Zero Fee Crypto Giftcard Marketplace with flat 5% profit margin - 03/06/2026 05:56 EDT

EDIT: to clarify I'd like to use a third party api

I want a custom-built site that feels and flows like bitrefill.com or spendcryptos.com, yet is entirely my own codebase. The core idea is simple: visitors browse an inventory of digital gift cards, drop any value they like into a shopping cart, and pay a single on-chain invoice. The moment the network confirms the payment, the platform releases the card codes—no extra fees for the buyer, no hidden spread.

Cryptocurrencies to be accepted from day one are Bitcoin, Ethereum, Monero, Solana, XRP and Litecoin. I intend to self-host full nodes for every coin, so the back-end must talk directly to those nodes, not to third-party gateways. Please architect the payment module so I can plug in or remove coins later without touching the rest of the code.

Security is non-negotiable:
• End-to-end HTTPS, HSTS and secure headers
• Hot wallet keys never stored on the web server (watch-only nodes or hardware signer integration)
• Rate-limiting, captcha options and WAF rules to deter automated abuse
• Full audit trail for every transaction while keeping customer privacy intact

Essential workflow features:
• Real-time transaction monitoring with adjustable confirmation thresholds per coin
• Instant e-mail or on-screen delivery of gift card codes after payment clears
• Administrative panel to upload new SKUs, set reserves and track inventory
• Clean, mobile-first interface that mirrors the usability benchmarks of the two reference sites

Acceptance criteria for hand-off:
1. A docker-compose (or similar) stack that spins up the app plus testnet/full-node containers.
2. Code repository with clear README covering setup, environment variables and security hardening steps.
3. Successful end-to-end test: add a $5 card to cart, pay with testnet BTC, receive code automatically.
4. Brief security review outlining future hardening tasks.

If you have proven experience building crypto-native commerce sites and can deliver a rock-solid, zero-fee marketplace, let’s talk timelines and milestones.