Testnet is live — try it now

Build the future of Bitcoin.

Stax is an EVM-compatible ZK-Rollup on Bitcoin. Deploy smart contracts, build DeFi — secured by Bitcoin's $2T settlement layer.

⚡ Launch App Start Building →
—
Blocks
—
Transactions
~1000
Max TPS
Groth16
ZK Proof Type
The Problem

Bitcoin is worth $2 trillion.
And it does almost nothing.

The world's most secure and trusted monetary network has no smart contracts, no DeFi, no programmability. That $2T sits idle.

❌
No smart contracts Bitcoin Script is intentionally limited — you can't build DeFi natively on L1
❌
Existing bridges are dangerous Most Bitcoin bridges use multisig — you trust a group of people, not math
✅
Stax solves this EVM execution + ZK proofs + trustless BitVM bridge — all settled on Bitcoin
$2T
locked in Bitcoin with zero yield,
zero programmability, zero DeFi
How It Works

Bitcoin security.
Ethereum flexibility.

Stax combines the best of both worlds without compromise.

Step 01
₿

Deposit BTC

Send BTC to a P2TR address generated by the BitVM bridge. Your funds are locked on Bitcoin L1 — no custodian. (Testnet: Bitcoin Signet)

Step 02
⚙️

EVM Execution

Transactions execute on the Stax L2 using REVM — the same EVM that powers Ethereum. Deploy Solidity contracts instantly.

Step 03
🔐

ZK Proof Generated

Every batch of transactions gets a Groth16 ZK proof via SP1. The state transition is cryptographically verified — not just trusted.

Step 04
⚓

Anchored to Bitcoin

State roots and batch data are posted to Bitcoin L1 via OP_RETURN. Bitcoin is the final settlement layer — inheriting all its security.

Why Stax

What makes us different

Not another Ethereum L2. A completely new approach to Bitcoin programmability.

🔗

BitVM Bridge (Experimental)

Our bridge is built on BitVM2+3 — Lamport signatures + Taproot fraud proofs. No multisig, no federation. Currently on Bitcoin Signet testnet; mainnet requires further security review.

🔷

Full EVM Compatibility

Use MetaMask, Foundry, Hardhat, viem, ethers.js — everything you already know. Deploy any Solidity contract without changes.

✅

ZK Validity Proofs

Groth16 proofs via SP1 (Succinct Labs). No 7-day challenge periods. State validity is proven cryptographically, not assumed optimistically.

⛓️

Bitcoin as Settlement

State roots anchored to Bitcoin via OP_RETURN every batch. The world's most secure and decentralized blockchain is your final arbiter.

📦

Data Availability on Bitcoin

Transaction batch roots posted on-chain. No separate DA layer to trust. Bitcoin stores your commitments permanently.

🛠️

Developer First

TypeScript SDK, RPC endpoint, faucet, block explorer, contract ABI registry — everything you need to ship on day one.

DeFi Stack

A full DeFi ecosystem.
Already deployed.

We didn't just build infrastructure. We built the first apps on it — so you can fork, extend, or build on top.

🔄

AMM (SimpleSwap)

Uniswap v2-style x·y=k AMM for BTC/stBTC pairs with LP tracking

Live on testnet
🏦

Lending Protocol

Deposit stBTC as collateral, borrow up to 75% LTV. Liquidations built in.

Live on testnet
🏛️

Yield Vault (ERC-4626)

Standard vault interface. Deposit BTC, earn yield. Compatible with any aggregator.

Live on testnet
⚡

Flash Loans

Atomic flash loans with 0.09% fee. Borrow stBTC within a single transaction.

Live on testnet
🥩

Staking

Stake BTC to earn rewards. Time-based reward distribution.

Live on testnet
🪙

stBTC (ERC-20)

Wrapped BTC minted 1:1 when you deposit. 8 decimals, compatible with all EVM tooling.

Live on testnet
For Bitcoin Holders

Your Bitcoin should
work for you.

Deposit BTC, receive stBTC, earn real yield from DeFi activity. ZK-proven. No custodian. No trust.

₿

Deposit BTC

Send BTC to the BitVM bridge. Cryptographically locked on Bitcoin L1 — no custodian, no multisig. (Currently on Signet testnet)

→
🪙

Receive stBTC

Get stBTC — a liquid staking token that accrues value over time. Use it across DeFi or just hold to earn.

→
📈

Earn Real Yield

stBTC earns from AMM trading fees, lending interest, and protocol revenue. Real yield from real on-chain activity.

Testnet Points Program

Earn STAX Points.
Convert at TGE.

Join testnet now, rack up points. When STAX token launches, your points convert to real tokens. Early users get the highest multipliers.

🌉
Bridge tBTC to Stax Earn points per 0.01 BTC bridged
100 pts / 0.01 BTC
🥩
Hold stBTC daily Passive points just for holding
10 pts / day
🔄
Use DeFi protocols AMM swaps, lending, vault deposits
5–50 pts / tx
👥
Refer a friend Earn 20% of their points forever
20% referral
✅ You're on the list! Check your inbox — early access is first-come, first-served.
Testnet is live now. Connect MetaMask at /app to start earning points today.
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Point Multipliers
🥇 First 100 users 5× multiplier
🥈 Users 101–500 3× multiplier
🥉 Users 501–2000 2× multiplier
🌐 Everyone else 1× multiplier
For Developers

Everything you need.
Nothing you don't.

We built the hard parts so you can focus on your product.

✓
TypeScript SDK npm install @stax/sdk — typed wrappers for all contracts, CLI included
✓
Standard JSON-RPC eth_call, eth_getLogs, eth_getTransactionReceipt — MetaMask compatible out of the box
✓
Testnet Faucet Get 1 BTC on testnet instantly. No Twitter, no captcha.
✓
Verified Contract ABIs All deployed contracts available at /contracts — addresses, ABIs, source code links
✓
Developer Grants Building on Stax? Apply for a grant from the ecosystem fund — 30% of STAX supply allocated to ecosystem growth
Developer Portal → Apply for Grant
getting-started.ts
// Install: npm install @stax/sdk import { BtcL2Client } from '@stax/sdk'; const client = new BtcL2Client({ rpcUrl: 'https://stax.network/rpc', }); // Check your balance const balance = await client.getBalance(address); // Swap BTC → stBTC on AMM await client.swap.btcForWbtc({ amountIn: parseEther('0.1'), slippage: 0.5, }); // Deploy your own contract // Chain ID: 0x4254434C32 ("BTCL2") // RPC: https://stax.network/rpc
STAX Token

The fuel of the
Stax ecosystem.

STAX is the native token powering governance, sequencer staking, and the developer grant program.

⛽
Gas Token Pay transaction fees on the Stax L2 network
🗳️
Governance Vote on protocol parameters, fee rates, and grant allocations
🔒
Sequencer Staking Stake STAX to run a sequencer node and earn fees
💰
Fee Sharing Protocol fee revenue distributed to STAX stakers
Token Distribution — 1,000,000,000 STAX
Ecosystem & Grants30%
Team (4yr vesting)20%
Early Supporters15%
Treasury20%
Liquidity10%
Community Airdrop5%
✦ Early Access Waitlist

Get early access to STAX

Join the waitlist to be first in line for TGE. Early supporters receive priority allocation and multiplied STAX points.

✅ You're on the list! We'll reach out before TGE.
Roadmap

Where we are.
Where we're going.

✓ Q1 2026 — Done

Testnet Launch

✓ ZK-Rollup on Bitcoin Signet
✓ BitVM2+3 trustless bridge
✓ SP1 Groth16 ZK proofs
✓ Full DeFi stack deployed
✓ EVM RPC + MetaMask
✓ Developer SDK
→ Q2 2026 — Now

Community & Token

→ STAX token launch
→ TGE & token launch
→ Developer grant program
→ Public GitHub & docs
→ Security audit
Q3 2026

Mainnet Prep

○ Decentralized sequencer
○ On-chain proof verifier
○ Bitcoin mainnet bridge
○ 3rd-party dApps on Stax
Q4 2026

Mainnet & Scale

○ Mainnet launch
○ Real BTC settlement
○ Perpetuals & options
○ Cross-chain bridges

Ready to build on Bitcoin?

The testnet is live. Connect MetaMask, get test BTC from the faucet, and deploy in minutes.

⚡ Launch Testnet App 📖 Read the Docs