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⚡ ArcNexus — A Full Stack DeFi Gateway Built on Arc Testnet

, a full stack DeFi application I built entirely on Arc Testnet. This isn't just a demo  it's a working application with real smart contracts deployed on chain, cross chain bridging, token swaps, and a unique escrow payment system.

ArcNexus is a multi-feature DeFi gateway that currently supports:

Address: 0xbDC1e9bf597458A02De818c10dA70061BbE5d514Explorer: https://testnet.arcscan.app/address/0xbDC1e9bf597458A02De818c10dA70061BbE5d514

This is the core of the RefundPay feature. It handles payment locking, release, refund, and dispute states.

PENDING   → Payment locked, waiting for approvalCOMPLETED → Sender approved, funds sent to recipient

REFUNDED  → Arbiter refunded funds back to sender

DISPUTED  → Under dispute, waiting for arbiter decision

createPayment(recipient, arbiter, token, amount, description)approvePayment(id)   // Sender or arbiter releases fundsrefundPayment(id)    // Arbiter refunds to senderdisputePayment(id)   // Sender or recipient raises disputegetPayment(id)       // Read payment details

Address: 0x6e40f9AEB9cA2B24c2049F1553Fb3D272c114408Explorer: https://testnet.arcscan.app/address/0x6e40f9AEB9cA2B24c2049F1553Fb3D272c114408

Handles USDC ↔ EURC swaps with on-chain AMM pricing.

swap(tokenIn, tokenOut, amountIn)getAmountOut(tokenIn, amountIn)getPoolBalances()

USDC: 0x3600000000000000000000000000000000000000EURC: 0x89B50855Aa3bE2F677cD6303Cec089B5F319D72a

Circle's Cross-Chain Transfer Protocol V2 (CCTP V2)

 to move USDC between Arc Testnet and Ethereum Sepolia.

User approves USDC to the CCTP contract on Arc

 is called — USDC is burned on source chain

Circle attestation service signs the burn proof

 is called on destination chain — USDC is minted

Arc Testnet  →  Ethereum SepoliaEthereum Sepolia  →  Arc Testnet

TokenMessenger (Arc):     Circle CCTP V2 deployment on ArcMessageTransmitter (Arc): Handles cross-chain message relay

This is my favorite feature. RefundPay brings 

 to crypto — something traditional crypto payments completely lack.

[Sender] → createPayment() → [Smart Contract locks funds]                                      ↓

                            [Recipient delivers]

                                      ↓

              ┌─────────────────────────────────────┐

              │                                     │

         [Approve]                             [Dispute]

    funds → recipient                        arbiter decides

                                            /              \

                                     [Approve]          [Refund]

                                   funds→recipient   funds→sender

 — trusted third party, resolves disputes

If no arbiter is specified, the sender becomes the arbiter by default.

The swap feature uses a custom AMM (Automated Market Maker) contract deployed on Arc Testnet.

User approves token allowance to swap contract

Frontend:        React.jsWeb3 Library:    ethers.js v6

Network:         Arc Testnet (Chain ID: 5042002)

RPC:             https://rpc.testnet.arc.network

Explorer:        https://testnet.arcscan.app

To use ArcNexus, add Arc Testnet to MetaMask:

Network Name:    Arc TestnetRPC URL:         https://rpc.testnet.arc.network

Block Explorer:  https://testnet.arcscan.app

git clone https://github.com/selinisdil/arcnexus.gitcd arcnexusnpm installnpm start

Building on Arc has been a genuinely great experience. The EVM compatibility meant I could use familiar tools like Hardhat, ethers.js, and MetaMask without any friction. Sub-second finality made testing fast and satisfying.

The most rewarding part was deploying the Escrow contract and seeing real on-chain dispute resolution work end-to-end with three separate wallets sender, recipient, and arbiter.

I'm planning to keep building on ArcNexus. Next steps include better UI polish, more token support, and potentially a mainnet deployment.

If you have feedback, questions, or want to collaborate find me on X or open an issue on GitHub!

I built a full-stack DeFi app on Arc Testnet bridge, swap, and escrow

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