> ## 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.

# Tech overview

> How Stable's four-layer stack (consensus, execution, storage, and RPC) is tuned end-to-end for stablecoin payment throughput.

<Note>
  **What's live today:** StableBFT consensus, Stable EVM (full EVM compatibility), and the split-path RPC layer are all production-ready. StableDB ships in the v1.4.0 upgrade. Autobahn (DAG-based consensus) and StableVM++ (optimistic parallel execution) are roadmap items. See the [Roadmap](/en/explanation/technical-roadmap) for timelines.
</Note>

You can deploy Solidity or Vyper contracts on Stable today using Hardhat, Foundry, or any standard EVM tooling, and your contracts work without modification. What changes: gas is paid in USDT0, transactions reach single-slot finality, and every layer of the stack is tuned for stablecoin throughput.

<img className="block" src="https://mintcdn.com/stablelabs/J4B7HU7gv5jVOi-7/images/futurework.png?fit=max&auto=format&n=J4B7HU7gv5jVOi-7&q=85&s=04ca7d09a657f5780f53fa9bc4bcce76" alt="Tech Overview" width="1600" height="774" data-path="images/futurework.png" />

## StableBFT

**Status: Live**

Stable Blockchain leverages **StableBFT**, a customized PoS consensus protocol built on CometBFT, for high throughput, low latency, and strong reliability across the network.

<Note>
  **Planned:** DAG-based **Autobahn** consensus with decoupled data dissemination. See the [Roadmap](/en/explanation/technical-roadmap#phase-3-full-stack-optimized-layer-for-usdt).
</Note>

## Stable EVM

**Status: Live**

**Stable EVM** is Stable's Ethereum-compatible execution layer. Standard Ethereum tools and wallets interact with the chain unchanged. A set of **precompiles** bridges Stable EVM to the Stable SDK, letting EVM smart contracts call into core chain logic atomically.

<Note>
  **Planned:** **StableVM++** with optimistic parallel execution (Block-STM). See the [Roadmap](/en/explanation/technical-roadmap#phase-3-full-stack-optimized-layer-for-usdt).
</Note>

## StableDB

**Status: Ships in v1.4.0**

Stable fixes a major blockchain bottleneck: slow disk storage after each block. It separates state commitment from storage so blocks process without delay. `MemDB` and `VersionDB`, powered by `mmap`, keep recent data in memory while older data is stored efficiently, boosting overall throughput.

## High performance RPC

**Status: Live**

A slow RPC layer ruins the user experience even on a fast chain. Stable addresses this with a **split-path architecture** that separates operations by function, deploying lightweight, specialized RPC nodes for faster response times.

<Note>
  **Planned:** RPC nodes optimized for EVM view calls, plus a node-integrated indexer. See the [Roadmap](/en/explanation/technical-roadmap#phase-3-full-stack-optimized-layer-for-usdt).
</Note>