# Stable v1.2.0 Upgrade: USDT0 Gas and Core UX Improvements

> Stable is upgrading the mainnet with USDT0 gas. Stable v1.2.0 introduces protocol upgrades for simpler gas payments and enterprise-grade integration.

**Published by:** [Stable](https://blog.stable.xyz/)
**Published on:** 2026-02-04
**URL:** https://blog.stable.xyz/stable-v120-upgrade-usdt0-gas-and-core-ux-improvements

## Content

At Stable, we are on a mission to design a seamless infrastructure for the real economy. StableChain provides a fast, predictable, compliant, and low-cost settlement platform that enables scalable stablecoin payments for institutions while remaining straightforward for users. Since Stable Mainnet launched on December 8, 2025, the network has established a foundation for stablecoin-native settlement. Today, we are excited to announce Stable v1.2.0, a significant upgrade that improves the overall experience for both retail users and developers in the Stable ecosystem. This upgrade introduces several key protocol-level enhancements designed to simplify token usage, improve developer ergonomics, and enhance chain observability and stability. Key Features of the v1.2.0 UpgradeUSDT0 as the Native Gas TokenWith v1.2.0, USDT0 is now the native gas token on Stable, replacing gUSDT. As part of this transition, gUSDT will sunset, and all existing gUSDT balances will be automatically converted to USDT0. This update simplifies how users and applications interact with the network by removing the need for wrapping and unwrapping. Now, USDT0 serves as both the native gas token and an ERC-20 token. It can now be used both for:Network fees (gas)Standard token actionsincluding approve, permit, transfer, and transferFromIn practice, this means users can pay fees and move value using the same stablecoin representation, without having to wrap or unwrap tokens, thereby simplifying the experience for users and developers alike. For technical details and implementation notes, please refer to the documentation.Enhanced Staking Transparencyv1.2.0 improves visibility into staking lifecycle events. Previously, completion of the STABLE token unstaking did not emit any on-chain events, and smart contracts had to actively monitor blockchain events through RPC calls until the end of the 7-day unbonding process. With this upgrade, Stable will include system-generated transactions (sent by 0x1) when an UnbondingComplete event occurs. Applications and indexers can now reliably track completed undelegations through on-chain events by listening to events and querying finalized balances.Improved Solidity Compatibilityv1.2.0 resolves a compatibility issue affecting older Solidity versions.Contracts compiled with Solidity versions earlier than 0.8.10 could not reliably call the balanceOf method on the STABLE token. This issue has now been fixed, improving compatibility across a broader range of tooling and deployments.Gas Waiver SupportStable v1.2.0 introduces support for gas-waived transactions, enabling selected flows to execute without requiring users to hold gas upfront. The gas waiver system is API-managed and includes safeguards designed to prevent abuse, including:per-transaction usage limitsblock-level capsAPI rate limitingGas waivers are executed through a set of approved waiver accounts, which can be updated through governance. Waived transactions are wrapped and signed by a waiver account to ensure consistent enforcement and accountability. For integrators and developers, this unlocks new onboarding and payment UX patterns while maintaining protocol-level controls.What This Upgrade EnablesStable v1.2.0 strengthens the foundation for stablecoin settlement at scale by:reducing token friction for users and applicationsimproving event-driven visibility for staking workflowsexpanding compatibility across Solidity toolingenabling new gas abstraction patterns for smoother UXreinforcing reliability for production workloadsWhat’s NextStable v1.2.0 is part of an ongoing roadmap to make StableChain easier to integrate, easier to operate, and more resilient at scale. Over the coming releases, Stable will continue to improve:settlement reliability under sustained loaddeveloper tooling and ecosystem infrastructurepayment-oriented UX for real-world stablecoin flowsMore updates will be shared through official Stable channels.Build on StableDocumentation: https://docs.stable.xyzMainnet Hub: https://hub.stable.xyzBlog: https://blog.stable.xyzX: https://x.com/stableCommunity: https://discord.gg/stablexyz

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