Surveys are the bread and butter for many market research companies. Most of the corporates / enterprises typically engage with smaller to larger (and many a times multiple) MR agencies. These MR companies can benefit from your service. To explore these companies, you can check out the MR members directory list from ESOMAR ,the voice of the MR (www.esomar.org), perhaps a membership / participating in their events may help you. Other site is agencyspotter.com
Explore publishing an article at the Greenbook blog run by Leonard Murphy which is very relevant to this case and he also runs the IIEX events globally ( http://iiex-na.insightinnovation.org/ ) where tools /services such as yours are very much the hot thing..
Check out Unilever Foundry https://foundry.unilever.com/ . You can sign up and explore if you can help solve some of their problems with your solution. They select and fund Pilot projects
Twitter hashtags to get your tool noted in the MR industry #mrx #newmr
Ads / promotions: check out http://newmr.org/ , http://www.greenbookblog.org/
Explore if you have complementary business synergies to present with https://www.zappistore.com/ (e.g your product could be a part of the Zappistore platform as an App.)
Best Wishes, N.Sankar https://www.linkedin.com/in/nsk007