#precious-metals

The ratios between gold, silver, platinum and palladium, where they sit in their own multi-year history, and which metal is cheap relative to which — computed live from Yahoo Finance futures, no key, nothing stored. A precious-metal price tells you what an ounce costs; the ratio between two metals tells you which is expensive relative to the other — and these ratios are famously mean-reverting, which is why the gold/silver "mint ratio" is one of the oldest trades there is: when it stretches to an extreme, traders rotate from the dear metal into the cheap one and ride it back. A single current ratio is only half the story; what matters is where that ratio sits in its multi-year range. This API computes the gold/silver, gold/platinum, platinum/palladium, gold/palladium and silver/platinum ratios, and for each returns its current value, its percentile within a multi-year window (the context that turns a number into a signal), the window min/max/average, and a plain-language rotation read — at a high percentile the numerator metal is historically expensive (favour the denominator), at a low percentile the reverse. The ratios endpoint returns the whole complex; the ratio endpoint returns one pair with its component prices; the history endpoint returns the ratio time series. This is the precious-metal-ratio / mean-reversion cut — distinct from the inter-commodity crack/crush spread API (which gives the current gold/silver ratio but no history, percentile or signal), the intermarket-ratio board and the metals spot-price feed. It is the ratio with its history attached.

api.oanor.com/preciousratios-api

Live official exchange-rate data from the Central Bank of the Republic of Azerbaijan (CBAR), the central bank of Azerbaijan, for the Azerbaijani manat (AZN) — uniquely also publishing official bank metal prices: the CBAR official rate for every published currency (normalised to one unit), a single currency's manat-per-unit rate and inverse, the official price of gold, silver, platinum and palladium per troy ounce in manat, and currency conversion between any two published currencies (including AZN) cross-computed through the manat.

api.oanor.com/cbar-api

Live precious and industrial metal spot prices as an API — gold, silver, platinum, palladium and copper — with optional currency conversion via European Central Bank rates. Get the live USD spot price of any metal and convert it into any major currency; list them all at once; compute the value of a quantity of metal; or read the classic gold/silver and gold/platinum ratios traders watch. Built for trading, jewellery, treasury and dashboard apps. The commodities and precious-metals layer, live and key-free — distinct from generic ticker-quote APIs.

api.oanor.com/metals-api

Gold purity and karat maths as an API, computed locally and deterministically — the karat, fineness and alloy numbers a jeweller, goldsmith, assayer or refiner works to. The karat-to-fineness endpoint converts between the two purity systems: karat is the number of 24ths of a piece that is pure gold, so the fineness (parts per thousand, the figure on a hallmark stamp) = karat ÷ 24 × 1000 and the gold percentage = karat ÷ 24 × 100 — 24K is pure (1000‰), 18K is 750‰ (75 %), 14K is 583‰, 9K is 375‰. The pure-gold-weight endpoint gives the actual fine gold in a piece = its total weight × the gold fraction (karat ÷ 24): a 10 g 18K ring holds 7.5 g of gold and 2.5 g of alloy, the fine-gold content a refiner pays on and the basis of the intrinsic metal value. The alloy-mix endpoint inverts it for the bench: to bring refined fine gold down to a target karat, the total weight = the fine gold ÷ (target karat ÷ 24) and the alloy to add = the total − the fine gold, so 7.5 g of pure gold makes 10 g of 18K with 2.5 g of master alloy. Everything is computed locally and deterministically, so it is instant and private. Ideal for jewellery and goldsmithing tools, pawn and scrap-gold apps, and assay and metal-value calculators. Pure local computation — no key, no third-party service, instant. Purity maths only — it does not fetch the live gold price. 3 compute endpoints. For a metal part's weight from its dimensions use a metal-weight API.

api.oanor.com/goldpurity-api