Marketplace Gas-Free Listing Helper

WHAT IT DOES

Marketplace Gas-Free Listing Helper watches the current marketplace page for NFT listings and the user's wallet address, reads the user's token holdings and approval status from the NFT contract via eth_call, identifies which NFTs the user holds that can be listed gas-free, checks marketplace gas-free listing eligibility (such as OpenSea's gas-free listings), calculates the gas savings from using gas-free listing, and displays alerts with eligible NFTs, gas savings, and execution recommendations when gas-free listing opportunities are detected. The tool scans the page for NFT listings, reads the user's wallet address, checks token holdings and approval status, identifies eligible NFTs for gas-free listing, calculates gas savings, and provides recommendations.

WHERE IT RUNS

The tool runs as a panel inside your browser on OpenSea marketplace pages at https://opensea.io/*. It works on any OpenSea page displaying NFT listings. The tool connects to your real EVM wallet extension (MetaMask, WalletConnect, or any wallet injecting window.ethereum) to read on-chain data via eth_call and the ethers library loaded at runtime. No data is sent to any external server; all reads happen directly from the blockchain through your wallet provider.

HOW TO USE

Install the BotGentz extension, navigate to OpenSea with your wallet connected, and open the Marketplace Gas-Free Listing Helper panel. Set your minimum gas savings threshold in USD (default $5) — the tool will only flag NFTs where gas savings exceed this amount. Select your listing type filter from the dropdown — All NFTs or Eligible only — to control which NFTs are displayed. Choose your alert preference — Panel only, Browser notification, or Both. Toggle "Auto-check on page load" if you want the tool to analyze automatically when you open the panel. Click "Check Gas-Free" — the tool scans the page for NFT listings, reads your wallet address, checks your token holdings and approval status, identifies eligible NFTs for gas-free listing, calculates gas savings, and displays a comprehensive analysis with recommendations. When gas-free listing opportunities are detected, the tool triggers alerts with NFT details and gas savings. Click "Refresh" to manually update the gas-free analysis.

MECHANISM — GAS-FREE LISTING ELIGIBILITY DETECTION WITH GAS SAVINGS CALCULATION

This tool uses a gas-free listing detection engine that identifies NFTs eligible for gas-free listing and calculates gas savings. The system first connects to window.ethereum and requests the user's wallet address. It scans the page for NFT listings using DOM selectors for item cards and listing details. For each NFT, the tool checks if the user owns the token by reading the token holdings from the NFT contract via eth_call (using the balanceOf function). It checks the approval status by reading the approval data from the NFT contract, and checks marketplace gas-free listing eligibility by analyzing the contract's support for gas-free listing mechanisms (such as Wyvern or Seaport). The gas savings are calculated by estimating the gas cost of a standard listing transaction minus the gas cost of a gas-free listing. The urgency classification uses a multi-tier system: ELIGIBLE (NFT is owned, eligible, and gasSavings ≥ threshold), OWNED (owned but not eligible), or NOT OWNED. Recommendations are generated based on the eligibility status, helping users save on gas costs when listing NFTs.

THE PANEL

The BotGentz panel is fully draggable, allowing you to position it anywhere on your screen without obstructing the OpenSea interface. It includes per-site position memory, so the panel returns to your preferred location each time you visit the marketplace. Snap-to-edge functionality lets you dock the panel to any side of the browser window. The panel collapses to a compact icon when not in use and expands with a single click. You can resize it to your preferred dimensions, and pressing the Escape key instantly closes the panel. All interactions are smooth and intuitive, designed to work alongside your NFT listing workflow.

PLEASE NOTE

This tool requires the free BotGentz extension and a real EVM wallet extension (such as MetaMask) already installed in your browser. EVM chains only — currently supports Ethereum mainnet. This is a monitoring and analysis tool only — it does not execute listing transactions automatically. The tool cannot guarantee that the displayed eligibility status matches the exact moment of execution due to on-chain latency. It cannot account for gas price changes during execution. It cannot read listing data from marketplaces not supported by the tool. It cannot verify listing eligibility beyond on-chain data. It cannot predict future gas prices or listing opportunities. It cannot read private wallet information or listing intentions. All blockchain reads are performed directly through your wallet provider; no data is stored or transmitted beyond your browser. Websites change their layouts and content structures regularly; while we continuously update the extraction logic, some pages may require script updates. Always verify all NFT details, eligibility status, and gas savings independently before taking any action based on the dashboard.