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Hi @kris-toph,
Welcome to the forums!
Stress data from the relax app is not available through the Web APIs unfortunately. However, the community has expressed interest in seeing this data and we're currently tracking interest for it here: https://community.fitbit.com/t5/Feature-Suggestions/SpO2-EDA-Temperature-Breathing-HRV-in-WebAPI/idi...
If you are interested in seeing this data, please upvote the feature suggestions post I linked and share why you'd like to see this data so we can build a better case for it.
I hope this helps!
Best Answer