@hfl - You can check out our Analytics Playground (GraphQL):
- Github: GitHub - iotexproject/iotex-analytics: The independent service that analyzes data from IoTeX blockchain
- Instructions Blog: IoTeX Analytics Playground is LIVE on analytics.iotexscan.io! | by IoTeX | IoTeX | Medium
- Instructions Video: https://www.youtube.com/watch?v=IHo1uE3RxQI
- Analytics Playground: https://analytics.iotexscan.io/