Best Bid Best Offer Overlay

WHAT IT DOES

Best Bid Best Offer Overlay watches the current marketplace page for NFT listings, reads the NFT's contract address and token ID from the page, reads the current best bid and best offer from the marketplace or contract via eth_call, calculates the spread between bid and ask, identifies the best bid/best offer opportunities, and displays an overlay with bid/ask prices, spread, volume, and execution recommendations when favorable bid/ask spreads are detected. The tool scans the page for NFT listings, reads contract addresses and token IDs, reads current best bid and best offer prices, calculates the spread, identifies opportunities with favorable spreads, 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 Best Bid Best Offer Overlay panel. Set your minimum spread threshold percentage (default 5%) — the tool will only flag listings where the spread between bid and ask exceeds this value. Set your maximum bid/ask ratio (default 0.9) — the tool will only flag listings where the bid price is at least this percentage of the ask price. 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 "Scan Bid/Ask" — the tool scans the page for NFT listings, reads current best bid and best offer prices, calculates the spread, identifies favorable opportunities, and displays a comprehensive analysis with recommendations. When favorable bid/ask spreads are detected, the tool triggers alerts with bid/ask prices and spread details. Click "Refresh" to manually update the bid/ask analysis.

MECHANISM — BID/ASK SPREAD DETECTION WITH OPPORTUNITY SCORING

This tool uses a bid/ask spread detection engine that reads order book data and identifies trading opportunities. 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, extracting contract addresses and token IDs. For each NFT, the tool reads the current best bid and best offer from the marketplace order book or contract via eth_call. It calculates the spread as a percentage: spread = ((ask - bid) / ask) * 100. The tool also calculates the bid/ask ratio: bidPct = (bid / ask) * 100. The opportunity classification uses a multi-tier system: FAVORABLE (spread ≥ threshold and bidPct ≥ ratio * 100), MODERATE (some conditions met), or NOT FAVORABLE (conditions not met). Recommendations are generated based on the spread and ratio, helping users identify profitable bid/ask opportunities.

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 trading 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 trade transactions automatically. The tool cannot guarantee that the displayed bid/ask prices match the exact moment of execution due to market changes. It cannot account for slippage or price impact during execution. It cannot read order book data from marketplaces not supported by the tool. It cannot verify order validity or authenticity. It cannot predict future price movements or market trends. It cannot read private wallet information or trading 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 bid/ask prices, spreads, and trading opportunities independently before taking any action based on the dashboard.