DEV Community

Typelex
Typelex

Posted on

Bypassing AMM Slippage: How Typelex Uses On-Chain Atomic Swaps for MEV-Proof OTC Trading

#blockchain #crypto #web3 #fintech

If you’ve ever built or interacted with DeFi protocols, you know the mathematical limitations of Constant Product Market Makers ($x \times y = k$). While AMMs are great for retail liquidity, executing a large transaction (e.g., $100,000+) directly against a liquidity pool triggers two major issues:

  1. Severe Slippage: The marginal price of the asset degrades exponentially relative to the trade size.
  2. MEV Exploitation (Sandwich Attacks): Public mempool transactions are highly vulnerable. Front-running bots will buy the asset ahead of your execution block, push the price up to your maximum slippage limit, and dump it immediately after.

To solve this without relying on centralized, custodial desks or risky off-chain escrow setups, we built Typelex—a decentralized, non-custodial P2P OTC protocol.

Here is a look at how we bypassed the AMM bonding curve entirely using on-chain atomic swaps.

The Architecture of an On-Chain Atomic Swap

Instead of routing trades through active liquidity pools, Typelex utilizes isolated smart contracts to execute peer-to-peer trades. The entire swap happens atomically: either all conditions are met within a single block execution, or the entire transaction reverts.

Conceptual Smart Contract Logic (Solidity-based)

To understand how the trustless escrow works under the hood, here is a simplified mental model of the swap execution logic:

struct Order {
    address maker;
    address taker; // address(0) if public
    address tokenA;
    uint256 amountA;
    address tokenB;
    uint256 amountB;
    bool active;
}

mapping(uint256 => Order) public orders;

function takeOrder(uint256 orderId) external {
    Order storage order = orders[orderId];
    require(order.active, "Order not active");
    if (order.taker != address(0)) {
        require(msg.sender == order.taker, "Unauthorized taker");
    }

    order.active = false;

    // Pull Token B from Taker to Maker
    IERC20(order.tokenB).transferFrom(msg.sender, order.maker, order.amountB);

    // Push Token A from Contract Escrow to Taker
    IERC20(order.tokenA).transfer(msg.sender, order.amountA);

    emit OrderExecuted(orderId, msg.sender);
}
Enter fullscreen mode Exit fullscreen mode

Why This Design is Inherently MEV-Proof

By shifting the execution model from AMMs to fixed-rate P2P swaps, Typelex mitigates common mainnet exploits:

  • Zero Slippage Parameters: Because the exchange rate between Token A and Token B is hardcoded directly into the order struct, there is no price slippage to exploit. MEV searchers cannot sandwich the transaction because the contract will strictly revert if the exact amounts are not cleared.

  • No Spot Market Footprint: The transaction occurs entirely within the Typelex contract storage states, moving balances directly between the maker's and taker's wallets. No public liquidity pools are touched, meaning the spot price on external trackers remains completely unaffected.

  • Direct Cryptographic Access Control: For private trades negotiated off-chain, the maker can assign a cryptographic constraint (locking the swap to a specific taker address). Even if a malicious bot views the transaction pending in the mempool, any attempt to hijack or front-run the execution will fail the msg.sender validation check on-chain.

Primary Use Cases for Web3 Developers and DAOs

  • Treasury Diversification: DAOs can liquidize or diversify native project tokens into stablecoins without signaling market dumps or feeding MEV bots.

  • Strategic OTC Rounds: Projects can distribute allocations to early investors or partners securely on-chain, ensuring tokens are locked or routed directly to validated contributor wallets.

  • Gas-Optimized Settlement: By bypassing complex routing paths and multi-hop pool swaps, transactions consume minimal gas, keeping execution costs flat even during network congestion.

Conclusion

We designed Typelex to bring security and structural integrity back to high-volume on-chain trading. By moving OTC completely on-chain, we remove the need to trust intermediaries or centralized escrow services.

Top comments (0)