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.

Market cap flips · top 500

Top 500 market cap flips on Sep 16, 2026

The tightest market cap races in the top 500 right now. From tomorrow, this page shows who flipped whom.

A flip is when one coin's market cap passes another's between two daily snapshots. Only flips that leave a gap of at least 2% and involve two top-500 coins are listed, so coins trading places every day do not flood the list. A flip that reverses the next day stays on the record and is marked.

Data provided by CoinGecko. Refreshed daily. Last update Sep 16, 2026.