Arbitrum vs Optimism
Arbitrum (ARB) is the larger of the two, worth 4.2× Optimism's market cap as of 13 September 2026. Compare ARB and OP on price, market cap, supply and performance below.
Arbitrum vs Optimism
Lines are normalized to the % change from the start of the visible range, so coins with very different prices stay visually comparable.
| Metric |  ARB |  OP |
|---|---|---|
| Price (USD) | $0.140053 | $0.096936 |
| Market cap | $935.28M | $222.92M |
| 24h volume | $122.48M | $29.95M |
| Market cap rank | #62 | #123 |
| 1h change | +0.93% | +0.08% |
| 24h change | -1.38% | -0.20% |
| 7d change | -25.73% | -12.05% |
| 30d change | +87.21% | +13.04% |
| All-time high | $2.39 | $4.84 |
| % from ATH | -94.14% | -98.00% |
| Circulating supply | 6.68B ARB | 2.3B OP |
| Max supply | Uncapped | 4.29B OP |
| Listed exchanges | 20 | 20 |
Data as of 13 September 2026
How Arbitrum and Optimism differ
Size. Market cap, not price, is what ranks these two against each other. Arbitrum carries the larger market cap of the pair — 4.2 times Optimism's. A lower price per coin says nothing about which is the bigger asset, only that the supply is divided differently.
Supply. Compare circulating supply against max supply for each. The coin with most of its supply already issued faces less future sell pressure from unlocks and emissions than one still releasing.
Liquidity. 24-hour volume measured against market cap shows how actively each trades. Thin volume means wider spreads and sharper moves in both directions, whatever the market cap says.