a.k.a. micro influencer, nano influencer
A microinfluencer is an influencer with a social media following between 2,000 and 50,000 users. While these influencers have a smaller following, they tend to have a higher engagement rate, more trust among their audience, and often audiences whose interests are more defined. 

Historical perspective: To get paid as any kind of an influencer also depends on the platform. For example on Instagram, engagement with followers is more important than number, but to approach brands you need at least over 5,000 followers. Influencers charge around $10 per 1,000 followers.
NetLingo Classification: Online Jargon