How StarPort Works

A peer-to-peer NFT marketplace on Soneium. List for free, trade trustlessly.

01

Connect Your Wallet

Connect MetaMask or any WalletConnect-compatible wallet. Make sure you are on the Soneium network.

02

Browse or List NFTs

Explore listed NFTs in the marketplace, or go to "My NFTs" to list your own. Listing is free — no gas required.

03

Sign to List (Free)

To list an NFT, you sign an EIP-712 message with your wallet. No transaction is sent — your signature is stored off-chain. Zero gas cost.

04

Buyer Executes the Trade

When someone buys your NFT, they send the transaction on-chain. The smart contract verifies your signature, transfers the NFT, and sends you ETH — all in one atomic step.

05

Make & Accept Offers

Buyers can make offers by signing off-chain. NFT owners can accept any offer, which executes the trade on-chain. Offers expire automatically.

06

Fees

StarPort charges a 5% platform fee on each completed sale, deducted automatically by the smart contract. Royalties are also paid to creators if supported.

Trade Flow

Seller                    StarPort DB               Buyer
  │                            │                       │
  ├── sign EIP-712 (free) ──▶  │ store signature       │
  │                            │                       │
  │                            │  ◀── browse listing ──┤
  │                            │                       │
  │                    Smart Contract                   │
  │                            │  ◀── buyNFT() + ETH ──┤
  │                            │                       │
  │    verify signature ───────┤                       │
  │    check ownerOf ──────────┤                       │
  │                            │                       │
  ◀── receive ETH (95%) ───────┤                       │
                               │──── NFT ─────────────▶│
                               │──── 5% fee ──▶ StarPort

FAQ

Is listing really free?

Yes. Listing only requires an off-chain signature — no blockchain transaction, no gas fee.

What happens if I transfer my NFT after listing it?

The smart contract checks ownership at the time of purchase. If you no longer own the NFT, the transaction will revert automatically and the buyer pays no ETH.

Can I cancel a listing?

Yes. You can cancel at any time before a buyer executes it. Cancellation invalidates your signature so the listing can never be filled.

Which tokens are supported?

Currently ETH (native currency on Soneium) is supported for all trades.

Is the smart contract audited?

An audit is planned before mainnet launch. The contract is a custom EIP-712 implementation — not a fork — allowing a full audit at lower cost.

Ready to start trading?

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