Stablecoins as a Service (SaaS)

Stablecoins as a Service (SaaS) are white-label stablecoin instances deployed through FraxNet's BrandedFactory. Each SaaS stablecoin is a fully collateralized ERC-20 token backed 1:1 by frxUSD, with native cross-chain support via LayerZero.

Core Components

Component	Description
Branded Token	ERC-20 stablecoin with a uniform address across all deployed chains
BrandedCustodian	ERC-4626 vault holding frxUSD collateral for minting and redeeming the branded token
CrossChainRouter	LayerZero-based bridge enabling cross-chain branded token transfers
BrandedFactory	Factory contract that deploys and maps tokens to their custodian and router

How It Works

A branded stablecoin is deployed through the BrandedFactory, which creates the token, custodian, and router contracts using deterministic CREATE2 addresses.
Users mint branded tokens by depositing frxUSD into the BrandedCustodian. The custodian maintains a 1:1 backing ratio.
Users bridge branded tokens cross-chain via the CrossChainRouter, which redeems the token for frxUSD, sends it via LayerZero, and re-mints on the destination chain.
Users redeem branded tokens back to frxUSD at any time through the custodian.

Deployed Chains

Branded stablecoins are deployed across 20 EVM chains with uniform contract addresses:

Chain	Chain ID	LayerZero EID
Ethereum	1	30101
Fraxtal	252	30255
Arbitrum	42161	30110
Avalanche	43114	30106
Base	8453	30184
BSC	56	30102
Ink	57073	30339
Katana	747474	30375
Linea	59144	30183
Monad	143	30390
Mode	34443	30260
Optimism	10	30111
Plume	98866	30370
Polygon	137	30109
Scroll	534352	30214
Sei	1329	30280
Sonic	146	30332
Stable	988	30396
Unichain	130	30320
World Chain	480	30319

Example: USSD (US Sonic Dollar)

USSD is the first branded stablecoin deployed through this system.

Contract	Address
USSD Token	`0x000000000eCcFf26B795F73fb0A70d48da657fEf`
Custodian	`0x54E14489646fD9693ea5071cb5DFeb1F5Afa8f03`
CrossChainRouter	`0x2F30BeF74c1F7572a3ea5e101d1f587287d06C94`
BrandedFactory	`0x63E89638743a409e2389F06A3f778a4570314d7D`

Minting Example (Solidity)

IERC20 frxUSD = IERC20(custodian.asset());
uint256 amount = 1000e18;
 
frxUSD.approve(address(custodian), amount);
uint256 brandedTokensReceived = custodian.deposit(amount, msg.sender);

Minting Example (TypeScript)

import { parseUnits } from "viem";
 
const custodianAddress = "0x54E14489646fD9693ea5071cb5DFeb1F5Afa8f03";
const frxUsdAddress = "0x..."; // frxUSD on the target chain
const amount = parseUnits("1000", 18);
 
// Approve custodian to spend frxUSD
await walletClient.writeContract({
  address: frxUsdAddress,
  abi: erc20Abi,
  functionName: "approve",
  args: [custodianAddress, amount],
});
 
// Deposit frxUSD to mint branded tokens
const brandedTokensReceived = await walletClient.writeContract({
  address: custodianAddress,
  abi: custodianAbi,
  functionName: "deposit",
  args: [amount, userAddress],
});

Redeeming Example (Solidity)

uint256 brandedAmount = 500e18;
uint256 frxUsdReceived = custodian.redeem(brandedAmount, msg.sender, msg.sender);

Bridging Example (Solidity)

uint32 dstEid = 30101; // Ethereum
address recipient = msg.sender;
uint256 amount = 100e18;
 
IERC20(brandedToken).approve(address(router), amount);
uint256 nativeFee = router.quote(dstEid, recipient, amount);
router.send{value: nativeFee}(dstEid, recipient, amount);

Bridging Example (TypeScript)

import { parseUnits } from "viem";
 
const routerAddress = "0x2F30BeF74c1F7572a3ea5e101d1f587287d06C94";
const brandedTokenAddress = "0x000000000eCcFf26B795F73fb0A70d48da657fEf";
const dstEid = 30101; // Ethereum
const amount = parseUnits("100", 18);
 
// Approve router to spend branded tokens
await walletClient.writeContract({
  address: brandedTokenAddress,
  abi: erc20Abi,
  functionName: "approve",
  args: [routerAddress, amount],
});
 
// Quote LayerZero fee
const nativeFee = await publicClient.readContract({
  address: routerAddress,
  abi: routerAbi,
  functionName: "quote",
  args: [dstEid, userAddress, amount],
});
 
// Send cross-chain
await walletClient.writeContract({
  address: routerAddress,
  abi: routerAbi,
  functionName: "send",
  args: [dstEid, userAddress, amount],
  value: nativeFee,
});

Factory Lookup

To look up the custodian and router for any branded token:

(address custodian, address router, ) = BrandedFactory(
  0x63E89638743a409e2389F06A3f778a4570314d7D
).brandedTokenToUtils(brandedTokenAddress);

FraxNet Custodians Branded Custodian