyboard shortcut.

The extension would need to be smart enough to de-duplicate hits across the different engines.

Finally, I really REALLY want to pay for the search engines themselves (make it a subscription at $50/m or something), because then I know their incentives are aligned with my needs rather than with their ad business's needs.

I don't think any of the search engines have search API's? Maybe they could make API access a paid feature.