Cardano Releases Rosetta Java v2.1.0 with Conway Support

• Cardano Rosetta Java v2.1.0 adds full Conway governance support, including SPO voting and DRep vote delegation across endpoints.
• Cardano’s stablecoin supply climbed to $47.7 million, pushing the stablecoin-to-TVL ratio to 33.87% after USDCx growth on the network.

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The Cardano Foundation has released Cardano Rosetta Java v2.1.0, expanding Rosetta support for Conway-era governance activity. The update brings full support for governance operations to both construction and data endpoints. This lets wallets and services create and read governance-related transactions through the Rosetta interface.

Rosetta Java v2.1.0 enables stake pool operators and developers to use features tied to on-chain governance, including stake pool operator voting and DRep vote delegation. These governance actions now appear consistently across endpoints, which supports integration work for applications that track governance actions alongside standard transaction data.

Cardano Rosetta Java v2.1.0 is live.

Full Conway-era governance support is now available across construction and data endpoints — SPO Voting, DRep Vote Delegation, CIP-129, and more.https://t.co/KmfDN4tVm2

— Cardano Foundation (@Cardano_CF) March 1, 2026

The release is not mandatory, but it targets teams that want stronger compatibility with Conway and Voltaire governance workflows. For teams already on v2.0.0, the project documentation indicates compatibility without requiring a resync. However, teams upgrading from v1.x.x require a full genesis resync of the yaci-indexer while allowing Cardano node data to remain intact.

Late last month, CNF covered Midnight Foundation’s support for the USDCx rollout on Cardano through the Critical Integrations Fund. The launch added Cardano-native dollar liquidity routes, with USDCx backed 1:1 by USDC in Circle’s xReserve smart contract.

Rosetta Java v2.1.0 Adds Conway Governance Operations

Rosetta Java v2.1.0 introduces two governance operations for Conway-era transaction structures: SPO voting and DRep vote delegation. Rosetta responses can now include these operation types when applicable, which supports explorers, indexers, and analytics tools that rely on Rosetta-formatted data.

Version 2.1.0 also adds support for CIP-129 by enabling automatic DRep type inference from prefixed identifiers. This reduces the need for manual configuration when delegating votes using CIP-129 formatted DRep IDs, while raw IDs still require explicit type handling.

Another change aligns HTTP status codes with error classification. Non-retriable client errors now return 400-level responses instead of 500-level responses. Client applications must update error handling if they previously used 500 responses for validation or request errors.

Operational tooling also received attention through an experimental admin user interface for Yaci indexers. The interface will enhance visibility and control for the operators who run the stack. In addition, the environment shifts include the migration of the Cardano node to version 10.5.4 and the replacement of Yaci components to ensure compatibility with the existing dependencies.

In the meantime, Cardano stablecoin-TVL ratio increased to 33.87%, with the supply of stablecoins reaching approximately $47.7 million and TVL nearing $140.83 million.

Previously, we covered that Charles Hoskinson said Cardano’s van Rossem hard fork is expected this month. The upgrade will bring Plutus improvements, cleaner ledger rules, and node performance updates.

After falling by approximately 3.8% in the last 24 hours, Cardano price traded at $0.2700 at press time. ADA short-term support is close to $0.2593, with resistance close to the 50-period EMA at $0.2775 and the 200-period EMA at $0.2928.