FAQ

Getting started

What is Stable?

A Layer 1 where USDT0 is the native gas token and settlement asset. Standard EVM tooling works unchanged.

Who is Stable for?

Three builder profiles: payment and wallet teams moving USDT0, smart contract developers deploying to an EVM, and infrastructure teams running nodes or RPC. The Learn overview has a card per path.

Where should I start: Payments, Contracts, AI/Agents, or Infrastructure?

Moving USDT0 or building payment flows → Payments.
Deploying contracts → Contracts.
Wiring AI editors or building agent-paid services → Agent settlement.
Running nodes or covering gas for users → Infrastructure.

If you haven't connected to testnet yet, start with Quick start.

Technical

Is Stable EVM-compatible?

Yes. Solidity, Vyper, Foundry, Hardhat, ethers, viem, and the eth_* JSON-RPC methods all work unchanged. Four behaviors differ from Ethereum — see Differences from Ethereum.

Why is USDT0 the gas token?

So you pay fees in the asset you're already transacting in. No second token to fund, and fees stay denominated in a stablecoin. The protocol also optimizes USDT0-heavy workloads through guaranteed blockspace and transfer aggregation; see Core concepts.

How do I get USDT0?

Testnet: use the faucet at faucet.stable.xyz, or bridge Test USDT from Ethereum Sepolia. Walkthrough in Get testnet USDT0.
Mainnet: bridge USDT0 from another chain via LayerZero, or acquire through an exchange or custodian.

What changes when I port a contract from Ethereum?

Most contracts deploy unchanged. Three things to fix if they apply:

Don't mirror native balance in internal variables. transferFrom can drain native without calling the contract.
Don't transfer to address(0). Both native and ERC-20 transfers to zero revert.
Don't rely on EXTCODEHASH for address-reuse detection. Permit-based approvals change native balance without a nonce increment.

Full checklist: USDT0 behavior on Stable.

Resources

Where do I find tokenomics, roadmap, and architecture?

Tokenomics: STABLE supply, allocation, and vesting.
Technical roadmap: phased optimization plan.
Tech overview: StableBFT, Stable EVM, StableDB, and RPC design.
USDT-specific features: detail on gas, blockspace, aggregation, and confidential transfer.

Where do I go for help?

Developer assistance: FAQ and reference pointers.
Discord: community support and protocol updates.
bizdev@stable.xyz: partnership and integration conversations.

Next recommended

Quick start — Send a first transaction on testnet.
Core concepts — Learn the four core concepts you need before you build.
Learn overview — Pick the docs path that fits what you're building.
Production readiness — Validate an integration before shipping to mainnet.