You put money into a pool. The pool earns yield on Blend. Every week, one saver takes the yield. Nobody loses their initial capital.
Arturo Grande, founder · Argentina Builder Challenge, BAF × Stellar · September 2026

What someone saving 50 USD at 4 % earns in a year. It changes nothing and motivates nobody.
What almost everyone who plays the lottery is left with. It motivates like nothing else, and the money never comes back.

USDC, or XLM and USDT0 swapped at the door. It goes straight into Blend.
Blend's interest accumulates as the prize, and grows live.
When the week is up, the draw fires on its own. drand provides the number and the contract verifies it.
The whole prize goes to one winner. Everyone else keeps what they put in.
Withdraw whenever you want: no penalty, no waiting for the draw, no permission.

Illustrative numbers
USDC, XLM or USDT0. The app quotes Soroswap and the Stellar DEX and swaps through whichever pays more.
Seven days of “I saved today” double your odds. Each referral adds 10 % of their capital to your weight.
Swap, deposit into Blend and withdrawal with real money from the app. Freighter, Cosmos, xBull and Lobstr.

5 to 10 % of the yield drawn each round. Never on the capital. Fixed in the contract, no admin.
A branded pool for a wallet, a fintech or a club: same contract, another token or cadence. The fee is shared.
| Motivates | Capital safe | Verifiable randomness | On Stellar | |
|---|---|---|---|---|
| Lottery | Yes | No | No | No |
| Blend directly | No | Yes | n/a | Yes |
| PoolTogether | Yes | Yes | Yes | No |
| Zorrito | Yes | Yes | Yes | Yes |

Blend v2, non-collateral Supply position: it earns interest and cannot be liquidated. USDC pays ~8 % a year.
drand signs a number that did not exist at close. The contract verifies it with Protocol 22's BLS12-381. Nobody can bias it.
When the timer runs out a keeper fires the draw for a fraction of a cent. If it fails, the app retries on its own.

arturogrande.com · @ArtuGrande
Product builder, entrepreneur and educator. Founder of Desafiatech, DevRel at Celo, SpaceXAI Ambassador, host of Builders OFF the Record (275 K+ views). Salta, Argentina.
Mainnet with USDC on Blend · join with XLM and USDT0 · streak and referrals · Freighter, Cosmos, xBull and Lobstr
Audit and a higher cap · fee on the prize in the contract · distribution through communities
Branded pools per community · USDT0 pool · mobile app and draw notifications
stellar.zorrito.app
We are looking for an audit to raise the cap, and distribution with wallets and communities across Latin America.
github.com/artugrande/zorrito · stellar.zorrito.app/docs · pool contract on stellar.expert