In order to integrate with the MultiversX Network and be able to broadcast transactions and query blockchain data in an optimized approach, one needs to set up an on-premises Observing Squad . An Observing Squad is defined as a set of N Observer Nodes (one for each Shard, including the Metachain) plus an MultiversX Proxy instance which will connect to these Observers and provide an HTTP API (by delegating requests to the Observers).

The snapshotless mode allows you to quickly synchronize with the network and perform Rest API calls for retrieving real-time data from the blockchain, such as getting data of an address (GET /address/${address}), getting the balance of an address (GET /address/${address}/balance), sending transactions, performing Smart Contract Queries and many more .
Full List of supported Operations can be found here : https://docs.multiversx.com/sdk-and-tools/proxy/#snaphotless-observers-support