PropRail

USDC payout rail for prop-trading firms. Built on Arc Testnet, powered by Circle Bridge Kit and CCTP V2.

Prop-trading firms pay their funded traders in USD-equivalent amounts, often to traders scattered across jurisdictions. PropRail gives them a one-page dashboard to fund a treasury, issue payouts with expiry, and hand traders a claim link. The trader opens the link, picks which chain they want their USDC on, and signs once. Circle's CCTP V2 handles the crosschain delivery; the trader doesn't need gas on the destination chain.

Live

• Contract (verified): 0xF46E0b43AEf82114DA8a8F62D66bb7b63D3b00b7 on Arc Testnet
• Demo: https://proprail.vercel.app

How it works

1. Prop firm admin funds the treasury on Arc, creates payouts (one-off or batch from CSV), and shares claim links with traders
2. Trader opens their claim link, picks a destination chain, signs once
3. Contract burns USDC on Arc via CCTP V2
4. Bridge Kit polls Circle's attestation service and submits the destination-chain mint via the Orbit forwarder
5. Trader receives native USDC on their chosen chain with no destination-chain gas required

Why Arc + Bridge Kit

• USDC-as-gas on Arc means the prop firm funds the treasury in one asset and pays fees in the same asset. No second token to source.
• CCTP V2 via Bridge Kit means the trader gets native USDC on their chosen chain, not a bridged wrapper. With the Orbit forwarder, the trader does not need ETH on the destination chain.
• Single-signature UX — the trader signs once on Arc; Circle infrastructure handles everything downstream.

Features

• Admin dashboard with live treasury balance, committed vs unallocated USDC, deposit/withdraw flow
• Single and batch payout creation (upload a CSV for bulk airdrops)
• Live payout history reading onchain events (topic-filtered, chunked for RPC limits)
• Shareable claim links per payout at /claim/[id]
• Crosschain claim flow — trader picks Base Sepolia, Ethereum Sepolia, or Arbitrum Sepolia
• Owner-gated admin access — dashboard reads the contract's owner() and locks out other wallets
• Payout expiry — firm can reclaim expired payouts

Tech stack

Layer	Choice
Smart contract	Solidity 0.8.22, OpenZeppelin 5.1.0, Foundry
Frontend	Next.js 16 (App Router), Tailwind CSS 4
Wallet	RainbowKit 2 + wagmi 2 + viem 2
Crosschain	@circle-fin/bridge-kit 1.8.3 + @circle-fin/provider-cctp-v2
Chain	Arc Testnet (chain id 5042002, USDC as gas)

Contract

PayoutEscrow.sol is a small escrow (about 200 lines) with these responsibilities:

• Treasury: owner deposits and withdraws USDC
• Payout commitments: owner creates pending payouts with (trader, amount, reference, expiry)
• Claim: trader calls claim(payoutId, destinationDomain, mintRecipient, maxFee, minFinalityThreshold). The contract approves Circle's TokenMessengerV2 and calls depositForBurn, burning USDC on Arc and emitting a CCTP message for the destination chain.
• Reclaim: owner can cancel any expired pending payout

Access control via OpenZeppelin Ownable. Reentrancy-guarded on claim(). 16 Foundry tests covering happy paths, access control, and invariants — all passing.

Local development

# Clone
git clone https://github.com/Makabeez/proprail.git
cd proprail

# Frontend
npm install
# create .env.local with NEXT_PUBLIC_WALLETCONNECT_PROJECT_ID and NEXT_PUBLIC_PAYOUT_ESCROW_ADDRESS
npm run dev

# Contract (optional - a deployed instance is already live on Arc Testnet)
cd contracts
forge install
forge test

Repo layout

contracts/                         Foundry project
  src/
    PayoutEscrow.sol               main contract
    interfaces/ITokenMessengerV2.sol
  test/PayoutEscrow.t.sol          16 tests

src/
  app/
    admin/page.tsx                 admin dashboard page
    claim/[id]/page.tsx            trader claim page
  components/
    admin/                         Treasury, CreatePayout, PayoutHistory
    claim/                         ClaimForm, ClaimProgress, ClaimSuccess
  lib/
    bridge/                        Bridge Kit integration
    abi/payoutEscrow.ts            contract ABI
    chains.ts                      wagmi chain def for Arc Testnet
    contracts.ts                   deployed contract addresses

Roadmap

• Vercel deploy + live demo URL
• claimToSelf() variant for traders who want USDC on Arc directly
• Solana Devnet as a claim destination (Bridge Kit supports it)
• Custom fee routing for firms taking a payout fee
• EURC payouts (Arc supports EURC natively)

License

MIT.

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Built in the open to explore Circle's Arc + Bridge Kit stack. Feedback welcome — open an issue or ping @Makabeez.