📁 Prerequisites
| Item | Description |
|---|---|
| MetaMask Wallet | A crypto wallet to create and sign your NFT |
| ETH or MATIC | Needed to pay gas fees (ETH for Ethereum; MATIC for Polygon — which is often free to mint) |
| NFT Content | Your digital asset (image, video, audio, 3D, etc.) |
🛠️ How to Publish an NFT (on OpenSea)
✅ Step 1: Set up MetaMask Wallet
Go to https://metamask.io and install the browser extension.
Create a new wallet and save your recovery phrase securely.
Add some ETH to your wallet (buy or transfer from an exchange like Coinbase or Binance).
⚠️ For Polygon (cheaper), you’ll need MATIC tokens and to switch your network in MetaMask.
✅ Step 2: Connect MetaMask to OpenSea
Visit https://opensea.io
Click Profile (top right) → Choose MetaMask
Approve connection in MetaMask — your OpenSea account is now tied to your wallet
✅ Step 3: Create a Collection (Optional)
Go to your profile → My Collections
Click Create a Collection
Add:
Logo
Description
Royalties (% you’ll earn on resales)
Blockchain (Ethereum or Polygon)
✅ Step 4: Mint (Publish) Your NFT
Click Create (top menu)
Upload your file (image, video, audio, or 3D model)
Fill in:
Name
Description
External link (optional)
Properties, levels, unlockable content (optional)
Blockchain: Ethereum or Polygon
Click Create — your NFT is now minted!
✅ On Polygon, this is free. On Ethereum, you may need to pay a one-time "initialize account" fee if it’s your first time.
✅ Step 5: List Your NFT for Sale
Go to your newly minted NFT page
Click Sell
Set:
Price (fixed or timed auction)
Duration (e.g., 7 days)
Click Complete Listing
MetaMask will pop up → sign (and possibly pay gas fee if on Ethereum)
🎉 Done! Your NFT is Now Live on OpenSea
Share your NFT link on social media, Discord, or marketplaces
Buyers can now purchase it directly from OpenSea
🧠 Tips
| Tip | Why It Matters |
| Use Polygon for low fees | No gas fees to mint or list NFTs |
| Add royalties | You’ll earn % on every resale |
| Include unlockable content | Useful for private files, perks, etc. |
| Verify NFT visibility | May take a few minutes to appear |
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