Transparency in crypto exchange data is a growing concern. Many comparison sites rely on proprietary data feeds that can be manipulated or delayed.

An interesting approach I have seen is building aggregators that pull directly from exchange APIs and present the data without editorial bias. btc66.me takes this route - comparing fees, features, and supported assets across 60+ exchanges with real-time data.

What open-source tools or frameworks have you seen for aggregating and comparing financial service data? Would love to hear about similar projects.