Good question! eHealth Exchange (eHEX) is one of 3 national HIEs that we connect to (currently through Carequality). eHEX is mainly focused on connecting to state-level regional HIEs, which cover a different portion of providers than CommonWell, or Carequality do.
For example, Cerner is a major EHR vendor (used by the VA and others) whose data can only be accessed through CommonWell, since they don't participate in other HIEs.
> that have many years of experience
Relatively speaking, modern HIEs are a relatively new concept (Carequality was founded in 2014) - so extra years of experience doesn't necessarily add any value, and usually just results in more legacy tech to deal with!
TL;DR just to get started it's going to cost you $20k + some months to integrate, $12.5k/yr as the base membership fee (up to $400k if you make a lot of money!), and they charge a per-query price.
The caveat here is per-query in eHEX, isn't what a query is in Metriport. They literally mean every single query (remember the HTTP requests to thousands of endpoints to find patient records, each one of those would be a query). So, if you want to integrate with eHEX only to get limited, messy C-CDA data, then you're looking at paying ~$0.80 per full record retrieval for a patient with 2k documents.
