07 · Network
Solana
The network, the byte limit that shapes the whole product, and who actually does the buying.
The network
| Gas token | SOL |
| What a swap costs | A fraction of a cent, which is the only reason rounding up 58 cents makes any sense at all |
| Block time | Around 400 ms |
| Explorer | https://solscan.io |
Any Solana wallet works. Phantom, Solflare and Backpack are the ones the app detects by name; anything that injects itself the standard way will connect too.
The 1232 byte rule
A Solana transaction cannot exceed 1232 bytes. That single number shapes this product more than any design decision we made: it is why a crumb buys one leg of your basket rather than four, and it is explained with the measurements in How it works.
The upside of the same design is atomicity. Several instructions in one transaction either all succeed or all fail, so your round-up can never half-happen, and a failed round-up cannot cost you a swap.
Where the buying happens
Every swap is routed by Jupiter, which quotes across the whole of Solana's liquidity and returns the instructions for the best route it finds. We assemble those instructions into the transaction you sign; we do not pick pools, hold a view on which venue is deepest, or route anything ourselves.
In practice a crumb this small lands in one hop on a single pool. The app shows the route and the price impact in the receipt before you sign.
Two standards, not one
Solana has an original token program and a newer one, Token-2022. Which one a token uses changes where its account lives, so it is not a detail you can gloss over.
| Token | Program |
|---|---|
| SOL, USDC, USDT | The original token program |
| Every stock token | Token-2022 |
Wallets deal with this by themselves. It matters if you are deriving account addresses by hand, and getting it wrong is silent: you compute a perfectly valid address that simply holds nothing, and conclude the balance is zero.
Tokenized stocks
The stocks the change buys are xStocks, issued by Backed. They are ordinary Solana tokens that trade around the clock in public pools, which is what makes a 58 cent purchase possible at all: no broker, no minimum, no market hours.
They are issued by a third party, not by Crumble. What the token is worth, and who stands behind the share it tracks, is not ours to guarantee. Risks says the rest of it plainly.
Impostors are the real hazard here. Several worthless tokens on Solana carry these exact symbols and names. Never pick a token by its symbol; check the mint address in Addresses.