Inside the Layer 2 (L2) sector, 19 September 2026
A snapshot of 35 Layer 2 tokens tracked as of 19 September 2026, covering sector composition, fee coverage, and distance from all-time highs.
Sector Composition and Concentration
As of 19 September 2026, the Layer 2 sector tracked 35 constituents with a combined market capitalisation of approximately $8.95 billion. The 15 largest members listed here account for the bulk of that figure, and concentration is pronounced: the two largest constituents, OKB ($2.45 billion) and Mantle ($2.01 billion), together represent roughly half of the total sector market cap. The third-largest, Arbitrum at $1.45 billion, brings the top three to approximately 66% of the sector total. Members outside the top five fall off sharply, with market caps below $541 million, and the smallest listed constituent, SOON, sits at $64.3 million—a ratio of roughly 38-to-1 between the largest and smallest shown.
Fee Stream Coverage
Of the 15 constituents shown, 10 carry an annualized fee figure derived from the trailing 30 days to 19 September 2026, while 5 do not: Derive, Optimism, ADI, SOON, and Linea's data is present but Optimism and Derive show null values, meaning no fee stream is reported for those assets in this dataset. Among those with measurable fees, the figures span a wide range—from an annualized $5,439 for Immutable to $27.99 million for POL (ex-MATIC), based on the trailing 30-day annualization. The absence of a fee figure for several constituents does not itself indicate the absence of economic activity; it reflects only what this dataset captures.
Distance from All-Time Highs
The spread of drawdowns from all-time highs across listed constituents is substantial. At one end, ADI sits 0.92% below its all-time high as of 19 September 2026, and Derive is 24.2% below its peak. At the other end, Starknet is recorded at 99.0% below its all-time high, Optimism at 97.5% below, and Immutable at 98.6% below. Most of the listed members fall in the 91%–99% drawdown range, indicating that for the majority of constituents shown, current market capitalisations are a small fraction of prior peaks. OKB, at 48.97% below its all-time high, is a notable outlier relative to that cluster, sitting considerably closer to its peak than most peers in this list.
What the Sector Label Does and Does Not Convey
The Layer 2 label groups assets that share a broad technical orientation—operating as scaling or execution layers relative to an underlying base chain—but the category contains considerable structural heterogeneity. Some constituents are general-purpose rollups, others serve specific application domains such as gaming or derivatives, and the underlying base chains differ across members. Fee generation models, governance structures, and token utility vary materially. A reader should treat the sector grouping as a starting taxonomy rather than evidence of economic or functional equivalence among constituents. The aggregate market cap and return figures describe the collection as measured, not a homogeneous asset class.