Optimism Approves Upgrade 20 for Superchain Interoperability
Optimism (OP)
Editor:
Eugene Serbin
cryptocurrency.com.tr reports that Optimism has approved Upgrade 20, a critical step toward enabling Superchain interoperability. The governance vote concluded on September 16, setting the stage for a contract upgrade on OP Sepolia, Ink Sepolia, Soneium Minato, and Unichain Sepolia. This testnet upgrade is targeted for September 17, with mainnet execution scheduled for September 24 pending a successful seven-day testnet soak.
The upgrade transitions the fault-proof system from Output Root Dispute Games to Super Root Dispute Games. This shift alters how OP Stack chains challenge incorrect state before withdrawals are finalized back to Ethereum. Optimism describes this change as a prerequisite for interoperability because Super Roots can eventually represent multiple chains at the same timestamp.
Although interoperability is a later step, Upgrade 20 keeps each chain’s dispute infrastructure separate. Each new game still contains the Output Root of a single chain. By making this transition now, Optimism aims to avoid modifying the security layer again when cross-chain interoperability activates.
How the market reacted
Whalio's own Binance spot order flow for OP, measured when this story was written up on 17 September 2026. Not the outlet's figures.
Optimism is trading at $0.09580 with a 24-hour buy ratio of 50.5%, indicating balanced market activity over the full day. However, the 1-hour buy ratio has dropped to 32.4%, suggesting that buying pressure is fading in the immediate short term. The 4-hour buy ratio sits at 50.7%, showing that buying interest remains stable over a slightly longer timeframe than the last hour. Volume Delta reflects this shift, with a positive $47,648 over 24 hours compared to a negative $35,098 in the last hour. CVD closed at -$13,164, indicating that selling pressure slightly outweighed buying pressure by the end of the period. Despite the short-term dip, spot volume reached $4,316,259 with 48,673 trades, showing active participation.
The latest daily buy ratio of 46.4% sits at the 5th percentile of the last 324 days, against a median of 50.1% - among the weakest buying days it has had.
Was that an ordinary day?
The same Binance spot measurements for OP, averaged over the days leading up to the story.
Over the preceding week, the average buy ratio was 52.0%, which is 1.5 points higher than the latest day's reading. This indicates that today's buying activity is slightly below the weekly norm. Volume was 0.88x the average, suggesting lower-than-usual trading intensity. The price has declined by 3.7% over the last eight days, with net buying occurring on only four of those seven days. Total Volume Delta for the week was +$1,747,301, contrasting with the current day's mixed delta signals.