NFT Loan Collateral Value Overlay

WHAT IT DOES

NFT Loan Collateral Value Overlay is a specialized browser extension panel that continuously monitors the NFT collection you're currently viewing across major marketplaces and aggregators. It reads live floor price data, collection statistics, and market depth directly from Ethereum-compatible blockchains using eth_call against trusted oracle contracts and marketplace routers. The overlay calculates your estimated collateral value for NFT-backed loans by factoring in the current floor price, applicable loan-to-value (LTV) ratios from major lending protocols, collection liquidity metrics (24h volume, sales count, unique holders), and volatility adjustments. It displays a clear, concise panel showing estimated maximum loan amount, competitive interest rate ranges, collateral health percentage, and liquidation price thresholds—all updated in real-time as market conditions change.

WHERE IT RUNS

This overlay operates on any webpage that displays NFT collection data, including OpenSea, Blur, LooksRare, X2Y2, Rarible, Magic Eden (EVM sections), and NFT aggregators like Gem and Genie. It integrates with the BotGentz extension framework, running in a sandboxed content script context that respects the host page's CSP policies. The panel appears as a floating overlay that stays pinned to your viewport as you navigate collection pages, mint pages, and analytics dashboards.

HOW TO USE

After installing the extension, navigate to any supported NFT marketplace page displaying a collection. The overlay automatically activates and begins fetching on-chain data. You can drag the panel to any screen position using the grab handle at its top edge. Click the refresh button to force an immediate price oracle update. The panel collapses to a minimal status bar when not in active use, expanding on hover or click. Press the Escape key to temporarily dismiss the panel; it reappears when you navigate to a new collection page. The panel remembers your preferred position and expansion state across browsing sessions.

MECHANISM: DIRECT-READ ORACLE AGGREGATION WITH STALE-PRICE REJECTION

Unlike typical portfolio trackers that rely on REST APIs with 30-60 second delays, this overlay constructs and executes multicall batch requests directly against Chainlink price feeds, Uniswap V3 TWAP oracles, and NFT marketplace royalty routers. It implements a stale-price rejection window configurable from 30 to 300 seconds, falling back to the most recent validated block timestamp when primary oracles are unresponsive. The collateral calculation uses a weighted median of up to five independent data sources, discarding outliers beyond 2.5 standard deviations. This ensures you see the actual executable loan value—not a cached estimate—before you initiate a borrowing transaction.

THE PANEL

The overlay panel is fully draggable via its title bar and remembers its position per-site using localStorage. It snaps to the nearest edge when dragged within 40px of any screen boundary, with configurable snap resistance. The panel supports three size states: compact (shows only estimated loan amount and health), expanded (full metrics including LTV, liquidation price, and collection stats), and collapsed (a thin 32px bar showing a colored health indicator only). Resize handles on the bottom-right corner allow width adjustment between 240px and 480px. Pressing Escape dismisses the panel until the next page navigation or manual reactivation via the extension toolbar button.

PLEASE NOTE

This extension requires the free BotGentz framework extension (available in the Chrome Web Store) to be installed and active. You must also have a real EVM-compatible wallet extension (such as MetaMask, WalletConnect, or Coinbase Wallet) already installed in your browser—the overlay uses your wallet's RPC provider to make eth_call requests. This tool works exclusively with Ethereum Virtual Machine chains including Ethereum mainnet, Polygon, Arbitrum, Optimism, and Base. Because marketplaces and oracle contracts frequently update their interfaces and smart contract addresses, the overlay's data-fetching scripts may require periodic updates. We commit to releasing compatibility updates within 48 hours of any reported major marketplace or oracle contract change. No private keys, wallet balances, or browsing history are ever collected, transmitted, or stored—all data fetching is performed directly from your local wallet RPC provider to public blockchain nodes.