Appearance
Transactions
Transaction Filtering
Clients running a light client may wish to filter for transactions on a separate server, in which case LDK will tell them about transactions to filter for.
More information is available in the Blockchain Data guide.
Fee Estimation
LDK let's you decide your source for fee estimation. This could be Bitcoin Core's fee estimation through estimatesmartfee RPC method or third-party fee-estimators.
LDK's sample node implementation uses Bitcoin Core's fee estimation API here.
Transaction Broadcasting
You can broadcast transactions in a few ways, using Bitcoin core or other external API's
LDK's BroadcasterInterface docs
LDK's sample node implementation uses Bitcoin Core's transaction broadcasting API here.