Thanks! If you already have an aggregator contracts, you can pass in the API keys into our backend and we'll use that for new connections. We have many users who come in with existing aggregators and want to combine it with another one to improve coverage. Here's an example of the SDK initialization - https://docs.letsfuse.com/docs/fuse-sdk

We also partner with some of the aggregators, so if you wanted to combine your existing one with a new one, we can help you setup the contract with no effort on your end.

Our unified endpoints are also backward compatible, so if you pass in an aggregator access token instead of a Fuse access token it'll work as expected.

Happy to answer any other questions you have