There are not such sites Exist as far as I know. If there are they probably not that correct. In Crypto things like Fair Value doesn't Work. Because the market is not regulated so the manipulation is at their best. There is no away a project who Raised over $80M in their token sale lost value of 98% it's because they sold everything they had and did not deliver anything they promised. 

I just read this article and found very interesting knowledge ''Guide to Determining Fair Market Value (FMV) for Cryptocurrency Assets''

Full read here - https://cryptforensic.com/2019/01/10/guide-to-determining-fair-market-value-fmv-for-cryptocurrency-assets/