The following hubs implement Scholix compliant interfaces:

 Implementor  API Details
 Data-Literature Interlinking Service (OpenAIRE) http://dliservice.research-infrastructures.eu/#/api 
 DataCite Event Data  https://eventdata.datacite.org/api
 CrossRef Event Data http://api.eventdata.crossref.org/  

Read about how Scholix is being implemented in Elsevier's abstract and citation database, Scopus.