Live on Base · Coinbase tokenized stocks
A $1 card.
A real stock inside.
Every card holds a random slice of SpaceX, Tesla, or NVIDIA worth $0.10 to $10. Open it to find out which. Send it to a friend to let them find out.
Contract not deployed yet.
You pay Base gas (a few cents). Approve USDC once, then mint.
The odds, exactly as the contract enforces them
Every number below is read live from the contract. Nothing is hidden.
| Prize inside | Odds | Roll range (of 10,000) |
|---|---|---|
| $0.10 | 28% | 0 – 2799 |
| $0.25 | 24% | 2800 – 5199 |
| $0.50 | 20% | 5200 – 7199 |
| $1.00 | 17% | 7200 – 8899 |
| $2.00 | 7% | 8900 – 9599 |
| $5.00 | 3% | 9600 – 9899 |
| $10.00 | 1% | 9900 – 9999 |
The roll comes from Pyth Entropy, a verifiable random number, hashed with your card number. No single prize can exceed 25% of the pool, so the top tier pays less while the pool is small.
How it works
- STEP 1Mint
Pick a quantity and pay in USDC on Base. Each card is a sealed NFT in your wallet.
- STEP 2Keep or send
Sealed cards move freely. Send any number of them to a friend's wallet from your profile with one signature.
- STEP 3Open
Open up to 10 at once. A verifiable random number decides the prize and which stock, and the tokens land in your wallet instantly.
Questions
What is inside a card?+
A random slice of one real tokenized stock: SpaceX, Tesla, NVIDIA. These are Coinbase-issued tokens on Base, one token per share, redeemable through Coinbase. The prize is worth between the smallest and largest tier in the odds table, priced at the Chainlink feed when you open.
How is the prize decided?+
When you open, the contract requests a random number from Pyth Entropy. The number is unknown to everyone, including us, until it arrives. It is hashed with your card number to pick a tier from the published table and a stock weighted by what is in each vault. You can verify every step on Basescan.
Can I lose money?+
Yes. Most cards are worth less than you paid, some are worth more, and the average return is printed above and enforced onchain. Treat it as a fun way to hold your first tokenized stock, not as an investment.
What happens to a card I never open?+
Sealed cards expire 365 days after mint. Expired cards pay nothing. Your profile shows a countdown on every sealed card.
Can I trade or gift a card?+
Sealed cards are normal ERC-721 tokens: send them from your profile or trade them anywhere. Once a card is opened it becomes non-transferable, a permanent record of what you won.
What do I pay besides the card price?+
Base gas for each transaction, usually a cent or two, and a small fee for the random number when you open, about 0.00002 to 0.00003 ETH. We do not take anything from the prize.
Where is the money?+
Inside the contract. It holds the USDC from sales and the three stock vaults. It cannot pay out more than it holds, no single prize can exceed 25% of the pool, and the operator can only withdraw what sits above the reserve needed for every sealed card.
Who can use this?+
Coinbase tokenized stocks are available to eligible non-US users. By minting you confirm you are allowed to hold them where you live. This site does not verify eligibility.