products, the apps that are in a space. But for most technology trends, there's actually a number of successful companies that are created in terms of the companies that are enabling them. Those are the companies that are providing infrastructure, different services help enable these companies, and those companies tend to get a lot less attention. That's definitely an area we're now seeing in a host of different areas from route, vehicle optimization and logistics.
A few companies now are sprouting up and receiving seed funding. Background checks, Checkr and Onfido both raised a Series A recently. And then a whole host of companies within the "1099 economy" as well as companies that are providing extra supply-side optimization for areas like short-term rentals providing ways to manage those rentals as well as onboard contract workers and employees into these on-demand models.
Lastly, we're also seeing some companies within mobile who are helping provide app promotion and deep linking. Button is one company that just recently powered the cross integration between Foursquare and Uber, and we're seeing a lot of companies there as well. This universe of on-demand infrastructure and services, at CB Insights we’re seeing the data in terms of seed deals in early rounds, but this is a universe that we're interested in because it's growing very fast.