Field Notes · 12 March 2026
Dating every APY you paste into the calculator
Why a retrieval date belongs next to every stablecoin rate before Smart Crypto Calculator PC runs a projection.
A yield page that looked correct on Monday can quietly change by Thursday. When you paste an APY into Smart Crypto Calculator PC without a retrieval date, the projection ages badly — you cannot tell whether a later mismatch came from maths or from a revised programme.
A simple habit
Keep a one-line source note: ticker, APY, compounding claim, URL or statement ID, and the calendar day you captured it. Store the note in the calculator workspace description field if the build allows, or in the export filename.
What we refuse to model
Rates attributed only to a chat screenshot with no programme name. Figures that mix borrowing APY with earning APY. “Up to” marketing bands without a tier table for your balance size.
Session tip
Send source notes the evening before a personalised yield projection. We spend the meeting on scenarios instead of reconstructing where a number came from.