> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stable.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Key features

> Stable's headline specs (single-slot finality, USDT0 as gas, full EVM compatibility) and the USDT-specific features built on top.

Stable is a delegated Proof-of-Stake Layer 1 with single-slot finality, full EVM compatibility, and USDT0 as the native gas token. The features below are the ones that shape day-to-day integration. Each links to the page that covers it in depth.

## Protocol-level features

| Feature                    | What it means                                                                                        |
| :------------------------- | :--------------------------------------------------------------------------------------------------- |
| **Single-slot finality**   | A transaction is final once it's in a block. No multi-block confirmation wait.                       |
| **Full EVM compatibility** | Solidity, Vyper, Foundry, Hardhat, ethers, viem, and `eth_*` RPC methods work unchanged.             |
| **USDT0 as gas**           | One asset serves as both native balance and ERC-20. No separate gas token to hold.                   |
| **Cross-chain bridging**   | USDT0 moves onto Stable from Ethereum, Arbitrum, HyperEVM, Tron, and other chains via LayerZero OFT. |

## USDT-specific features

<CardGroup cols={2}>
  <Card title="USDT as gas" icon="fuel" href="/en/explanation/usdt-as-gas-token">
    USDT0 serves as both the native gas token and an ERC-20 token on the same balance.
  </Card>

  <Card title="Gas waiver" icon="circle-off" href="/en/explanation/gas-waiver">
    Governance-authorized waivers submit wrapper transactions that execute at zero gas price on the user's behalf.
  </Card>

  <Card title="Guaranteed blockspace" icon="shield-check" href="/en/explanation/guaranteed-blockspace">
    Enterprise partners secure reserved capacity in every block for payment flows.
  </Card>

  <Card title="USDT transfer aggregator" icon="layers" href="/en/explanation/usdt-transfer-aggregator">
    High-volume USDT0 transfers batch into parallelized, fault-tolerant settlement bundles.
  </Card>

  <Card title="Confidential transfer" icon="eye-off" href="/en/explanation/confidential-transfer">
    Zero-knowledge cryptography shields transfer amounts while keeping parties auditable.
  </Card>
</CardGroup>

For which upgrades are live today and which are on the roadmap, see [Roadmap](/en/explanation/technical-roadmap).

## Next recommended

<CardGroup cols={2}>
  <Card title="Ethereum comparison" icon="git-compare" href="/en/explanation/ethereum-comparison">
    Identify what stays the same and what changes when you port from Ethereum to Stable.
  </Card>

  <Card title="Flow of funds" icon="arrow-right-left" href="/en/explanation/flow-of-funds">
    Trace USDT from on-ramp through on-chain transfer to off-ramp settlement.
  </Card>

  <Card title="Architecture overview" icon="layers" href="/en/explanation/core-optimization-overview">
    Walk through the consensus, execution, database, and RPC layers that deliver these features.
  </Card>
</CardGroup>