Problem
Merchants wanted to accept Web3 payments without forcing customers into a specific wallet and without holding volatile assets. Off-the-shelf processors either didn't support Solana settlement paths cleanly or taxed the margin to death. A checkout SDK that handled the real-world edges — routing, staleness, failover — didn't exist.
What I built
- Wallet-agnostic checkout flow: customer pays in whichever SPL token they hold; merchant receives a chosen stablecoin.
- Jupiter integration for in-flight swap routing with slippage guards and quote-refresh windows.
- RPC provider abstraction with failover, cooldown, and jittered re-test — the service survives provider outages instead of dying with them.
- Real-time pricing with caching, staleness checks, and explicit reject paths when quotes move outside tolerance.
- Rate limiting, idempotency keys, and a settlement ledger that survives process restarts. Retries become reads, not re-runs.
Outcome
Production Web3 checkout SDK handling live merchant payments. Per-transaction cost an order of magnitude below traditional processors; settlement finality in seconds, not days.
Stack
TypeScript Node.js Solana web3.js Jupiter PostgreSQL Redis Docker
Building something similar?
If you're working on a project that rhymes with Aurion SDK, let's talk. A 30-minute call is free.