How it works

Two ways to ask “what if”. Here’s an example with ETH and BTC.

Market cap

What if ETH had BTC's market cap?

We give ETH the same market cap as BTC, then divide by the supply used for ETH. NOW uses the current market cap of BTC; ATH uses its historical high.

Peak ratio

What if ETH hit its peak BTC ratio?

We find the highest recorded ETH/BTC price ratio in our available daily history, then apply it to the price of BTC today. This shows what one ETH would cost if it regained that relative strength.

Use the question below your result to flip between the two modes.

What if A had B's market cap?

Select A
Select B
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BUIDL vs XAUT market cap comparison

As of Sep 17, 2026, if BlackRock USD Institutional Digital Liquidity Fund (BUIDL) had Tether Gold's (XAUT) market cap of $2.7B, one BUIDL would be worth $1.02, 1.02x its current price of $1.00.

At Tether Gold's all-time-high market cap of $3.43B (Jan 28, 2026), BUIDL would be worth $1.29 (1.29x).

Tether Gold is 1.02x the size of BlackRock USD Institutional Digital Liquidity Fund by market cap. The rank gap between them is 2 places.

The gap between BUIDL and XAUT widened 10.4% since Sep 17, 2026.

MetricBlackRock USD Institutional Digital Liquidity Fund (BUIDL)Tether Gold (XAUT)
Price (USD)$1.00$4,341
Market cap (USD)$2.65B$2.7B
Market cap rank#39#37
Circulating supply2.65B BUIDL622.82K XAUT
24h change0%+1.66%

Price of BlackRock USD Institutional Digital Liquidity Fund at Tether Gold's market cap: ($2.7B ÷ $2.65B) × $1.00 = $1.02.

Questions

What would BUIDL be worth with Tether Gold's market cap?
BlackRock USD Institutional Digital Liquidity Fund (BUIDL) would be worth $1.02 per coin with Tether Gold's market cap of $2.7B. That is 1.02x its price of $1.00 on Sep 17, 2026.
How many times would BUIDL need to grow to reach Tether Gold's market cap?
BlackRock USD Institutional Digital Liquidity Fund would need to grow 1.02x. Its market cap is $2.65B and Tether Gold's market cap is $2.7B.
How is the BUIDL price at XAUT's market cap calculated?
Price of BlackRock USD Institutional Digital Liquidity Fund at Tether Gold's market cap: ($2.7B ÷ $2.65B) × $1.00 = $1.02.

Data provided by CoinGecko. Refreshed daily. Last update Sep 17, 2026.