Building a Zero-Gas-Fee Blockchain Traceability System for WooCommerce & Shopify on Polygon

Hieu Luong — Fri, 05 Jun 2026 07:54:07 +0000

Building a Zero-Gas-Fee Blockchain Traceability System for WooCommerce & Shopify on Polygon

In modern agriculture, cosmetics, and luxury goods, transparency is no longer a luxury—it's a compliance requirement. Consumers want to scan a QR code and instantly verify a product's origin, quality certificates, and supply chain journey.

However, building a blockchain-backed traceability app for e-commerce merchants (like WooCommerce and Shopify) presents a massive challenge: Gas fees.

If a merchant has to pay $0.20 in gas fees for every single product they register on-chain, it ruins the margins.

In this article, I will detail how we designed and built HimiTrace (developed by HimiTek Studio), a decentralized compliance and traceability solution, achieving a 99.9% reduction in gas costs while maintaining absolute cryptographic truth on the Polygon Blockchain.

The Problem: Blockchain Write Overhead

A traditional decentralized application (dApp) interacts directly with the blockchain by asking the client (via MetaMask or WalletConnect) to sign transactions.

For e-commerce merchants, this approach is dead on arrival:

Bad UX: Merchants cannot sign a MetaMask pop-up every time a product is added or updated in WooCommerce/Shopify.
Predictable Gas Costs: Businesses require flat-rate pricing (e.g., $9.99/month), not volatile transaction fees in MATIC/ETH.

The Architecture: Relayer & Batching Gateway

To solve these UX and cost bottlenecks, we designed a centralized API Gateway on a high-availability Oracle VPS that acts as a secure relayer.

Store (WooCommerce / Shopify App) sends a REST API request to API Gateway.
API Gateway registers metadata on IPFS and submits signed batch writes to the Polygon Smart Contract using our pool wallet.
Polygon Contract returns the Transaction Hash back to the store.

1. Gas Wallet Management (Relayer Pattern)

Instead of forcing merchants to maintain their own MATIC/Polygon wallets, the HimiTrace API Gateway maintains a centralized relayer wallet. When a merchant registers a product, the gateway wraps the request, pays the gas fee from our pool, signs it server-side, and executes the smart contract write.

2. High-Efficiency Batching (Reducing Transactions)

To further cut costs, we implemented a bulk-processing queue. Instead of submitting individual writes, we batch up to 50 product registrations into a single contract call:

// Simplified Solidity registerBatch function
function registerBatch(
    string[] memory _productIds, 
    string[] memory _names, 
    string[] memory _origins, 
    string[] memory _owners
) public onlyOwner {
    for (uint i = 0; i < _productIds.length; i++) {
        require(products[_productIds[i]].timestamp == 0, "Product already registered");
        products[_productIds[i]] = Product({
            name: _names[i],
            origin: _origins[i],
            ownerName: _owners[i],
            timestamp: block.timestamp,
            blockNumber: block.number
        });
        emit ProductRegistered(_productIds[i], _names[i], _origins[i]);
    }
}

By batching, the gas overhead of transaction initiation (21,000 gas) is paid only once, reducing the average cost per product to less than $0.0005 (essentially free for the merchant).

Implementing the WooCommerce / Shopify Clients

The clients are built to consume this API Gateway seamlessly.

WooCommerce Plugin (PHP): Hooked into WooCommerce settings, limiting free users to 5 products per month and allowing Pro users to run bulk registration.
Shopify App (Remix + Prisma + Polaris): Fully embedded in the Shopify Admin area, checking merchant subscription states using the Shopify Billing API before allowing contract writes.

Both plugins save the returned tx_hash (transaction hash) to the product's metafields and generate a print-ready QR code pointing to a public verification portal.

Lessons Learned

Keep Smart Contracts Minimal: Don't store large files on-chain. Store raw certificates on IPFS, and save only the IPFS cryptographic hash (CID) on the blockchain.
Implement API Gatekeepers: Since the gateway pays the gas, rate-limiting and billing state verification are critical to prevent gas-draining attacks.

Conclusion

By abstracting blockchain complexity and handling transaction relayer logic, we've enabled B2B merchants to offer absolute transparency to their consumers with a 1-click install. HimiTrace is currently undergoing WordPress.org and Shopify App Store reviews.

If you are interested in exploring how we automate B2B compliance workflows or if you want to request a custom integration for your ERP, feel free to visit HimiTek Studio and book a discovery call.

Have you integrated blockchain writes into traditional web applications? What scaling issues did you encounter? Let's discuss in the comments below!

DEV Community: Hieu Luong

Building a Zero-Gas-Fee Blockchain Traceability System for WooCommerce & Shopify on Polygon

Building a Zero-Gas-Fee Blockchain Traceability System for WooCommerce & Shopify on Polygon

The Problem: Blockchain Write Overhead

The Architecture: Relayer & Batching Gateway

1. Gas Wallet Management (Relayer Pattern)

2. High-Efficiency Batching (Reducing Transactions)

Implementing the WooCommerce / Shopify Clients

Lessons Learned

Conclusion