Case study · Web3 · Fintech
Vailox
A P2P marketplace to buy and sell USDT and USDC for euros, dollars and other currencies, with funds held in an on-chain escrow that nobody controls.
- Industry
- Web3 · Fintech
- Project
- P2P marketplace · Smart contracts
- Website
- vailox.com
- blockchain networks
- 6
- payment methods
- 20+
- held by the platform
- 0 $
The challenge
Buying crypto without KYC or middlemen usually means trusting strangers. Vailox needed to guarantee that nobody, not even the platform itself, could keep the funds of a trade.
What we built
At its core is an escrow contract that locks funds on-chain until both sides deliver. We audited it ourselves before launch.
Around it we built the full marketplace: listings, orders, real-time chat, reputation and dispute resolution, with wallet sign-in across six networks, Tron included.
We added everyday tools (bridge, swap, refuel and a cash-point map) and a bilingual marketing site with a blog.
Key features
- Audited on-chain escrow
- Real-time chat, reputation and disputes
- Wallet sign-in (SIWE) with no mandatory KYC
- 6 networks, including Ethereum, Base and Tron
- Bridge, swap, refuel and a cash-point map
- Spanish and English website with a blog
Technology
- Next.js
- React 19
- Convex
- Better Auth
- wagmi
- viem
- TronWeb
- Solidity
- StyleX
- Astro
We needed people who understood both product and smart contracts. They audited our escrow and helped us launch with complete peace of mind.