Data sources & methodology
Every price, chart and calculated figure on this site comes from the sources below and is processed the way described here. If something looks wrong, tell us — we correct errors quickly.
Where prices come from
Stocks, stock indices, ETFs, futures, currencies and precious metals: Yahoo Finance market data. Depending on each exchange's licensing, quotes can be delayed by up to 15–20 minutes.
Cryptocurrencies: the OKX spot market, quoted against USDT, around the clock. Market capitalisation and supply come from CoinGecko.
Daily reference exchange rates for less-traded currencies: open.er-api.com. Where a live quote exists (for example USD/TRY, EUR/USD, EUR/TRY), it replaces the daily rate.
Crypto Fear & Greed Index: alternative.me. Blockchain statistics: public network nodes and mempool.space. News headlines: Yahoo Finance.
Real-estate figures are price per square metre in US dollars compiled from public statistics; every record carries its source and year. Map tiles © OpenStreetMap contributors and CARTO.
How often it updates
A dozen headline instruments (Bitcoin, Ether, gold, silver, EUR/USD, USD/TRY, the largest US stocks) are written to our database every 2 seconds, and roughly 140 tracked instruments every 8 seconds. Each upstream refresh is rate-limited so we stay within our providers' fair-use limits; when an exchange is closed its last price is kept rather than re-fetched.
Instruments outside the tracked list are fetched on demand and reused for up to a minute. Live pages show when their data was last updated.
How calculated figures are worked out
Gold and silver: prices follow COMEX front-month futures (GC=F, SI=F), which track the spot price closely. Gram prices divide the troy-ounce price by 31.1034768; lira prices multiply by the live USD/TRY rate. Turkish coins use their standard gross weights at 22 karat (0.916): quarter 1.754 g, half 3.508 g, full 7.016 g, Republic coin 7.216 g. These are spot-based values — jewellers and banks add workmanship and a spread.
Currency and crypto conversions cross through the US dollar: a coin's lira price is its USDT price multiplied by USD/TRY, with USDT and USDC taken at their 1-dollar peg. Local exchanges can trade at a small premium or discount.
Performance and risk metrics use closing prices: annualised volatility is the standard deviation of daily log returns over the past year multiplied by √252 (√365 for crypto); maximum drawdown is the largest fall from a running peak; beta and correlation use daily simple returns aligned by date; seasonality uses month-end closes from weekly bars.
Scores, projections and support/resistance levels are mechanical model outputs from historical data. They describe the past and are not forecasts or recommendations.
Independence and limits
investpig is free and carries no advertising or paid placements; no issuer or exchange pays to appear on it.
Market data can be delayed, incomplete or occasionally wrong, and nothing here is investment advice. Always confirm a price with your broker, bank or dealer before acting on it.
Spotted an error? Email info@investpig.com and tell us the page and the figure — we review every report.