How to Connect

Users running on-premise node have two options to connect their node to the BDN:
1.On-premise Gateway 
2.Hosted Gateway 
Users that want to quickly send transactions to the BDN or stream transactions/blocks to their application have two options:
1.Work with the Gateway-API (On-premise Gateway or Hosted Gateway) 
2.Cloud-API 
On-premise Gateway
An On-premise Gateway peers with the user's node to quickly propagate both blocks and transaction to the node. 
Hosted Gateway
A Hosted Gateway is similar to running an On-premise Gateway, yet users conveniently do not need to locally host and manage the Gateway.
To connect to a Hosted Gateway, please follow the instructions available here.
Cloud-API
The Cloud-API supports sending Ethereum transactions fast and subscribing to Transaction Streaming and Blocks Streaming.
Gateway vs Cloud-API
As explained above, if a user runs their own node and wishes to connect it to the BDN, they will need to connect a Gateway to the node (either an On-premise or Hosted Gateway). 

As a rule of thumb, if a user decides to connect a Gateway to their node, it is better to use the Gateway-API to send transactions and stream data. If they do not have a Gateway installed, they can decide to use the Cloud-API instead of installing a Gateway. Users that require the best performance may decide to use both the Gateway-API and Cloud-API. 

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Gateway vs Cloud-API