// Help center
Learn once. Transact with confidence.
Everything you need to use the apps safely: from what a testnet is to how to fill in every field.
Testnet vs Mainnet: rehearsal and opening night
Before using real money, run the same operation on Sepolia. It’s free, it’s identical and it will save you costly mistakes.
Test network · Sepolia
- Free
- Test coins have no real value.
- Risk-free
- Perfect for learning and making mistakes.
- Identical
- Works exactly like the real network.
- Faucets
- Get free test ETH in minutes.
Main network · Ethereum / Polygon
- Real
- Transactions carry real economic value.
- Costs gas
- You need ETH or POL to pay network fees.
- Irreversible
- Once confirmed, there’s no going back.
- Production
- For real, commercial, final use.
Get Sepolia ETH for free
A faucet hands out small amounts of test coins to use on testnets. Connect your MetaMask, follow the instructions and you’ll receive about 0.05 Sepolia ETH: enough for plenty of test transactions.
Open the Google Cloud faucetTrust, but verify
A serious platform publishes its contract code. Here’s how to check in five steps:
- 01
Find the contract address
Paste it into Etherscan.io (or Polygonscan for Polygon).
- 02
Open the “Contract” tab
It should show the green ✓ “Verified” check.
- 03
Review the source code
Under “Contract Source Code” you can read exactly what it does.
- 04
Look for sensitive functions
mint, burn, pause, blacklist… and who can call them.
- 05
Check the standard
It should follow ERC-20 (tokens) or ERC-721 (NFTs).
App guides
01 Create a Token
- 01
Token name
The full name wallets and explorers will display.
Tip: E.g. “Aurora Project Coin”.
- 02
Symbol
A 3–5 character ticker, like BTC or ETH.
Tip: Check on Etherscan that it can't be confused with a well-known token.
- 03
Total supply
The total number of tokens that will ever exist.
Tip: E.g. 1000000 for one million. You can't mint more after deployment.
- 04
Decimals
How finely each token can be divided.
Tip: Keep 18: it's the standard wallets and exchanges expect.
- 05
Network
Sepolia for testing; Ethereum or Polygon for production.
Tip: Always run a full test on Sepolia first.
02 Free NFT Minting
- 01
File
The image, video or audio that will become your NFT.
Tip: Formats: JPG, PNG, GIF, MP4 and MP3. Recommended: under 100 MB.
- 02
Name
The title of the work, shown on marketplaces.
Tip: E.g. “Sunrise over the Sierra #1”.
- 03
Description
The story of the work: technique, inspiration, edition.
Tip: A good description builds buyer confidence.
- 04
Traits (optional)
Attributes such as color, rarity or style.
Tip: Very useful if you're building a collection.
- 05
Royalties
The percentage you earn on every resale.
Tip: Typically between 2.5% and 10%.
- 06
Network
Ethereum for maximum compatibility; Polygon for minimal gas.
Tip: Try Sepolia first if it's your first NFT.
03 File Certification
- 01
File
Select the document you want to certify.
Tip: Any format works: PDF, image, audio, video…
- 02
Title
A descriptive name for the certificate.
Tip: E.g. “Lease agreement – Unit 4B – 2026”.
- 03
Description
Context for the file: author, date, license.
Tip: The more precise, the more useful as evidence.
- 04
Network
Sepolia to test; Ethereum for the definitive certificate.
Tip: Only certification on Ethereum counts as a real record.
04 Bulk Sender
- 01
Token address
The contract of the token you're sending.
Tip: Copy it from Etherscan or CoinGecko; never type it by hand.
- 02
Recipients
One line per recipient: address,amount.
Tip: E.g. 0x12…ab,100 · 0x56…ef,250
- 03
Network
The network the token lives on.
Tip: A Polygon token can only be sent on Polygon.
- 04
Review
Check the summary before signing.
Tip: Make sure the total matches what you expect to send.
05 Airdrops
- 01
Token to distribute
The contract of the token you're giving away.
Tip: It must be in your wallet, in sufficient quantity.
- 02
Recipients
The addresses that will receive tokens.
Tip: Upload a CSV or paste them, one per line.
- 03
Amount per user
Same for everyone or custom per address.
Tip: Work out the total before launching.
- 04
Criteria
Conditions each recipient must meet.
Tip: E.g. holding a specific NFT or another token.
- 05
Date
Immediate or scheduled distribution.
Tip: Announce it to your community in advance.
06 NFT Viewer
- 01
Wallet address
The public address or .eth name to analyze.
Tip: Read-only: no need to connect your wallet.
- 02
Network
The network to search for NFTs.
Tip: Most popular collections live on Ethereum.
- 03
Filter (optional)
Limit the search to one collection.
Tip: Leave it empty to see everything.
07 Wallet Mail
- 01
Email or phone
Enter the email or number you want to sign in with.
Tip: Use an email account protected with two-factor authentication.
- 02
Magic Link
Open the link or code you receive to sign in.
Tip: Never forward that link to anyone.
- 03
Your wallet
Check your address and balances.
Tip: For large amounts, consider moving funds to MetaMask or a hardware wallet.
09 Token Swap
- 01
Network
Ethereum or Polygon to trade; Sepolia to practice.
Tip: Do your first swap on Sepolia.
- 02
From token
The token you give and the amount.
Tip: Keep some ETH or POL to pay for gas.
- 03
To token
The token you want to receive.
Tip: Check the contract address to avoid fake tokens.
- 04
Confirmation
Review the estimated price and sign in your wallet.
Tip: If the token is new to the app, you'll need to approve it first.
Six habits that keep you safe
- 01
Copy and paste addresses
Never type them by hand, and check the first and last characters.
- 02
Test on Sepolia first
Rehearse any important operation before doing it for real.
- 03
Use verified contracts
If the code isn’t public, don’t interact with it.
- 04
Guard your seed phrase
No legitimate service will ever ask for it. Not even us.
- 05
Review before signing
Read what your wallet shows: amount, network and destination.
- 06
Keep gas in reserve
Always hold some ETH or POL to pay network fees.
Don’t have a wallet yet?
For most operations we recommend MetaMask: free, self-custodial and compatible with every app. If you’d prefer something simpler, start with Wallet Mail using just your email.
Straight answers.
Do I need to know how to code to create a token or an NFT?
No. You fill in a form with your token or NFT details and the platform generates and deploys the smart contract for you. All you need is a wallet like MetaMask to sign the transaction.
How much does it cost?
You can try everything for free on the Sepolia testnet using test ETH. On mainnet you pay the Ethereum or Polygon network fee (gas) and, depending on the app, a small fee shown before you sign.
Is it safe? Do you have access to my funds?
You sign every transaction from your own wallet, and we will never ask for your seed phrase or private keys. Contracts follow the ERC-20 / ERC-721 standards and are publicly verified so anyone can audit them.
What’s the difference between Testnet and Mainnet?
The testnet (Sepolia) is a test network identical to the real one, but its coins have no value: ideal for practising risk-free. Mainnet (Ethereum or Polygon) is the real network, with real costs and irreversible transactions.
Ethereum or Polygon? Which should I choose?
Ethereum offers maximum compatibility and reputation; Polygon offers much lower fees and fast confirmations. For large collections or frequent transfers, Polygon is usually the better choice.
Do you build custom solutions?
Yes. We design and build smart contracts, dApps, DAOs, marketplaces, bridges and real-world asset tokenization, and audit third-party contracts. Tell us about your project through the form and we’ll send you a quote.
Where does the news come from?
They are automatically selected from specialist media worldwide and refreshed every hour. Each item shows a summary and links to its original source.