Ethereum (ETH) is 903.6× the size of Sei (SEI) by market capitalisation. Over the past 1 year, ETH is ahead by 42.9 percentage points (SEI -69.2% against ETH -26.2%). Their daily returns move closely together (correlation 0.70 across 399 shared trading days). SEI has been the more volatile of the two, at 82% annualised against ETH's 62%.
SEIETH
0.70over 399 shared trading days
Measured on daily returns rather than on prices. Two assets that both simply trend upward score near 1.0 on raw prices whether or not they move together, so returns are what answer the question people mean by correlation.
| Metric | SEI | ETH |
|---|---|---|
| Max drawdown (400d) | -87.2% | -66.5% |
| Risk-adjusted return (90d) | 0.21 | 0.50 |
| Best 30 days (past year) | +71.1% | +34.1% |
| Worst 30 days (past year) | -44.9% | -44.6% |
Relative strength over 90 days: ETH outperformed SEI by 7.3% — measured on the SEI/ETH ratio, so it holds regardless of market direction.