One of my favorite aspects of using Hive-Engine is their API support.
https://hive-engine.github.io/engine-docs/tables/
You can post your own transactions on the Blockchain and they will be processed by Hive-Engine. For example, I can transfer a second layer token to another HIVE user by sending a Custom-JSON request to HIVE and using a specific ID (ssc-mainnet-hive) and formatted JSON data. This blockchain request is then streamed and processed by Hive-Engine, even though I did not send the request from their interface.