A headless marketplace is a type of headless app that facilitates trading without its own dedicated user interface. It operates by integrating with existing platforms and crypto wallets, enabling transactions through familiar digital spaces. 

Key aspects include:

- No central interface: Functions through other platforms
- Integration: Works with existing wallets and user accounts
- Accessibility: Users interact where they're already active
- Flexibility: Can be accessed through various front-ends

Examples: Bountycaster on Farcaster, decentralized exchanges with multiple interfaces, NFT markets via social media bots.