Securities
Prices for shares, funds and ETFs, so a portfolio is valued at what it is worth rather than what you paid.
An investment portfolio holds instruments, and an instrument needs a price on every date the reports ask about. Walletguide fetches and stores those price histories for you.
How a holding is valued
You record what you bought, when, and at what price. The daily price series does the rest: the position's value on any date is quantity times that date's price, converted into the wallet's base currency at that date's exchange rate.
This is what makes the difference between cost and value visible, which is the number you actually wanted.
Gaps and non-trading days
Markets close. Where a date has no tick — a weekend, a holiday, a thin instrument — the last known price is carried forward rather than interpolated. A carried-forward price is the honest answer: it is what the thing was last worth, not a guess at what it would have been.
Adding an instrument
Search for it when adding a security transaction; the price history is fetched on demand the first time and kept current after that.
What it does not do
No live intraday prices, no order routing, and no broker connection. Walletguide values what you tell it you hold; it does not read your broker or trade on your behalf.