Bedrock pricing - Is there any additional cost for the service apart from the models pricing?

Hi, We are considering using AWS Bedrock to test some of the integrated models (Titan, Llama, Claude etc). Before kicking off, we would like to know if there are any additional for using Bedrock apart from the Pay-per-token or throughput models? We'd probably start with pay per token, but before we do we want to know 100% we will not be additionally charged so we will not deviate from our estimated cost per session.