Appendices
A. Conversion & FX Engine (Section 2.4)
Pricing Methodology: Inspired by Stellar SEP-38, with real-time quotes, locked rates, and fiat/stablecoin conversion paths.
Data & Liquidity Sources: Oracles (Chainlink, Pyth), on-chain AMMs (Curve, Uniswap), centralized market makers, and custodial partners.
Execution Flow: Quote request → rate lock → conversion execution → settlement.
Spread & Fees: Transparent spreads, slippage management, and dynamic routing for best execution.
B. Security & Custody Layer (Section 2.5)
Smart Contract Security: Audits, continuous monitoring, and upgrade safeguards.
Custody of Reserves: Segregated accounts with regulated custodians, proof-of-reserves attestations.
Treasury Management: Multi-sig/MPC wallets, withdrawal controls, insurance coverage.
Fraud Safeguards: Double-spend prevention, AML/KYC screening, rug-risk mitigation.
C. User & Platform Flows (Section 3)
Buy (3.1)
On-Ramps: Bank transfers, cards, mobile money.
Conversion: Into USDC, USDT, PYUSD via FX Engine.
Compliance: KYC/AML enforced at funding.
Technical: APIs to payment processors, resilient on-ramp gateway.
Send (3.2)
Remittances: Instant P2P transfers.
Multi-Chain Routing: Ethereum L2s, Solana, Stellar, Polygon.
Settlement Guarantees: Locked rates, deterministic ledger entries.
Enterprise Use Case: Bulk payouts via API.
Spend (3.3)
Merchant Payments: Checkout APIs, hosted pages, QR-code flows.
Bills & Utilities: Partner-driven integrations for recurring payments.
Treasury Tools: Invoicing, bulk settlement, ERP integration.
Webhooks: Real-time confirmations for merchants.
Earn (3.4, Future)
Yield Accounts: Partner-driven or DeFi integrations.
Staking Models: Where legally compliant.
Liquidity Tiers: Flexible APYs with instant or locked access.
Risk Transparency: Full disclosures and monitoring.
Rewards (3.5, Future)
Loyalty Incentives: Fee discounts, cashback in stablecoins.
Tiered Usage: Silver, Gold, Platinum reward levels.
Optional Token: Potential governance token integration.
Compliance: Structured as rebates, not securities.
Sell (3.6)
Stablecoin Source: Debiting and validation.
Conversion: Via custodians or DEXs into fiat.
Payouts: Bank transfers, mobile wallets, cash pickup.
Settlement: Typically T+0 to T+2 with cryptographic proof.
D. On/Off-Ramps & Platform Services (Section 3.X)
On-Ramp: Fiat entry via cards, banks, mobile money; mandatory KYC/AML.
Off-Ramp: Fiat exits via banks, wallets, or cash pickup.
Cross-Border Transfers: SEP-31 anchor model with licensed partners.
Merchant Tools: Checkout, invoices, QR payments, APIs.
B2B API Suite: Bulk payouts, treasury conversion, accounting hooks, white-label workflows.
E. Compliance & Trust (Section 6)
KYC/AML: SEP-12 standard, individual KYC, KYB for businesses, ongoing monitoring.
Regional Frameworks: MiCA (Europe), CBN (Nigeria), FinCEN (US), jurisdiction-specific adaptation.
Transparency: Proof-of-reserves, public attestations, on-chain liquidity proofs.
Auditability: Records structured for external audits and regulatory reporting.
F. Technical Components (Section 7)
Settlement Engine: Multi-chain routing with cryptographic finality.
Smart Contracts: Custody, escrow, bridging, upgradability with safeguards.
FX Oracles: Decentralized feeds (Chainlink, Pyth), fallback providers, tamper resistance.
APIs & SDKs: REST/GraphQL, webhooks, SDKs in major languages, sandbox testing.
Integration Patterns: Wallet apps, exchanges, merchants, fintech white-label use cases.
G. Risk & Security (Section 8)
Smart Contract Risks: Mitigated by audits, monitoring, controlled upgrades.
Custody Risks: Managed with regulated custodians, MPC/multi-sig, insurance.
FX Risks: Controlled through rate locks, liquidity aggregation, slippage controls.
Stress Testing: Continuous simulations for resilience under volatility.
H. Roadmap (Section 9)
Phase 1: On/Off-ramp integration with providers like Transak, MoonPay.
Phase 2: Merchant APIs, bulk payouts, enterprise onboarding.
Phase 3: Multi-chain liquidity routing and DeFi-based treasury management.
Phase 4: Expansion into 100+ markets with anchors, compliance, and localized services.
I. Conclusion (Section 14)
Mission Restated: Fast, low-cost, compliant global payments.
Call to Action: Developers to build, businesses to integrate, regulators to collaborate.
Closing Note: Epay as a backbone of borderless, trusted, and universally accessible financial infrastructure.
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