BTC / Dollar Index Correlation
Rolling 90-day Pearson correlation between Bitcoin and trade-weighted US Dollar Index daily returns, bounded -1 to +1. Historically the relationship has often been inverse: a strengthening dollar tends to coincide with weaker BTC regimes, while dollar downtrends have accompanied risk-on phases. The reading describes the current regime; it does not predict it.
What is it?
This metric computes the rolling 90-day Pearson correlation between Bitcoin daily returns and trade-weighted US Dollar Index daily returns. The formula is correlation(returns_btc, returns_dxy) over a 90-day rolling window, bounded between -1 and +1. Correlation is computed on returns, never on price levels, because level correlation between two trending series is statistically spurious. The dollar index series is published on a business-day cadence with a short publication lag (typically one to a few days), so the latest reading reflects the most recent jointly available observations.
How to read
The chart displays three series: the correlation line bounded between -1 and +1 (primary), the Dollar Index level and the BTC price for context. A zero line marks the neutral boundary. Sustained readings below zero describe an inverse regime (dollar up, BTC down and vice versa); readings around zero describe decoupling; sustained positive readings describe co-movement. The BTC overlay renders on a separate logarithmic axis so the correlation scale is never compressed.
Key zones
Readings below -0.35 have historically marked strong inverse regimes where dollar strength coincided with BTC drawdowns, with historical extremes near -0.63. The band between -0.2 and +0.2 is the decoupling zone where BTC trades on its own drivers. Readings above +0.20 are historically rare and short-lived for this pair (the observed ceiling sits near +0.35) and deserve attention when they appear, as they depart from the long-run inverse tendency.
What to observe
Watch regime transitions rather than single readings: a correlation crossing from the inverse zone toward zero often accompanies macro narrative shifts (liquidity turning, dollar cycle turning). Compare with the Dollar Cycle Detector: when the dollar enters a downtrend phase while the correlation is deeply negative, the historical record shows BTC has tended to benefit from that configuration. Persistence matters: several weeks in a zone is a regime, a few days is noise.
Historical context
Across past cycles the BTC and dollar relationship has alternated between marked inverse phases (notably during broad risk-on expansions and during acute dollar strength episodes such as the 2022 tightening cycle) and long decoupling stretches. The inverse tendency strengthened as BTC became more integrated with global liquidity conditions, a shift visible from the 2020 to 2022 period onward.
Expert notes
Pearson correlation on 90-day returns captures linear co-movement only: tail dependence and lead-lag structure require complementary tools. The window choice is a bias-variance trade-off: 90 days balances regime detection speed against noise. The BTC price series comes from a self-hosted full Bitcoin node pipeline updated daily, so the latest correlation point carries up to one day of lag by design.
Common mistakes to avoid
Correlation describes co-movement, it does not predict direction: a deeply negative reading says nothing about whether the dollar will rise or fall next. Correlation is not causation: both assets respond to common liquidity forces. Do not read a single day spike as a regime change. Do not use this reading alone as an investment decision input; it is one contextual lens among the cross-asset set.
Programmatic access
REST API
curl -sS \
'https://api.trinityinsights.io/api/v1/macro-intelligence/macro-v2-corr-btc-dxy/history?days=90' \
-H 'X-API-Key: $TRINITY_API_KEY'MCP server
{
"tool": "get_chart_value",
"metric_id": "macro-v2-corr-btc-dxy",
"timeframe": "1y"
}Required tier: pro. See the pricing grid for the tier list and the MCP documentation for multi-client configuration.
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Institutional disclaimer
Trinity Insights is an educational and analytical tool. The metric above does not constitute investment advice. Trinity Insights is not a Crypto-Asset Service Provider (CASP) registered under MiCA Regulation (EU) 2023/1114. See the full disclaimer.