# Upcoming Stable Mainnet Upgrade (v1.2.0)

By [Stable](https://blog.stable.xyz) · 2026-01-23

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We’re pleased to announce an upcoming **Stable Mainnet protocol upgrade: Stable v1.2.0** on **February 4, 8:00 AM UTC**.

This release is focused on strengthening the network’s production readiness through improvements to **token usability**, **developer ergonomics**, and **chain observability**. The intent is to reduce friction for integrators and improve the reliability of downstream infrastructure (indexers, explorers, analytics, wallets, and application backends) operating on Stable.

**Stable v1.2.0 Upgrade Highlights**
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### **USDT0 as the Native Gas Token**

With v1.2.0, USDT0 becomes the native gas asset on Stable, replacing gUSDT. This removes the need to wrap or unwrap gas assets and unifies fee payment and settlement in a single stablecoin-denominated flow, simplifying wallet UX and integrations.

### **Staking and Undelegation Observability Improvements**

v1.2.0 adds a protocol-level on-chain signal when an undelegation completes. This enables applications and indexers to track staking lifecycle completion deterministically through chain data, without relying on polling or inferred state.  
_Note: This is an observability improvement, not a Stable Hub UI change. Hub UI support will follow in a separate release._

### **Improved Solidity Compatibility for STABLE Token Interactions**

This release fixes a Solidity compatibility issue affecting balanceOf() calls on the STABLE token for certain older compiler versions, improving reliability for teams migrating existing contracts.

### **Gas Waiver Support (Zero-Gas Transaction Capability)**

v1.2.0 introduces API-managed gas waivers for controlled zero-gas flows, designed for onboarding and user-facing payment experiences, with safeguards such as per-transaction limits, block caps, and rate limiting.

### **Infrastructure and Reliability Updates**

This release also includes dependency upgrades and stability improvements to support continued production performance and operational resilience.

**Recommended Actions for Partners**
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To ensure a smooth transition, we recommend that partners:

*   Confirm support for **USDT0-based gas fee handling** across signing, fee estimation, and transaction submission flows.
    
*   Update indexers / analytics pipelines to listen for the new **undelegation completion event signal.**
    
*   Validate STABLE token integrations, particularly if supporting older Solidity builds.
    
*   Review any workflows that rely on prior gUSDT assumptions.
    
*   Check our [FAQ](https://docs.stable.xyz/en/architecture/usdt-specific-features/usdt-as-gas-token#faq) and reach out to the Stable team if you have any enquiries.
    

We will share additional release notes and technical references ahead of activation. Stay tuned!

**Build on Stable**
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*   Documentation: [](https://docs.stable.xyz/)[https://docs.stable.xyz](https://docs.stable.xyz)
    
*   Mainnet Hub: [](https://hub.stable.xyz/)[https://hub.stable.xyz](https://hub.stable.xyz)
    
*   Blog: [](https://blog.stable.xyz/)[https://blog.stable.xyz](https://blog.stable.xyz)
    
*   X: @stable
    
*   Community: [https://discord.gg/stablexyz](https://discord.gg/stablexyz)

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*Originally published on [Stable](https://blog.stable.xyz/upcoming-stable-mainnet-upgrade-v120)*