Matching entities across data sources using different identifiers and formats is a pervasive issue on the web.  This group revolves around developing a web API that data providers can expose, which eases the reconciliation of third-party data to their own identifiers. OpenRefine's reconciliation API is used as a starting point. Our goals are to document this existing API, share our experiences and lessons learnt from it, propose an improved protocol in the view of promoting it as a standard, and build tooling around it.  A description of the existing protocol can be found here: https://github.com/OpenRefine/OpenRefine/wiki/Reconciliation-Service-API