Crypto Market Breadth API
The health of the whole crypto market under the surface, computed live from Binance candles — no key, nothing stored. A market-cap index can be dragged up by two or three megacaps while everything else falls; breadth tells you how broad a move really is — how many coins are actually participating. The breadth endpoint scans a basket of liquid coins and returns the share trading above their 20-, 50- and 200-day moving averages (the classic participation gauges), the advancers versus decliners on the day with the advance/decline ratio, the average and median 24-hour change and a regime label (broad strength, mixed or broad weakness). The components endpoint returns the per-coin table behind it — each coin's price, 24-hour change and whether it is above each moving average — so you can see exactly which names are carrying the market. The symbols endpoint lists tradable pairs. This is the market-internals / breadth cut for crypto — distinct from the single-coin momentum, the movers/gainers, the fear-and-greed sentiment index and the price APIs in the catalogue. It answers "is this rally broad or narrow?", not "how is one coin doing?". The default basket is about 30 liquid majors; pass coins=BTC,ETH,... to customise (3-50 coins).
api.oanor.com/cryptobreadth-api
