NFT Offer Maker

WHAT IT DOES

NFT Offer Maker lets you create buy offers on multiple listed NFTs across supported marketplaces in a single batched transaction. Instead of making offers one by one—each requiring separate gas fees and wallet confirmations—you add the NFTs you want to bid on with your desired prices and expiration times, check their listing status, and execute all offers at once. The tool handles marketplace-specific offer creation interfaces, saving gas and simplifying the bidding process for NFT collectors and traders.

HOW TO USE

Connect your EVM wallet and select the network. Enter the marketplace contract address (e.g., OpenSea Seaport, Blur) that supports buy offers. In the offer input area, list each NFT you want to bid on using the format: contract,tokenId,price,expiration (price in wei, expiration as Unix timestamp). Click "Add offers" to load them, then click "Check listings" to verify that each NFT is currently listed for sale—the tool checks the owner or listing status on the marketplace. Review the status, then click "Make offers" to create buy offers for all listed NFTs at the specified prices. The tool approves any required native token spending and submits the offers via the marketplace contract.

TECHNICAL MECHANISM

The tool first checks the listing status of each NFT by inspecting the owner—if the NFT is owned by a non-zero address, it is considered listed. It then uses the marketplace contract's offer creation interface—typically a function that accepts parameters like the NFT contract, token ID, offer price, expiration, and the offerer's signature. The tool encodes the offer data for each NFT and submits them in a batched transaction via multicall or the marketplace's native batch function. Native token approvals are handled to ensure the marketplace can escrow the offer funds. Gas costs are reported using receipt.effectiveGasPrice and progress feedback is provided during the process.

WHAT IT CANNOT SEE

This tool cannot create offers for NFTs that are not listed or not owned by the seller—listing status is verified before proceeding. It relies on the marketplace supporting offer creation via its contract interface; marketplaces that do not expose an offer function or use off-chain order books are not supported. The tool does not handle offers that require additional signatures, collateral, or whitelisting. Gas costs scale with the number of offers made, which can be significant for large batches.

PLEASE NOTE

Offers typically require the marketplace to escrow the bid amount—ensure you have sufficient native tokens (ETH, BNB, etc.) to cover all offers. Offers expire at the specified timestamp; if the seller does not accept the offer before expiration, your funds are released. The marketplace contract must be trusted; verify its security and audit status before use. This tool is for EVM chains only and does not support non-EVM networks.