There are a lot of startups and larger companies in the market today building software for physical retailers who lack a lot of data about their customers, as well as those building payment systems. There’s also been some consolidation, failures, and generally more sober views of what the bigger potential of this market might be, especially in the four years between Index first forming its business and today. What’s interesting about Index its background, the approach that it takes, and the success it has had so far. The startup was founded by Marc Freed-Finnegan and Jonathan Wall, respectively the product lead and the co-founder of Google Wallet (and now Index’s CEO and CTO), who left Google as part of the much-reported Wallet exodus to strike out on their own.

https://techcrunch.com/2016/06/30/google-wallet-vets-get-19m-more-for-index-which-helps-offline-retailers-be-more-like-online-ones/