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Playground Template
Mortgage Calculator (sheets + fetchData rates)
Enter price + deposit; 'fetch_mortgage_rates' returns lender APRs; monthly payment auto-calcs.
fetchdatafinance
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Sheets
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Seed rows
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Keys
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AI models
Live preview
The actual playground rendered with seed data. Click around to try it; nothing is saved.
Playground contents
The sheets and keys this template will scaffold into your new playground.
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