Fintech Apps Built for Users Who Don't Trust Apps With Their Money Yet
Trust is the only product in fintech. A payment app with a good UI but an unclear security model, vague transaction states, or a single high-profile breach is a deleted app. We build the architecture that earns the trust.
The Problem
The trust problem that no amount of good UI design fixes
Fintech apps fail not because of poor design — they fail because users encounter a moment where they don't understand what happened to their money, and they never open the app again.
Where it breaks down:
- Mainstream Web3 onboarding: wallet creation and transaction flows for users who have never held cryptocurrency
- Smart contract security: audit-ready architecture from the first line
- Transaction UX: every gas fee and failure mode as a product problem
Relevant Service Tracks
Featured Work
Projects in Fintech & Payments
Tesseract
zk-SNARKs credential vault, AES-256, Lit Protocol, IPFS
Pact
Polygon escrow, milestone smart contracts, Chainlink oracle, non-custodial onboarding for crypto-naive users
SwiftCart
Blockchain payments invisible to mainstream shoppers, checkout in three taps
Splitville
Shared expense tracking with instant settlement
"We needed a crypto wallet that felt as trustworthy as MetaMask but simpler to use. The App Stop team built a non-custodial wallet with a beautiful onboarding flow and built-in gas optimisation that actually saves users money."
— James Wilson, Founder @ CryptoWallet
Why App Stop
We write smart contracts that pass audit on the first submission
Smart contracts that pass audit first submission
Web3 onboarding for users who've never held crypto
Every transaction state as a product design problem
Expected
Outcomes
Smart contracts pass external audit on first submission
Onboarding flow mainstream users complete
Transaction states that never leave users wondering
Regulatory-aware architecture for compliance conversations
Questions
Industry FAQ
Do you handle smart contract audits?
We write audit-ready code and partner with top-tier security firms for the final independent audit before mainnet deployment.
How do you approach regulatory compliance?
We design architectures that support KYC/AML workflows and can adapt to changing local financial regulations.
Can you build traditional + crypto payments in one app?
Yes, we build hybrid systems that bridge fiat gateways (like Stripe or Plaid) with on-chain settlement.
What if there's a bug in a deployed contract?
We implement upgradeable proxy patterns and multi-sig administrative controls to allow for safe patching.
Let's build an app
Your Users Will Love
- Expect a response from us within 24 hours
- We're happy to sign an NDA upon request.
- Get access to a team of dedicated product specialists.