Stellar's Protocol 28, known as “Adapter,” is now live on the Stellar mainnet following a validator vote held in September. The upgrade introduces a series of changes to Soroban smart contract management, data migrations, and the network's consensus process, and it arrives as the network records expanding activity in tokenized real-world assets and stablecoins. The development was detailed in a report published by Blockonomi on September 20, 2026.

According to recently published figures, tokenized assets on Stellar have reached about $3.3 billion, while stablecoin supply stands near $884 million. The activation coincides with that growth in on-chain asset activity, though much of the upgrade's practical effect will depend on adoption by developers and institutions.

Protocol 28 Adds Smart Contract Upgrade Tools

Protocol 28 is aimed primarily at developers and infrastructure operators rather than raw performance. A key change is CAP-85, which allows groups of smart contracts to be upgraded atomically. Contracts that share the same logic can be linked to an external code reference, and when an upgrade is required, the linked contracts move to the new version in a coordinated manner. Financial applications that manage large numbers of contracts may find maintenance and security updates simpler as a result, since each contract no longer needs to be updated individually. Atomic coordination addresses a failure mode familiar in conventional software operations: if contracts sharing the same logic drift across versions, transactions can end up processed against inconsistent code.

The upgrade also introduces CAP-86, which adds new “sparse” functions for data migrations. These functions let contracts handle missing or additional fields when a data structure changes. The goal is to make migrations more gradual and to reduce the risk of interruptions or incompatibilities. That gradualism matters for long-lived financial contracts, whose data structures may need to evolve without disrupting the records they already hold.

CAP-83 Consensus Changes and the 211 TPS Record

CAP-83, also included in the upgrade, modifies parts of Stellar's consensus process. Validators can move through certain consensus stages without waiting for all transaction data, and late or invalid transaction sets can be handled more efficiently. The aim is to keep the network resilient when transaction loads rise or data transmission is delayed. For a network historically centered on payments and cross-border transfers, that kind of resilience under load is what lets capacity gains carry over into day-to-day settlement.

Meanwhile, the network posted a new throughput milestone. In a post on X, Stellar XLM Holder cited Chainspect showing that Stellar sustained throughput above 211 transactions per second across 100 consecutive ledgers, a measure of sustained performance rather than a momentary peak.

Stellar (XLM): Protocol 28 Is Live as the Network Reaches a New Milestone

Stellar (XLM) has reached another important milestone in the evolution of its blockchain infrastructure. Protocol 28, known as “Adapter,” has officially been activated on the Stellar mainnet following a… pic.twitter.com/l8W24cXDe5

— Stellar XLM Holder (@SylvianGuibal) September 20, 2026

View the original post on X

The post notes that Protocol 28 alone does not account for the 211 TPS figure. Stellar is also rolling out parallel transaction-set downloading, which adds to processing capacity. The record therefore reflects a broader infrastructure effort, with Protocol 28 mainly targeting smart contract infrastructure, developer tools, data management, and network resilience.

Tokenized Assets, Stablecoins, and XLM Price Action

The upgrade arrives as real-world assets grow on the network. Stellar now hosts roughly $3.3 billion in tokenized assets, and the Stellar Development Foundation reported that RWAs passed $3 billion during the second quarter of 2026. The ecosystem covers tokenized bonds, U.S. Treasuries, money market funds, private credit, and tokenized gold. Portfolios of contracts tracking instruments like these are the kind of workloads CAP-85's coordinated upgrades and CAP-86's migration tools are built to maintain.

Stellar has historically centered on payments, cross-border transfers, and financial applications. With tokenization, the network is increasingly used to represent and transfer financial assets on-chain.

Stablecoins are also expanding on the network. Supply has reached about $884 million following the activation, and the assets support cross-border payments, international transfers, settlement, and liquidity. The Foundation also reported record stablecoin transfer volume of $11.4 billion in the second quarter of 2026.

XLM also traded higher around the upgrade, moving near $0.19 and reaching a local high near $0.203. The post cautions against linking the move directly to Protocol 28, noting that Bitcoin's price action, capital flows, regulation, liquidity, and RWA narratives also influence the market.

Adoption Is the Next Test

Developers still need to integrate the new capabilities, and several infrastructure improvements are rolling out progressively. The report adds that the real test is real-world usage by financial institutions, developers, stablecoin issuers, and RWA platforms. Going forward, observers are watching RWA growth, stablecoin supply, Soroban adoption, network throughput, and institutional activity.