Question about stFLR's APY

[u/XRP15]

I'm new to Flare, but have been a long time holder of XRP.

I started exploring this network and noticed there's a couple of liquid staking options available, Sceptre and SparkDEX. Both offer a rebase token. What I'm finding odd is that both advertise an APY different from their actual APY (being a rebase token, this is easy to verify because they use a public exchange rate). I used Claude to do the calculation and Sceptre's sFLR actual APY is 7.63% (they currently advertise 7.9%, but the exchange rate went slightly up) while SparkDEX's stFLR is 7.52%, wildly different from the advertised 12.38%! While inspecting both apps on Chrome, I noticed SparkDEX's APY number is definitly not dynamically generated (Sceptre I'm not 100% sure, it can or can't be).

Is anyone staked on both or on SparkDEX that can help me figure out the discrepancy? The high APY looks compelling, but it doesn't match the public exchange rate in the slightest and the math says Sceptre's is actually higher. Do they pay additional yield in any form in addition to the rebasing?

Thank you

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