Is Stacks secured by Bitcoin?

Its history anchors into Bitcoin: post-Nakamoto, reorganizing settled Stacks blocks requires reorganizing Bitcoin. Liveness still depends on Stacks' own miners and signers — 'Bitcoin finality' describes settlement, not that Bitcoin miners run Stacks.

Are there stablecoins on Stacks?

Nothing mainstream natively in 2026 — the ecosystem's dollar legs are small or bridged, and its centerpiece asset is sBTC rather than a stablecoin. For dollar transfers, use a major stablecoin network and keep Stacks for its Bitcoin-programmability role.

What is STX used for?

STX pays Stacks transaction fees, fuels Clarity contract execution, and can be stacked — locked to support consensus in exchange for reward payouts in BTC. It's the working asset of the Bitcoin-anchored application layer.

Does STX have a maximum supply?

Stacks' 2020 monetary design caps supply at 1.818 billion STX, reached over decades of declining issuance to miners. Circulating supply was well past the majority mark by the mid-2020s.

Can I buy STX with a debit card?

Yes — Anytime Capital sells STX for debit cards from all major US banks, plus Apple Pay, Google Pay, credit cards, wires, and cash in person, delivered to your SP… address in minutes on verified orders.

Is sBTC the same as owning Bitcoin?

It's a 1:1 Bitcoin-backed claim maintained by a decentralized signer set and redeemable for on-chain BTC — the strongest non-custodial design among Bitcoin representations, but still a representation. For cold-storage holding, withdraw to a native Bitcoin address.

Crypto network guide

The Stacks Network, Explained

Q: How long does a Stacks transfer take?

About 5 seconds per block since the Nakamoto upgrade (October 2024), with everyday transfers landing in seconds to a couple of minutes. Bitcoin-anchored finality follows as blocks settle into Bitcoin's chain.

Q: What does a Stacks address look like?

Mainnet addresses start with SP — for example SP2J…. If an exchange deposit screen shows a memo beside the address, include it; pooled deposits rely on it.

Quick answer

Stacks is the leading Bitcoin Layer 2 for smart contracts, live since January 2021. Its Proof of Transfer consensus anchors every Stacks block to Bitcoin, its 2024 Nakamoto upgrade brought 5-second blocks with Bitcoin-grade finality, and sBTC (launched December 2024) puts BTC itself to work in its apps.

Buy STX now STX calculator

Updated August 2026 · Reviewed by the Anytime Capital trading desk

Stacks at a glance

Launched: 2021
Consensus: Proof of Transfer (anchored to Bitcoin; fast blocks since 2024)
Block time: ~5 seconds (since the Nakamoto upgrade)
Typical transfer time: Under 2 minutes
Typical network fee: Cents
Native asset: Stacks (STX)

Network fee: Typically a few cents per transaction in 2025–2026, paid in STX. Third-party network figures, not Anytime Capital pricing — our pricing is on the fees & limits page.

How long does a Stacks transfer take?

Since the October 2024 Nakamoto upgrade, Stacks produces blocks about every 5 seconds and reaches 100% Bitcoin finality once anchored — transactions can no longer be reorganized without reorganizing Bitcoin itself. Everyday transfers land in seconds to a couple of minutes.

Compare every chain on one page: how long crypto transfers take on every major network.

Smart contracts that settle to Bitcoin

Stacks' proposition: give Bitcoin the application layer it deliberately doesn't have, without changing Bitcoin. Its Proof of Transfer consensus has miners commit BTC to win Stacks blocks, and every Stacks block anchors into Bitcoin's chain — after the October 2024 Nakamoto upgrade, reorganizing settled Stacks history would require reorganizing Bitcoin itself. Contracts are written in Clarity, a decidable language built for asset safety.

sBTC: Bitcoin in the apps

sBTC — launched December 2024 — is a 1:1 Bitcoin-backed asset on Stacks, maintained by a decentralized signer set rather than a single custodian, redeemable for BTC on the base chain. It's the piece that makes 'Bitcoin DeFi' concrete: lending, trading, and yield built on the world's largest crypto asset while settlement anchors to Bitcoin. As with every representation: sBTC is a claim on BTC, and withdrawing to a bc1 address is how you hold the base asset itself.

Stacking: rewards paid in real BTC

Stacks' consensus recycles the BTC miners commit: STX holders who lock ('stack') their tokens receive those Bitcoin payments as rewards — one of the only mechanisms anywhere that pays yield in actual BTC rather than in the protocol's own token. Lockups run in ~2-week cycles. (US tax treatment of rewards applies; this is mechanics, not advice.)

Stablecoins on Stacks

No mainstream stablecoins run on Stacks. To move dollar-pegged value, use USDT or USDC on a supporting network — see stablecoins & their networks.

Stacks deposits need a memo

Some exchanges pool STX deposits and require a memo to credit your account. If the deposit screen shows one, it's mandatory; personal wallet-to-wallet transfers need no memo.

What does a Stacks address look like?

Stacks address formats
Format	Looks like	Notes
Standard address	Starts with SP (mainnet)	Exchange deposits may pair it with a memo — include it when shown

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