#price-comparison

Live crypto cross-exchange price comparison and arbitrage spread — the spot price of a coin on the major centralised exchanges at once, served straight from each exchange's public ticker. For any base coin it fetches the spot price from Binance, OKX, Bybit, KuCoin and Coinbase in parallel, returns the per-exchange price table, identifies the cheapest venue to buy and the most expensive to sell, and computes the spread between them — absolute and percentage — the headline cross-exchange arbitrage gap. Get the full price table, the best buy/sell opportunity, or the list of exchanges. Live, no key, no cache. Quotes are USDT (Binance/OKX/Bybit/KuCoin) or USD (Coinbase), within a few basis points. A price-discovery and arbitrage layer for trading, analytics and dashboard apps. Distinct from single-exchange price and OHLC APIs — this is the cross-exchange arbitrage view.

api.oanor.com/cryptoarbitrage-api

Unit-price and best-value maths as an API — the supermarket "which is cheaper" calculation, computed locally and deterministically and entirely currency-agnostic. The unit endpoint normalises a pack price to a price per standard unit: from a price, a pack size and its unit (and an optional multipack count) it returns the price per kilogram, per 100 g and per pound for weight; per litre, per 100 ml and per fluid ounce for volume; or per item for counted goods — plus the price per pack item for multipacks. The compare endpoint takes several pack options as a simple list (such as "3@500g,5@1kg,4.5@750g"), ranks them cheapest-per-unit first, names the best value and reports the percentage saving versus the most expensive. The convert endpoint turns a unit price given in one basis (for example per pound) into the other bases for its measure. Everything is computed locally and deterministically, so it is instant and private. Options being compared must share a measure (all weight, all volume or all count). Ideal for shopping and grocery apps, price-comparison and deal sites, budgeting tools, and retail and procurement software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is unit-price comparison; for profit margin and markup use a margin API.

api.oanor.com/unitprice-api