ETH/BTC ratio: the thermometer of rotation between Bitcoin and Ethereum

It is the chart that answers a question the dollar price never does: of the two large assets in the market, which one is doing better? Much of a crypto cycle strategy depends on that answer.

What the ETH/BTC ratio actually is

The ETH/BTC ratio is the price of Ethereum expressed in bitcoin: how many BTC you need to hand over to buy one ETH. It comes from an elementary division:

In practice there is no need to compute it: the ETH/BTC pair trades directly on the major exchanges, with its own order book, its own liquidity and its own chart. That chart is the interesting one, because it removes a variable from the equation. Looking at ETH in dollars mixes two things: what the crypto market is doing as a whole, and what Ethereum is doing inside it. The ratio separates the second from the first.

Put differently: the ratio is a measure of relative strength, not of performance. It does not say whether you are making or losing money, it says who is making more or losing less. That distinction, seemingly academic, decides how a portfolio is split.

Why it deserves its own chart

Bitcoin and Ethereum share much of their volatility. When the market sells off hard, both fall; when new capital arrives, both rise. That high correlation makes the ETH chart and the BTC chart look remarkably alike, and buries the differences —which are the interesting part— under the common move.

Dividing one by the other cancels that common move. What remains is the clean signal: the divergence between the two assets. That is why the ratio produces long, clean and surprisingly technical trends, with support and resistance respected for months, while the dollar price is doing something else entirely.

The four combinations you need to read

As with Bitcoin dominance, the ratio is only interpreted properly when crossed with the market's direction. There are four scenarios:

Bull market + rising ratio

Capital is inside the market and, on top of that, it wants risk. Ethereum is rising faster than Bitcoin. This is the classic environment for rotation into altcoins: if the ratio leads, the rest of the market usually follows.

Bull market + falling ratio

Money is coming in, but it is coming in through Bitcoin. This is the usual pattern at the start of a cycle and in phases dominated by institutional flows, which concentrate on the most liquid asset with the most settled regulatory framework. You make money in ETH, just less than you would holding BTC.

Bear market + falling ratio

Defensive phase. Within crypto, capital takes shelter in Bitcoin and altcoins bleed harder. Ethereum falls more than BTC. It is the typical combination of deep corrections and prolonged bear markets.

Bear market + rising ratio

The least frequent and the most interesting. Ethereum holds up better than Bitcoin in a hostile environment. It usually responds to a network-specific catalyst —a significant upgrade, a change in supply, a particular flow— and in some cycles it has front-run a change of trend.

The ratio and altseason: the rotation sequence

The sequence the market has repeated across its cycles is reasonably recognizable: Bitcoin rises first and dominance expands; Bitcoin then stalls near highs and capital starts looking for returns elsewhere; the first destination, by size and liquidity, is Ethereum; and only afterwards does rotation move down the capitalization ladder into the most speculative assets.

In that scheme the ETH/BTC ratio is the first domino. A sustained upturn in the ratio, with Bitcoin dominance falling at the same time, has been one of the early signals that rotation has begun. That both happen together matters: dominance can fall simply because stablecoins gain weight, whereas the ratio has no such bias.

Expectations should stay in proportion. The historical sample is four cycles, each with a very different market structure —ICOs in 2017, DeFi in 2020-2021, ETFs and institutional flows afterwards—. The pattern is a recurring observation, not a law. The halving cycle helps place which phase you are in before expecting the pattern to play out.

The ratio's peaks and what they meant

The all-time high of the ratio was recorded in June 2017, at the height of the ICO bubble, when most new projects raised funds by issuing tokens on Ethereum and traded against ether. Demand for ETH was not merely speculative then: it was functional, you needed ether to participate.

The second significant high arrived in December 2021, below the previous one, driven by the DeFi and NFT boom, which again generated real demand for block space on the network. The two peaks share a trait: they coincided with the most speculative phases of their cycles, not with Bitcoin's price top. Reading the ratio at highs as a sign of euphoria rather than strength has historically paid better.

Which technical indicators work on the ratio

The ratio is an ordinary price series and takes the same instruments as any other pair. What changes is what each signal means:

• RSI: measures exhaustion of the relative move. An oversold RSI on the ratio does not say ETH is cheap, it says its punishment relative to BTC has run a long way.
• MACD: particularly useful on weekly, where zero-line crosses have marked regime changes lasting months rather than short swings.
• Long moving averages: the 200-day or 50-week average on the ratio works as a regime boundary: above it, Ethereum leads; below it, Bitcoin leads.
• Bollinger Bands: periods of compression in the ratio —when both assets move almost identically— have preceded clear directional expansions.
• Supertrend: built for trends, it fits the ratio's behaviour well, since it tends to move in long sustained legs.

The golden rule holds: a bullish signal on the ratio is not a buy signal for ETH in dollars. It is a signal that ETH should behave better than BTC. In a falling market, that can mean losing less.

The Ethereum-specific variables that move the ratio

Bitcoin has a fixed monetary policy known down to the last satoshi. Ethereum does not, and that accounts for much of what makes the ratio move for reasons unrelated to the market:

Variable net issuance

Since EIP-1559 took effect in August 2021, part of every fee is destroyed. And since the move to proof of stake in September 2022, issuance of new ETH fell sharply. The result is that net ether supply depends on network activity: with heavy activity it can be negative; with light activity, slightly positive. It is a live variable Bitcoin does not have.

Supply locked in staking

A significant share of existing ether is deposited validating the network. That ether is not on the market. Changes in that share —and in how long it takes to enter or leave the validator queue— affect the supply actually available.

Layer 2 activity

Much user activity has moved to layer 2 networks. That is good for scalability and adoption, but it reduces the fees paid —and therefore burned— on the base layer. The Dencun upgrade of March 2024, which drastically cut the cost of posting data from layer 2, accentuated that effect. It is a structural factor with a direct impact on the supply equation.

Regulated product flows

Spot Bitcoin ETFs launched in the US market in January 2024; Ethereum's, in July of the same year. Six months of head start and a notably larger flow of inflows from the outset created a demand imbalance between the two assets that shows up in the ratio.

The mistakes that cost the most

• Confusing relative strength with performance. A rising ratio while the market collapses means losing money more slowly, not making it.
• Trading the ratio on short timeframes. Since both assets share volatility, on 15 minutes or 1 hour the chart is almost entirely noise. The ratio is read on daily, weekly and monthly.
• Expecting the altseason pattern to repeat identically. Four cycles with radically different market structures are not a statistical sample.
• Ignoring macro context. The DXY and liquidity conditions rule the whole risk market; the ratio describes the internal split, not the tide.
• Looking at the ratio alone. Crossing it with dominance and the Fear & Greed index gives a far more reliable read on rotation than any of the three on its own.

How to use it in practice

The most direct use is deciding the split between the two large assets in a portfolio. With the ratio in a sustained downtrend, the natural weight sits in Bitcoin; with the ratio turning up and dominance easing, increasing Ethereum's weight has historically been the position consistent with the rotation sequence.

The second use is timing: the ratio works as an early warning that the market is entering its risk-appetite phase. For anyone holding altcoins, that warning shows up on the ETH/BTC chart before it shows up in the altcoins' own price.

Frequently asked questions