NFT Counter-Offer Auto-Responder

WHAT IT DOES

NFT Counter-Offer Auto-Responder watches the current page for incoming NFT offers, reads offer details (price, token ID, buyer, expiry) from the marketplace contract via eth_call, and automatically responds with counter-offers based on user-defined rules (e.g., minimum price threshold, percentage markup, fixed counter-offer price), with options to auto-accept or auto-decline. It ensures you never miss a negotiation opportunity and can respond instantly to offers.

WHERE IT RUNS

This tool operates as a userscript within the BotGentz extension framework, running directly in your browser on any website. It works on any EVM-compatible blockchain page—Ethereum, Polygon, Arbitrum, Optimism, and more—where NFT marketplaces support offers and counter-offers. The tool integrates seamlessly into your workflow, appearing as a draggable panel that stays accessible as you manage NFT negotiations.

HOW TO USE

Enter the marketplace contract address and the NFT contract address in the "Contract Setup" section. Configure your response rules: set the minimum offer price threshold, choose your counter-offer strategy (counter-offer, accept, or decline), set the markup percentage or fixed counter-offer price, and set the maximum number of responses per session. Set the refresh interval and toggle notifications before responding on or off. Click "Connect & Start Responder" to connect your real wallet extension, which will begin checking for incoming offers at your specified interval. The panel displays the response count and status updates. You'll be prompted before each response if notifications are enabled. Use "Check Now" for an immediate check, "Reset Counter" to reset the response count, or "Stop Monitoring" to disconnect.

TECHNICAL OPERATION

NFT Counter-Offer Auto-Responder uses raw JSON-RPC calls via window.ethereum.request() to interact with the blockchain. It loads ethers at runtime using a simple script tag injection for ABI encoding and contract interactions. The tool reads incoming offer details from the marketplace contract using eth_call with the appropriate view functions. It analyzes each offer against the user-defined rules: checking the offer price against the minimum threshold, then applying the selected strategy (accept, decline, or counter). For counter-offers, it calculates the counter price using either the fixed price or the markup percentage applied to the original offer. The tool submits counter-offer transactions via eth_sendTransaction when rules are met. It tracks the number of responses to enforce the max responses limit and avoids duplicate responses.

THE PANEL

The NFT Counter-Offer Auto-Responder panel is fully draggable and remembers its position between sessions using GM_setValue. It snaps to the edge of the viewport for a clean interface and can be collapsed to a small icon when not in use. The panel is resizable to accommodate longer content. Press Escape to quickly close or collapse the panel. The design is optimized for productivity with a dark theme, clear visual hierarchy, and responsive controls that adapt to your workflow.

PLEASE NOTE

This tool requires the free BotGentz extension installed in your browser and a real EVM wallet extension (MetaMask, Rabby, etc.) already installed. EVM chains only—this does not work on non-EVM blockchains. The tool cannot read offers if the marketplace does not expose a view function for them, cannot respond to offers if the marketplace does not support counter-offers, cannot execute if the user lacks sufficient funds, and cannot predict if the seller will accept the counter-offer. No private keys are stored or transmitted—all signing happens directly through your wallet extension. Always verify the response rules and offer details before enabling auto-response.