Internal transactions are value transfers that occur inside a transaction during smart-contract execution. For EVM Streams, set includeInternalTxs to true when configuring the Stream to include matching internal transfers in the webhook payload's txsInternal array.
The delivered events still depend on the Stream's monitored addresses, contracts, chains, and filters. The setting does not turn a Stream into a complete historical trace of every call in a transaction. See the current webhook payload guide and Stream quickstart.