Fiver in his affiliate program have “GIG ADS WIDGET” where you can select a category, podcategory, filter by relevant keywords, set a minimum and maximum prices for gigs (which you will paste in your website and start earning money!)

Then you apply filter and get recommended services that Fiverr provides and copy paste embed code into your code, like this:

I choose category: digital marketing with podcategory SEO optimization, price range from 10 to 20 dollars and get something like this: