1. Check it the team got linked in and determine if they are fit to run such a project with relevant expirience etc.
2. Check social media following / activity, the more followers and interested peps, the bigger the chance of a good listing price.
3. Check the idea, if you first of all like the idea but also see a way that this idea can generate a large network or save money for companies, it sounds good.
4. Check all available code, GitHub if they have a repository, check if there is a white paper / road map or similar and how they express their idea in the publications and of course if everything looks professional, including the official web page design.
5. Check for others that did their research to get some second opinions and if you like all the 5 points, invest what you can afford to loose hehe