Cards you sponsor
Sign in with the wallet you gave Sippar when your cards were issued. You see each card it controls, its balance, every purchase on chain and whether its developer has connected it. You can add money to a card from your wallet, take a card's money back, or turn off Sippar's access.
Use a plain wallet such as MetaMask, Rabby or Trust Wallet. A smart account (Coinbase Smart Wallet, the Base app) can see its cards but cannot approve a withdrawal or turn off Sippar's access: Crossmint, which holds the cards, accepts approvals only from a plain wallet.
No cards are controlled by this wallet. A card belongs to the wallet named when it was issued; if that was another wallet, sign in with that one.
Every movement of money into or out of your cards, read from the chain: what you added, each purchase, refunds from Sippar, and withdrawals back to you.
| When | Card | What | Amount |
|---|
Adding money is a plain USDC transfer from your wallet to the card, which your wallet shows and pays the network fee for. Sippar holds no key that can withdraw from a card or change who controls it. Its own key can only pay Sippar, only for the products the card opens, and only up to the card's daily limit. Balances and purchases are read from each card's chain; the product name beside a purchase is Sippar's own record.