Adding Live Exchange Rates to a crypto portfolio tracker in 2026

The problem

Users expect to see prices in their own currency. Hard-coding rates goes stale fast. The fix is a single hourly-updated source of truth that your a crypto portfolio tracker can query.

The pattern

Fetch /api/v1/latest on a schedule, cache the rates map, and convert at display time. Store the rate's timestamp with each transaction so historical reports stay accurate.

Why it scales

Because conversion happens client-side from a cached map, your a crypto portfolio tracker makes only a handful of API calls per hour regardless of traffic — which keeps you comfortably inside the Free or Pro quota.