Module: NFT Marketplace - Advanced NFT Trading and Auction Platform

[grantfox-oss]

Purpose

Implement a comprehensive NFT marketplace module enabling P2P NFT trading, auctions, royalty enforcement, and collection management with integrated payment settlement across multiple currencies.

Direction / Tasks

• Create NFTMarketplace contract supporting ERC721 and ERC1155 standards
• Implement fixed-price listings with configurable currency support (USDC, XLM, wrapped tokens)
• Build English auction system with bid increments, auto-extension, and hammer-down mechanics
• Add Dutch auction support with time-based price decay
• Implement royalty enforcement at transaction level with configurable splits
• Create collection management with metadata pinning to IPFS
• Support offer-based trading (make/accept offers with time limits)
• Add bulk listing/trading for efficient collection management
• Implement escrow for payments with release on NFT transfer
• Create marketplace fees with governance-controlled splits (platform/creator/collection)

Acceptance Criteria

• Fixed-price listings allow immediate purchase at specified price
• English auctions properly track bids with current highest bidder
• Auction auto-extends if bid received in final minutes
• Dutch auctions show accurate current price based on time decay
• Royalties deducted and distributed to creators per royalty split
• NFT transferred to buyer only after payment confirmed
• Payment escrow holds funds until transfer completion
• Collection metadata stored and retrievable with verified IPFS hashes
• Offers can be created, accepted, or cancelled within time windows
• Bulk operations execute atomically for all items
• Marketplace fees deducted accurately and distributed per splits
• 100% unit test coverage including auction edge cases (multiple bidders, extensions)
• Fuzzing tests for price calculation accuracy in Dutch auctions
• Security audit for escrow fund management and royalty enforcement

Implementation Notes

• Support NFT standards from Stellar's native NFT ecosystem
• Implement lazy royalty system for gas efficiency
• Use IPFS for metadata storage with fallback gateway support
• Support multi-currency pricing with Oracle integration for conversion rates
• Design for 10,000+ NFT collections with efficient indexing

[uadamu00005-netizen]

Hi Maintainer,

I’m a full-stack developer, and I’d like to contribute to the task. I’ll implement it carefully and efficiently thoroughly understand requirements and edge cases
Communicate promptly about suggestions or improvements. And I will provide regular progress updates and address blockers
Align with project goals through feedback and clarification.

Thank you,

[grantfox-oss]

🦊 GrantFox — @uadamu00005-netizen has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #62)
2. Your PR will be reviewed by the SourceXXL maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Third Campaign campaign!

@uadamu00005-netizen's PR #63 was approved and merged by @memplethee-lab.

🏆 @uadamu00005-netizen: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (373 total points). Track your full progress on GrantFox.

👏 Great work, @uadamu00005-netizen! Keep contributing to SourceXXL.