How Stackk works

Your money sits in a vault you own, and the vault buys Bitcoin on a schedule

Add money

Pay from Ethereum, Base, Arbitrum, Solana, BNB Chain, Polygon, Optimism, Avalanche, Sui, Stellar, NEAR, Stacks, Injective or Sonic
Pay with USDC, USDT, ETH, SOL, BNB or most other tokens on those chains
It’s one swap through SODAX, and the money lands straight in your vault
Anything that isn’t a dollar coin is sold for USDC once, when it arrives

It’s a small contract on the Sonic network that belongs to you alone
Its address comes from your wallet and your delivery addresses, so nobody else can create it for you
You make it with your first signed action, and with an EVM wallet you don’t need any Sonic gas for that
Only your wallet can withdraw from it, and withdrawals go back to your own wallet

Pick an amount, from $5 a buy
Pick how often: every day, week, two weeks or 30 days
Pick a budget, and the plan stops when it’s used up
Pick a price limit: the lowest Bitcoin price a buy may accept, 1.5% below the market by default and never more than 5%
Run up to four plans at once, and pause or stop any of them whenever you like

The alarm rings
A keeper, ours or anyone’s, tells your vault a buy is due. It can’t change anything else.
The vault checks the rules
Is it on schedule, inside the budget, under the caps, and funded? If not, nothing happens.
It sets a price floor
The lowest Bitcoin it will accept comes from Chainlink’s price feed, never from the keeper.
It places the order
The vault sends the order to SODAX itself, and independent solvers compete to fill it.
Filled
The Bitcoin arrives, and we collect our 0.25% fee only now.
Not filled in 10 minutes
The order is cancelled and every dollar returns to your vault, fee included. That buy is skipped, and it’s never doubled up later.

Bitcoin tokens, cbBTC on Base or WBTC on Arbitrum, are sent to your address after every buy
Real Bitcoin is collected in your vault and sent in one batch, at least once a month
You can send a batch whenever you like, and a batch also goes out by itself once it’s big enough
Real Bitcoin lands in a wallet you co-hold with Bound, and you can move it from there

The Bitcoin network charges a mostly fixed fee. On a $10 buy that fee is about 5.2%. On $300 it is a fraction of 1%.

So we keep your real Bitcoin in the vault and send it together. Tokens have no such fee, so they go out on every buy.

Costs of a Stackk plan
Part	Cost
Stackk fee	0.25% of each buy that fills
Swap into Bitcoin	about 0.2% on a $10 buy, less on bigger ones
Tip to whoever triggers the buy	1¢ by default, and you can change it
Sending real Bitcoin	about 0.1–0.5% per batch
Sonic gas	paid by the keeper
Unfilled buys, withdrawals	free

A $10-a-day plan comes to about 0.65–1.05% all in. The numbers are SODAX quotes from October 2026, and the app shows a live quote before you confirm.

Withdraw any time, and the vault keeps working for your other plans
Money goes only to the wallet you signed up with, on Sonic or back to your own chain
A withdrawal to another chain is a swap, and if nobody fills it the money returns to the vault
The vault has no way to send your money anywhere else

Who does what in Stackk
Who	What they do
You	Own the vault, set the plan, withdraw any time
Your vault	Holds the money and buys on schedule, within your rules
Stackk	Runs the website and the keeper that starts buys, and collects the fee
SODAX	Swaps and cross-chain delivery
Chainlink	The price used for every buy’s floor
Bound	Co-signs the wallet that receives real Bitcoin
Coinbase and BitGo	Issue cbBTC and WBTC

Anyone can run the keeper, so buys don’t depend on us. If Stackk shut down, you could still withdraw straight from the contract with an EVM wallet.

Launching soon