@hisaluto JUST PASSED 2,250 USERS IN A SINGLE DAY.
And it’s officially the app I’ve built that has reached the most users in my life.
My last 2 months as DevRel at
@Celo and
@CeloDevs have had a strong focus on building mini apps and developer tooling in-house.
@hisaluto has, without a doubt, been the most challenging product I’ve ever built.
An English-learning app inside
@MiniPay, designed to be sustainable from day one.
A bit of the stack:
• Self-hosted voice AI, so the economics work at micropayment scale
• On-chain payment verification without a smart contract: stablecoin transfers to the treasury, validated server-side using recipient + amount + sender + double-spend protection
• 4 stablecoins (USDC / USDT / USAT / USDm), with decimals handled on-chain and gasless transactions inside minipay
• An incentive engine that never pays twice: reserve → broadcast → confirm, with nonce + locks and a needs_review state for ambiguous transactions
• Wallet as identity: no signup, no KYC
Micropayments → MRR.
The whole system is designed to scale, using Fastify + Postgres + Redis, with E2E tests running against a Celo fork in CI.
And soon, it will be available to 18M+ MiniPay users.
Huge team effort with:
@benibauer3 @SZapelao @GigaHierz @viral_sangani
2,250 users in one day is just the beginning.
More
#BuildInPublic content from this mini app coming soon. 🛠️