Cross-venue consolidated best bid/ask (NBBO) API

Fetch top-of-book from Binance, Coinbase and Kraken in parallel and compute the consolidated NBBO — the highest bid and lowest ask across venues, the resulting spread, bps spread, mid price, and which venue leads each side, tolerating any single venue being down. The value-add is the cross-venue aggregation: best bid/ask aggregated from multiple venues, plus a crossed-book flag that surfaces cross-venue arbitrage. Answers 'best bid and ask for BTC-USD across exchanges', 'consolidated quote for ETH-USDT', 'is the book crossed between venues'.

Price$0.03per request

MethodPOST

Route/v1/markets/consolidated-quote

StatusLive

MIME typeapplication/json

Rate limit60/minute

Cache60s public

marketsquotenbbobid-askcryptofxconsolidatedorderbook

API URLhttps://x402.hexl.dev/v1/markets/consolidated-quote

Integration docs

Example request

{
  "pair": "BTC-USD"
}

Example response

{
  "pair": "BTC-USD",
  "consolidated": {
    "bestBid": 68011.5,
    "bestBidVenue": "coinbase",
    "bestAsk": 68013.2,
    "bestAskVenue": "kraken",
    "spread": 1.7,
    "spreadBps": 0.2499,
    "mid": 68012.35,
    "crossed": false
  },
  "venues": [
    {
      "venue": "binance",
      "bid": 68009.8,
      "ask": 68014
    },
    {
      "venue": "coinbase",
      "bid": 68011.5,
      "ask": 68015.1
    },
    {
      "venue": "kraken",
      "bid": 68010.2,
      "ask": 68013.2
    }
  ],
  "venuesUsed": 3
}

Input schema

{
  "type": "object",
  "required": [
    "pair"
  ],
  "properties": {
    "pair": {
      "type": "string",
      "minLength": 3,
      "examples": [
        "BTC-USD",
        "ETH-USDT"
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}