When listing an item on Solana from a backend, use the listItem helper method to call the listVirtual or listNft based on whether the item id is a mint pubkey or virtual id.
await carbon.methods.listItem({
itemId,
collectionMint,
price: lamports,
expiry // unix timestamp or 0 if no expiration
})
Frontend
Listing Virtual Items
Since the marketplace authority needs to validate any virtual items being listed, the listVirtual method requires a signature from the marketplace authority. The transactions.listVirtual method can be used to generate a signed transaction to be sent back to the seller for their signature.
// ...User requests a list virtual transaction
// Backend
const signedTx = await carbon.transactions.listVirtual({
seller,
itemId,
collectionMint,
price,
expiry,
})
const responseBody = {
tx: signedTx.serialize({
// Seller still needs to sign
requireAllSignatures: false,
verifySignatures: false
}).toString('base64'),
}
// ...Send responseBody back to seller for signature
// Frontend
const tx = Transaction.from(Buffer.from(responseBody.tx, 'base64'));
const signedTx = await anchorWallet.signTransaction(tx)
const serialized = signedTx.serialize()
const signature = await conn.sendRawTransaction(serialized)
Listing NFTs
When listing an item that's already been minted as an NFT, it's much more straightforward.
// It's convenient to use metaplex to fetch the collection address if needed
const nft = await metaplex.nfts().findByMint({
mintAddress,
})
await carbon.methods.listNft({
seller: anchorWallet,
mint: mintAddress,
collectionMint: nft.collection!.address,
price: lamports,
expiry, // unix timestamp or 0 if no expiration
})
