feat: add USDC price converter utility and PriceTag component - #1173
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feat: add USDC price converter utility and PriceTag component#1173Dami24-hub wants to merge 1 commit into
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- utils/usdc-rate.ts: fetchUsdcRate() hits CoinGecko for live USD/EUR rates with a 5-minute in-memory cache; convertUsdcToFiat() applies safe fixed-point rounding. Gracefully falls back to 1.00 USD / 0.92 EUR when the API is unreachable, propagating an isFallback flag. - components/ui/PriceTag.tsx: "use client" React component that displays an amount in USDC (2 d.p.) with the approximate fiat equivalent beneath it. Features a pulse-skeleton loading state, an (est.) annotation when rate data is unavailable, and an accessible aria-label. - __tests__/usdc-rate.test.ts: 12 vitest unit tests covering conversion math, successful API responses, and all fallback branches. - __tests__/price-tag.test.tsx: 11 vitest + Testing Library tests covering USDC display, fiat conversion, loading state, fallback annotation, and accessibility label. All 23 tests pass; 0 lint errors; 0 TypeScript errors in new files.
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Description
This pull request introduces the new PriceTag display component along with a reliable USDC fiat rate-fetching utility, fulfilling the requirements for the Utilities module.
Changes Made
USDC Rate Fetching Utility: Implemented a robust function to fetch live USDC-to-fiat exchange rates (USD/EUR) with built-in fallback handling for network errors or API failures.
PriceTag Component (PriceTag.tsx):
Displays the primary amount in USDC formatted consistently to two decimal places (e.g., 25.00 USDC).
Renders a secondary, smaller conversion text showing the value in fiat beneath it.
Includes a graceful fallback display note if rate fetching fails.
Precision & Formatting: Ensured precise decimal handling to completely eliminate rounding errors.
Acceptance Criteria Checklist
[x] Implemented function to fetch current USDC rate relative to fiat currencies.
[x] Created PriceTag.tsx component receiving an amount in USDC.
[x] Displays primary price in USDC and secondary fiat conversion beneath.
[x] Conversion handling avoids rounding errors (prices formatted to two decimal points).
[x] Displays a fallback conversion note if rates fetching fails.
[x] Code is fully typed, formatted, and builds successfully.
[x] Branch created and pushed to GitHub.
closes #1018