Vertical 04 — Blockchain
Build a multi-rail payment system. XRPL, stablecoins, and fiat in one product.
The Blockchain vertical covers DualPay — my cross-border payment system that settles in under 5 seconds across three rails (XRPL native, stablecoins, and fiat via Stripe). You learn XRPL transaction handling with xrpl.js, idempotency patterns using memo fields, reconciliation services that catch stuck transactions, volatility buffer management, and the KYB compliance layer you cannot skip.
Submit idempotent XRPL transactions that survive network retries
Route the same transfer through XRPL, stablecoin, or fiat rails based on sender/receiver
Build a reconciliation service that catches the 0.25% of stuck transactions
Manage volatility buffers without eating margin on small transfers
Integrate KYB (Persona) and OFAC screening before routing
Architect a multi-rail payment system that scales from $1 to $10M
Every module below is free to read and follow — the code, the templates, the receipts. Pro ($29/mo) is for the monthly live Q&A and the private community. Builder ($499/mo) adds direct email access and small-group coaching.
Ledger model, transaction types, fees, validation, why XRPL for payments.
Wallet management, transaction submission, memo-based idempotency, error paths.
Rail selection logic, quote engine, slippage buffers, bridge transactions.
Pending transfer tracking, ground truth queries, status updates, manual queue.
RLUSD integration, XRPL DEX, inventory management, rebalancing.
Persona KYB flow, OFAC screening, transaction limits, manual review workflow.
Live Build
Three-rail payment system settling on XRPL. Median settlement 4.2 seconds, median fee 3 cents, reconciliation service catches edge cases in the 0.25% of transfers that fall through.
4.2s median settlement time
3¢ median transaction fee
0.25% of transfers route to manual review
Mid-5-figure daily volume
The modules are free. Pro is for the monthly live Q&A and the community. Builder adds direct access and coaching.
Join Pro — Live Q&A + Community