EOS Tribe have been working on building public web scalable History API service.
We have used Elasticsearch plugin by EOSLaoMao:
https://github.com/EOSLaoMao/elasticsearch_plugin
We had to re-index data in Elasticsearch cluster and build our own API layer:
https://github.com/EOSTribe/ESHistoryAPI
We currently only support get_transaction and get_actions methods and working on adding remaining two methods.
EOS Tribe still exposes native History API on /v1/history/* while making new Elasticsearch API available on /v2/history/*
The response JSON is slightly different on Elasticsearch API.
It's available on https://api.eostribe.io/v2/history/*
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