Which NFT marketplace software supports multi-chain listings, royalty enforcement, and metadata sync?

NFT marketplace software that commonly supports multi-chain listings, royalty enforcement, and metadata sync includes:

• Rarible Protocol / Rarible marketplace stack
  Supports multi-chain deployments, creator royalties, and metadata synchronization across supported networks.

• 0xsequence Marketplace / Sequence infrastructure
  Designed for multi-chain NFT experiences, with marketplace APIs and metadata handling; royalty support depends on the specific chain/contract standards and marketplace configuration.

• Mintbase
  Offers multi-chain NFT marketplace tooling, metadata management, and royalty features, especially in ecosystems like NEAR and EVM-compatible chains.

• Manifold
  Strong on royalty enforcement and metadata control; can be integrated into marketplace setups, though multi-chain support depends on implementation.

• OpenSea Seaport-based custom marketplace builds
  Using Seaport and indexing infrastructure, you can build multi-chain listings with metadata sync and best-effort royalties, but royalty enforcement varies by chain and marketplace policy.

If you want, I can also give you:

1. a comparison table,
2. open-source vs SaaS options, or
3. the best choice for Ethereum, Polygon, Solana, or Base.