Two assets side by side — price, market capitalisation, volatility, and how closely they have actually moved together over our stored history. Correlation is measured on daily returns rather than on prices, because two assets that both drift upward will look correlated on a price chart whether or not they are.
Want a pair that is not listed? Any two assets can be overlaid with the comparison tool. The pages above are the pairs with enough shared history for the correlation figure to mean anything — see the methodology.
Crypto — Near real-time. Aggregated across exchanges by CoinGecko and polled every 15 minutes.
Metals — Delayed. Front-month COMEX futures, published by Yahoo Finance about 10 minutes behind the exchange.
Forex — Daily reference rate. The European Central Bank publishes one reference rate per business day, around 16:00 CET. It is a reference, not a tradeable quote, and it does not move intraday.