ETH liquidity sinks below half of BTC

TLDR

Ethereums spot liquidity has weakened relative to Bitcoin, even as ETH price performance has recently outpaced BTC.

1. CoinGecko finds Ethereums median order book depth now at roughly 35 to 45 percent of Bitcoins, down from at least 60 percent a year ago.
2. Bitcoins depth has grown while Ethereums stayed flat, so large ETH trades face more slippage and volatility than comparable BTC trades even though everyday orders remain manageable.
3. The key variables to watch are ETH order book depth, ETF flows, and market maker behavior, which will determine whether this liquidity gap narrows or becomes a lasting structural feature.

Deep Dive

1. How Big The Liquidity Gap Is

A recent CoinGecko analysis across eight centralized exchanges measured order book depth very close to the mid price, about 0.15 percent away.

By that measure, Ethereum (ETH) has median depth around 13 to 14 million dollars, while Bitcoin (BTC) has about 29 million dollars on the bid side and 37 million dollars on the ask side. That puts ETH at roughly 35 to 45 percent of BTCs liquidity in this tight band, versus at least 60 percent in the comparable 2025 period.

At the market level, BTC still dominates with roughly 59.09 percent of total crypto value, while ETH sits near 11.31 percent, showing Bitcoin remains the deeper and larger base asset.

2. Why ETH Liquidity Lagged BTC

Reports from CoinDesk and others note that ETH gained about 70 percent in Q3 2026, beating BTCs roughly 42 percent gain, yet its order books did not deepen in step. Instead, CoinGeckos report shows ETH depth stayed roughly flat while BTC depth improved, mechanically driving the ratio lower.

One driver is structural demand for BTC via spot ETFs, which remain much larger than ETH ETFs. Bitcoin funds still hold around six times more assets than Ethereum funds, according to ETF flow data, anchoring deeper BTC order books on major venues.

Market makers appear to have committed more capital around BTC books, while ETHs rally was powered by price and ETF inflows without the same expansion in resting liquidity.

3. What To Watch Next

There are a few key metrics to monitor to see if ETHs liquidity recovers. First is ETHs order book depth ratio to BTC in the same tight price band, which will show whether market makers are adding inventory closer to the price.

Second is relative ETF behavior. If spot ETH ETFs continue to attract stronger incremental inflows while BTC flows cool, that could incentivize deeper ETH books over time; if BTC ETF momentum stays dominant, the gap may persist.

Third is derivatives and altcoin rotation signals. ETH has occasionally overtaken BTC in open interest on venues like Hyperliquid, showing trader engagement even as spot depth trails, but that leverage can amplify both rallies and drawdowns in a thinner cash market.

Confidence: high because multiple independent reports cite similar ETH to BTC depth ratios over the same period.

Conclusion

Ethereums liquidity being only around one third to one half of Bitcoins reflects a structural tilt in market depth toward BTC, even after ETHs stronger recent price run.

If ETH order books deepen alongside ETF growth and continued adoption, the gap could narrow, but for now BTC remains the more liquid base asset and ETH traders should plan around higher execution risk on large moves.