The year-end closure usually concentrates one of the most sensitive moments for the crypto market: low liquidity, institutional balance sheet closures, and a strong presence of retail traders looking for the “last movement” of the year. The last week of December is no exception, and the pairs against Bitcoin —ETH/BTC, SOL/BTC, and XRP/BTC— serve as an excellent thermometer for the rotation between BTC and the main altcoins.
1. General context: Bitcoin as the axis
Before looking at each pair, it is key to understand two ideas:
When BTC dominates and rises more than the alts, ALT/BTC pairs tend to drop (even though the alt might still rise in USD).
When the market enters an "altseason" or mini-rotations, alts start performing better than BTC, and ALT/BTC pairs gain momentum upwards.
With this in mind, let’s look at each one.
2. ETH/BTC: the barometer of confidence in altcoins
Historically, ETH/BTC is the main benchmark to measure whether the market is willing to take on more risk in altcoins:
Typical year-end movement
In bullish cycle closures or recoveries, we usually see:
Bounces of ETH/BTC from key support zones (annual lows or range zones).
Or bearish breakouts if the focus remains solely on Bitcoin.
Technical keys to watch on TradingView
Supports and resistances on daily and weekly charts.
Moving average crosses (e.g., EMA 50 and 200).
Relative volume on days of major range expansion.
"During the first full week of December 2025, the ETH/BTC pair moved from an opening price of 0.033851 BTC on Monday, December 8, to a closing price of 0.034523 BTC on Friday, December 13, indicating a 1.98% appreciation of ETH against BTC during that period."
3. SOL/BTC: high beta and sensitivity to sentiment
Solana (SOL) against BTC typically behaves like a high beta asset: it exaggerates market movements, both up and down.
If sentiment is very positive:
What to highlight in the article:
Was there a breakout of a key structure (channel, triangle, range) in SOL/BTC?
Was the movement accompanied by spikes in volume?
Did it align with ecosystem news (DeFi, memecoins, NFTs, etc.)?
SOL/BTC was the star player with one of the most aggressive moves of the week, dropping from 0.00150410 to 0.00148120 BTC, showing an approximate variation of -1.52%, driven by positive news for the Solana ecosystem amid Bitcoin's widespread weakness.
SOL/BTC was the star player with one of the most aggressive moves of the week, dropping from 0.00150410 to 0.00148120 BTC, showing an approximate variation of -1.52%, driven by positive news for the Solana ecosystem amid Bitcoin's widespread weakness.
The following table details the daily movement of the pair during the week of December 8 to 13, 2025, reflecting high volatility:
Date Opening Price (BTC) Closing Price (BTC) Variation
December 8, 2025 0.00150410 0.00150560 +0.10%
December 9, 2025 0.00150620 0.00151150 +0.35%
December 10, 2025 0.00151180 0.00154320 +2.08%
December 11, 2025 0.00154330 0.00149650 -3.03%
December 12, 2025 0.00149720 0.00151330 +1.08%
December 13, 2025 0.00148130 0.00148120 -0.00%
📈 Market Dynamics and Possible Catalysts
The movement of SOL against BTC can be explained by a combination of asset-specific factors:
Momentum for Solana (SOL): During the week, key advancements for the ecosystem were announced, such as the final deployment of the Firedancer validator client—promising higher performance—and the arrival of wXRP to its network, enhancing interoperability. Additionally, Coinbase enabled direct token swaps for Solana on its decentralized platform. These announcements generated specific positive sentiment for SOL.
Pressure on Bitcoin (BTC): Meanwhile, Bitcoin faced macroeconomic pressures. Markets were nervous about expectations regarding artificial intelligence, dragging down U.S. tech indices and risk assets like Bitcoin. Moreover, there was uncertainty about the Federal Reserve's future interest rate decisions.
In summary, the movement of SOL/BTC reflected a capital rotation from Bitcoin, which faced macroeconomic doubts, towards Solana, which presented its own bullish tech narratives.
4. XRP/BTC: regulatory narrative and more defensive behavior
The XRP/BTC pair is often heavily influenced by:
Regulatory news.
Decisions from major exchanges.
Speculative flows following legal announcements.
For the XRP/BTC pair, the most recent data available corresponds to the week of December 8 to 13, 2025.
This week was marked by significant turbulence in the market. On Friday, December 13, Bitcoin recorded its largest daily drop since March, with a nearly 6% decline. This event allowed us to observe how different cryptocurrencies behaved:
In quiet weeks, XRP/BTC sometimes acts almost like a defensive alt: it moves less than other high beta tokens like SOL. This behavior was confirmed during the volatility of December 13. While Solana (SOL) plummeted more than 9% against Bitcoin during the massive sell-off, the XRP/BTC pair showed remarkable resilience.
"The week culminated with one of Bitcoin's most aggressive declines in months, dragging down high beta altcoins like Solana (-9%). In contrast, XRP/BTC demonstrated its defensive profile, navigating the week with relative calm: the pair moved from 0.00002287 to 0.00002253 BTC, recording a moderate variation of -1.5%. This movement suggests a possible rotation of capital from more volatile assets towards relative havens within the altcoin ecosystem during panic episodes."
For a more detailed view, below is the daily movement of the XRP/BTC pair during that week:
Date Closing Price (BTC) Daily Variation
December 8, 2025 0.00002287 BTC +0.97%
December 9, 2025 0.00002273 BTC -0.62%
December 10, 2025 0.00002221 BTC -2.33%
December 11, 2025 0.00002201 BTC -0.88%
December 12, 2025 0.00002225 BTC +1.07%
December 13, 2025 0.00002253 BTC +1.30%
📊 Context for your analysis
Volatility comparison: Solana's drop (>9%) was over six times greater than the total weekly variation of XRP/BTC (-1.5%). This substantial difference is key to supporting the "defensive haven" thesis.
Market context: The massive sell-off was driven by global uncertainty, leveraged trading, and regulatory concerns, resulting in over $400 million in liquidations. In this environment, assets perceived as less risky tend to attract capital.
XRP narrative: Despite market pressure, XRP had fundamental support: XRP spot ETFs had attracted nearly $850 million in inflows since their launch in mid-November, showing strong underlying institutional demand. This could explain part of its relative resilience.
"XRP/BTC remained relatively stable during the week of December 8 to 13, oscillating between 0.00002200 and 0.00002300 BTC, suggesting that the market views XRP as a speculative chip but without massive rotation from BTC towards the asset."
5. Conclusions: what these pairs tell us about the start of next year
If ETH/BTC rises and SOL/BTC also:
Signal that a phase of greater risk appetite in altcoins could be starting (or continuing).
If ETH/BTC falls and SOL/BTC crashes:
The market continues to prioritize Bitcoin as a safe haven, and any bounce in alts could be just technical.
If XRP/BTC remains strong while others fall: