Bitbase BTCUSDT mark price on ETF outflows: mark, not last, through the Binance withdrawal reopen

Monday's market gave a good reason to look at the difference, with BTC sliding under 77,000 after a heavy week of news.

What is driving the tape

Two stories are overlapping.

First, US spot bitcoin ETFs lost $643.3 million on Friday, their biggest daily outflow since June 25 and enough to erase four days of inflows. The largest exits were about $233.7 million from IBIT and $201.4 million from FBTC.

Second, Binance reopened withdrawals in phases after its $6.3 billion hack. It reported $4.65 billion withdrawn against $1.01 billion deposited, a net $3.64 billion outflow, and said it has covered around 95% of the stolen funds. Futures volume across crypto rose 56% to $111.8 billion while open interest stayed near $137.1 billion. BTC open interest was flat. ETH looked similar. Meanwhile BNB open interest fell 5.31%, RUNE dropped 6.4% on the Thorchain freeze debate, and NEAR led losses with a 5.93% drop.

Analysts at QCP described 76,000 to 76,600 as a support band and 79,500 to 80,500 as resistance. Those are levels other traders are watching, not a forecast.

Separately, Bitbase upgraded to Bitbase 2.0 today, a brand and product refresh across the app and website.

The live contract

Bitbase public market data for BTCUSDT perpetual, 3:53 PM ET, Nov 2:

• Last 76,895.1
• Mark 76,893.1
• Index 76,876.06
• 24h open 77,871.5, high 78,853.5, low 76,670.2, change -1.25%
• 24h quote volume about 161 million USDT
• Funding 0.0200% per 8 hours, limits plus or minus 2%, next settlement 7:00 PM ET

Bitbase's public ticker data does not include an open interest figure, so positioning comes from the market-wide numbers above.

How Bitbase builds the mark price

Bitbase's help center lays out the method:

1. Every second, it takes the futures best bid, best ask and the index price
2. Basis = (best bid + best ask) / 2 - index
3. It averages the basis over the latest 30 one-second samples, giving recent samples more weight
4. Mark = index + that moving-average basis, updated every second

Liquidation is triggered by mark, not last. A short wick on last that mark does not follow will not liquidate you. A move that mark does follow will, even if last never touched your displayed liquidation price.

Worked example with today's numbers

Basis right now: 76,893.1 - 76,876.06 = 17.04 USDT, about 0.022% above index. The perp is trading a touch rich, consistent with longs paying positive funding.

Take a 0.01 BTC long.

• Position value at mark: 0.01 x 76,893.1 = 768.93 USDT
• Funding at 0.0200%: 768.93 x 0.0002 = 0.154 USDT per settlement, about 0.46 USDT per day
• VIP0 futures fees, maker 0.02% and taker 0.06%: opening and closing with taker orders costs 768.93 x 0.0006 x 2 = 0.92 USDT, about six funding payments
• PnL gap between last and mark: 0.01 x (76,895.1 - 76,893.1) = 0.02 USDT. Tiny now, but on a fast candle the gap widens

Leverage versus range: (78,853.5 - 76,670.2) / 76,670.2 = 2.85%. At 10x the cushion is under 10%, so the day's range used less than a third. At 40x the cushion is under 2.5%, inside the range.

What happens if margin runs out

The help center describes the sequence once the maintenance margin ratio reaches 100%: open orders are cancelled, hedged positions are netted, the position may be partially liquidated, and then the insurance fund and auto-deleveraging handle any shortfall. Cross and isolated margin trigger differently, so check which mode you are in.

Common mistakes

• Setting a stop on last price and assuming liquidation works the same way
• Ignoring basis. When the perp runs rich, longs pay more funding
• Treating ETF outflow headlines as a reason to max leverage in either direction
• Forgetting that the estimated liquidation price moves as mark, fees and unrealized PnL change

FAQ

Why can my liquidation price change if I did nothing?

Bitbase recalculates it from mark, risk tier, unrealized PnL and fees, so it shifts as those move.

Is a 17 USDT basis large?

No. About 0.022%. Watch the trend in basis more than one reading.

Mark price is the number that decides your position. Learn to read it before you need it.