Sell credits

The marketplace trades only CCT (ERC-20). Credits you hold as NFTs must be wrapped first. Proceeds arrive as payment token, minus the 0.25 % default trading fee. If the payment token ever refuses a transfer to you, the proceeds are held by the marketplace and a Claim banner appears.

Prerequisites

Wallet connected on the right network with gas ETH.
At least one non-retired NFT credit that carries a registry serial and an oracle proof hash. There is no free starter pack: credits come from an authorized issuer (who mints them to your wallet) or from buying CCT on the marketplace.
Credit methodology must match the CCT pool the marketplace uses (VERRA_VCS on the Robinhood deployment).

Steps

Open Sell Credits

Go to /app/sell-credits. The Need Wrapping card shows tonnes you hold as NFTs but not yet as CCT.

Wrap an NFT to CCT

With a CCT balance of zero, the Create Listing tab lists up to five of your NFTs. Click Wrap to CCT. Your wallet signs two transactions in order:

CarbonCreditNFT.setApprovalForAll(CarbonCreditToken, true)
CarbonCreditToken.wrapCredit(tokenId)

The NFT is locked in the CCT contract and you receive CCT equal to its tonnes (1 NFT of 1 tonne = 1 CCT). Wrap more NFTs to increase your balance.

Create a fixed-price listing

Select Fixed Price, enter the amount (at most your CCT balance) and a price per tonne in USD. The app converts the price to payment token base units using the token's decimals() ($15 = 15000000 for 6-decimal payment token). The price must be at least the marketplace minimum. The form shows Expected Revenue.

Approve CCT and submit

Click Create Listing. If your CCT allowance for the marketplace is below the amount, the wallet first asks for CCT.approve. Then createSellOrder(amount, pricePerTonne, 0, false) locks your CCT in the marketplace. Orders created here never expire and never require KYC.

Track or cancel

The app switches to Active Listings. Cancel calls cancelOrder(orderId) and returns the unfilled CCT. When buyers fill the order, payment token is sent to you automatically on each fillOrder.

For a timed sale instead, see Run an auction.

If it fails

Symptom	Cause
No Wrap to CCT button	You have no non-retired NFT credits in the wallet (already wrapped, retired, or none minted).
`Methodology mismatch`	NFT methodology differs from this CCT pool.
`Already wrapped` / `Not NFT owner`	Token already locked, or not yours.
"Insufficient CCT balance" in the form	Amount exceeds your CCT balance.
Listing missing after creation	Event window: only the last 20,000 blocks are read; refresh, and check Troubleshooting.

Reference: Sell Credits page · CarbonCreditToken

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