Ask book reach
Updated
What is Ask book reach?
Ask book reach is a market-data metric BlackForge measures for every listed pair on nine spot exchanges, once per closed five-minute window. How far above the best ask, in percent, the order book we maintain actually reaches in this window. It reports what the order book or trade tape showed, not what price will do next.
The facts
| Unit | percent |
|---|---|
| Family | Depth bands |
| Key | askDepthReachPct |
| Quote-relative | No |
| Nullable | No |
| Plottable | Yes |
| Available from | Pro plan |
Live across all nine venues
Ask book reach for BTC-USDT, as measured in the latest closed window on each venue. Observed . A venue with no reading for this window shows an em dash — nothing is invented.
| Venue | Symbol | Ask book reach |
|---|---|---|
| Binance | BTCUSDT | 98.54 |
| Bitget | BTCUSDT | 0.6287 |
| Bybit | BTCUSDT | 1.08 |
| Coinbase | BTC-USDT | 1,096 |
| Gate | BTC_USDT | 5.51 |
| Kraken | BTCUSDT | 35.56 |
| Kucoin | BTC-USDT | 1,196,206,589,662,761 |
| Mexc | BTCUSDT | 79.33 |
| Okx | BTC-USDT | 0.3001 |
Query it
Ask book reach is one field on the wide row /v1/latest returns for a pair. Set $BF to the API base and read it at .values.askDepthReachPct:
curl -H "x-api-key: $BLACKFORGE_API_KEY" \
"$BF/v1/latest?exchange=binance&symbol=BTCUSDT"
# read the value at: .values.askDepthReachPctRelated
How much is resting on the book within fixed percentage distances of the price.
Defined in the glossary: Order book depth.
← All Depth bands and every other metric · Coverage by venue
What is Ask book reach?
Ask book reach is a market-data metric BlackForge measures for every listed pair on nine spot exchanges, once per closed five-minute window. How far above the best ask, in percent, the order book we maintain actually reaches in this window. It reports what the order book or trade tape showed, not what price will do next.
How is Ask book reach measured?
BlackForge computes Ask book reach from each venue’s own order book and trades for every listed pair, once per closed five-minute window, and records it as percent. The value is stored exactly as observed.
Which plan includes Ask book reach?
Ask book reach is available from the Pro plan upward, and on pay-per-call over x402. See pricing for the full plan ladder.
Does Ask book reach predict where price will go?
No. Ask book reach is a measurement of what the order book or trade tape showed in the window. It carries no view on future price, and BlackForge scores nothing — every metric is a measurement, not a call.