Fuzemon

1inch Fusion+ integration with Monad Testnet.

Approach

We wanted to add support for Monad Testnet to 1inch Fusion+. To do that, we first recreated the contracts architecture by deploying the AggregationRouterV6, EscrowFactory and Resolver contracts on both Ethereum Sepolia and Monad Testnet. Here are the deployed addresses:

Ethereum Sepolia:

• AggregationRouterV6: 0x111111125421cA6dc452d289314280a0f8842A65
• EscrowFactory: 0xf11b79631d6c74ef2e3142d20b37ded4f5f5b324
• Resolver: 0x358Ea7c8EF1Bd0922cAE6C41ea1c8a8Ea2d754Cd

Monad Testnet:

• AggregationRouterV6: 0xCAEa711010565904d3427b74794e3F36c191a6e7
• EscrowFactory: 0x65c169Cef9904499788FE61ea708EB6F99C34Ff6
• Resolver: 0xb0CC0006662f91f7cEEf48eE444330f1B7A67D35

We then created a signed order according to the CrossChainOrder struct provided by the @1inch/cross-chain-sdk. In the example below, we wanted to transfer 100 USDC from Ethereum Sepolia to Monad Testnet, to facilitate the onboarding on the most popular trading apps on the Monad ecosystem, such as Gorillionaire.

const order = Sdk.CrossChainOrder.new(
                new Address(src.escrowFactory),
                {
                    salt: Sdk.randBigInt(1000n),
                    maker: new Address(await srcChainUser.getAddress()),
                    makingAmount: parseUnits('100', 6),
                    takingAmount: parseUnits('99', 6),
                    makerAsset: new Address(config.chain.source.tokens.USDC.address),
                    takerAsset: new Address(config.chain.destination.tokens.USDC.address)
                },
                {
                    hashLock: Sdk.HashLock.forSingleFill(secret),
                    timeLocks: Sdk.TimeLocks.new({
                        srcWithdrawal: 10n,
                        srcPublicWithdrawal: 120n,
                        srcCancellation: 121n,
                        srcPublicCancellation: 122n,
                        dstWithdrawal: 10n,
                        dstPublicWithdrawal: 100n,
                        dstCancellation: 101n
                    }),
                    srcChainId,
                    dstChainId,
                    srcSafetyDeposit: parseEther('0.001'),
                    dstSafetyDeposit: parseEther('0.001')
                },
                {
                    auction: new Sdk.AuctionDetails({
                        initialRateBump: 0,
                        points: [],
                        duration: 120n,
                        startTime: srcTimestamp
                    }),
                    whitelist: [
                        {
                            address: new Address(src.resolver),
                            allowFrom: 0n
                        }
                    ],
                    resolvingStartTime: 0n
                },
                {
                    nonce: Sdk.randBigInt(UINT_40_MAX),
                    allowPartialFills: false,
                    allowMultipleFills: false
                }
            )