ArPay Protocol Documentation

# Overview

ArPay is a peer-to-fiat settlement protocol that bridges the gap between cryptocurrency holders and traditional merchants. It enables seamless conversion of on-chain USDC to local fiat currency (IDR) without requiring merchants to interact with any cryptocurrency infrastructure.

# The Problem

Commerce between digital asset holders and traditional merchants faces a fundamental mismatch:

• Merchants operate exclusively within banking systems that recognize legal tender
• Crypto holders possess value in programmable, censorship-resistant tokens
• No direct settlement exists that satisfies both parties without forcing one to adopt the other's infrastructure

Current Solutions Fall Short

# The ArPay Solution

ArPay resolves this asymmetry through protocol-level separation of concerns:

# Key Features

⚡ Lightning Fast Settlement

Complete settlement cycle from transaction signature to merchant bank credit in 3-6 seconds under nominal network conditions.

🔒 Non-Custodial & Trustless

• Users maintain self-custody via standard Solana wallets
• Merchants never touch crypto—receive only legal tender
• No intermediary can freeze or confiscate funds

🛡️ Atomic Settlement Guarantee

Formal guarantee: Either the merchant receives fiat OR the user receives a full USDC refund. No intermediate state where funds are lost.

🏦 QRIS Native Integration

Leverages Indonesia's standardized QR payment system (QRIS) with 30M+ merchant terminals nationwide.

📊 Transparent & Auditable

All on-chain operations are publicly verifiable on Solana blockchain. Open-source smart contract code.

# How It Works (Simplified)

sequenceDiagram
    participant User
    participant Wallet
    participant Solana
    participant Oracle
    participant Gateway
    participant Merchant

    User->>Wallet: Scan QRIS code
    Wallet->>User: Show USDC amount
    User->>Solana: Sign & submit transaction
    Solana->>Solana: Lock USDC in PDA escrow
    Solana->>Oracle: Emit SettlementRequested event
    Oracle->>Gateway: POST /disbursements (IDR)
    Gateway->>Merchant: Transfer IDR via BI-FAST
    Merchant->>Merchant: Receive fiat in bank
    Oracle->>Solana: Release USDC from escrow

# Technical Highlights

# Performance Metrics

Under nominal conditions on Solana Mainnet-Beta with premium RPC:

# Target Market

Primary: Indonesia — 30M+ QRIS merchants, 270M+ population, high mobile penetration

Generalizable: Any market with:

• Standardized QR payment scheme
• Licensed Payment Gateway API
• Instant fiat settlement network

# Use Cases

1. Cross-border remittances — Send USDC globally, receiver gets local fiat instantly
2. Crypto spending — Use crypto holdings for everyday purchases without merchant onboarding
3. Tourism — Visitors pay with crypto, merchants receive local currency
4. Freelancer payments — Receive crypto wages, spend as fiat instantly
5. Merchant adoption — Zero-risk crypto acceptance for traditional businesses

# Getting Started

# Project Status

# Open Source

ArPay is open-source and contributions are welcome:

• Smart Contract: github.com/arpay/smart-contract
• Frontend: github.com/arpay/frontend
• Oracle Bridge: github.com/arpay/oracle-bridge

# Support & Contact

• Website: www.arpay.net
• Email: arshaka@gmail.com
• Documentation: You're reading it! 📖
• Discord: Join our community
• Twitter: @ArPayProtocol