Universal Multi-Chain Top-Up

Mercenta eliminates liquidity isolation by integrating Circle Cross-Chain Transfer Protocol (CCTP) V2, allowing instant, zero-slippage USDC deposits directly into Arc Mainnet (5042) wallets from 5 major networks.

1. Supported Source Networks

Network	Transfer Rail	Typical Finality	Slippage
Base	Circle CCTP V2 Native	~30 seconds	0.00% (1:1)
Solana	Circle CCTP V2 Native	~45 seconds	0.00% (1:1)
Arbitrum One	Circle CCTP V2 Native	~30 seconds	0.00% (1:1)
Polygon PoS	Circle CCTP V2 Native	~90 seconds	0.00% (1:1)
Ethereum	Circle CCTP V2 Native	~3 minutes	0.00% (1:1)

2. Architecture & Security Guarantees

Unlike legacy cross-chain bridges that rely on lock-and-mint wrapped tokens or vulnerable liquidity pools, Mercenta's top-up pipeline uses native burn-and-mint:

[Source Chain (e.g. Base)]                  [Arc Mainnet (5042)]
User Wallet (USDC)                          Recipient Arc Wallet
        │                                           ▲
        ▼                                           │
 Circle TokenMessenger (Burn)               Circle MessageTransmitter (Mint)
        │                                           ▲
        ▼                                           │
  Circle Attestation Service ───────────────────────┘
  (Cryptographically Signed Burn Attestation)

Zero Wrapped Token Risk: USDC is destroyed on the source chain and minted natively on Arc. No synthetic or wrapped tokens are created.
Zero Price Slippage: Transfers settle at exact $1.000000 = $1.000000 parity minus static network gas fees.
Hardware Nonce Verification: Every transfer carries a unique Circle transfer nonce to prevent replay attacks across chains.

3. Dynamic Quote API

Autonomous agents and client storefronts calculate real-time deposit estimates using the /api/liquidity/crosschain-quote endpoint:

GET /api/liquidity/crosschain-quote?source=base&amount=100&recipient=0x9ED9...B5760

Example Response:

{
  "source": "base",
  "destination": "arc-mainnet",
  "depositAmount": "100.00",
  "bridgeFeeUsdc": "0.00",
  "estimatedGasUsdc": "0.15",
  "netCreditedUsdc": "99.85",
  "estimatedDurationSec": 35,
  "cctpVersion": "v2-burn-and-mint",
  "depositContract": "0x123...CCTP",
  "quoteExpiry": 1793400000
}

4. UI Integration

Universal Top-Up is accessible across Mercenta interfaces:

Mercenta Console: Full institutional panel at /onramp and /earn.
Telegram Web App (@mercentabot): Direct multi-chain modal embedded in the non-custodial wallet manager (TgTopUpModal.tsx).