Portfolio and wealth dashboards live or die on whether the numbers agree. If the net-worth figure on the home screen does not match the sum of the holdings on the detail screen, users stop trusting the app, and trust is the whole product. The hard part is that those holdings span asset classes, and pricing them consistently from one source is what keeps the math honest.
The problem
Portfolio and wealth dashboards hold mixed books: equities, FX exposure, crypto, and sometimes commodities. Valuing them needs consistent prices and as-of history from one source, or the numbers across screens never agree.
How SiftingIO handles it
One feed marks every holding with consistent prices and deterministic as-of history, so net worth, allocation, and performance charts reconcile across the app. Snapshot reads value a portfolio on load, and historical OHLCV powers performance and time-weighted return charts.
Mark every holding from the same source
A mixed book of equities, crypto, FX exposure, and the occasional commodity is normally priced from several feeds, and the seams show up as totals that do not quite reconcile. Pulling every mark from one feed under one schema means the allocation chart, the net-worth total, and the per-position detail all derive from the same numbers. There is no reconciliation step between screens because there is nothing to reconcile.
Performance charts that reproduce later
Drawing a one-year return curve means valuing the book at many points in the past. SiftingIO's historical data is revision-tracked with deterministic timestamps, so an as-of valuation returns the same number every time you ask for it. A performance chart a user screenshots today still matches when they reopen the app next month, which matters more than it sounds for a product built on trust.
Start narrow, expand as users diversify
Most portfolio products launch covering one or two asset classes and add more as their users branch out. Because every market sits behind the same credential, adding equities or commodities later is a plan change rather than a re-integration. The valuation code you wrote for crypto holdings already handles the new asset class the day you enable it.