Wallets, page 2.
The customer side of paying in USDC on Solana: wallets, approvals, warnings, cancelling a subscription and staying safe.
Phantom and Solana wallet warnings: "This transaction may be unsafe" explained
Phantom's simulation warning means the wallet could not predict what a transaction will do, and its new-domain notice means Phantom has not reviewed the site yet; neither is a finding that the transaction is malicious. Phantom's FAQ lists three causes for its simulation warning: more than one signer, a transaction close to Solana's size limit, and a transaction that would fail. Treat any warning as a reason to read the request yourself, and on a Fianto checkout a one-off payment should show only the Total leaving in USDC plus a small SOL fee.
WalletsWhy your wallet doesn't show at checkout
A Fianto checkout shows only the Solana wallets that announce themselves to the page through the Wallet Standard, and it can pay only with those that can sign a transaction without sending it. A wallet that is installed in another browser, switched off, blocked in a private window or open only on your phone does not appear as installed; one that appears with the tag "Cannot sign here" can only sign and send in one step. The fix is to open the page where the wallet runs, or to pay with a wallet that offers sign-only signing.
WalletsBusiness crypto wallets: hot, hardware and multisig for receiving USDC
Most businesses taking USDC are better served by two wallets than by one: a receiving wallet whose own key can sign a message, because that signature is how Fianto proves the wallet is yours, and a savings wallet that a single compromised computer cannot empty. A software wallet, or a hardware wallet if your setup can sign Fianto's message, fits the receiving role. A Squads multisig vault is a strong home for savings, but Fianto has not verified that a vault can complete the wallet proof, so plan to receive into a single-key wallet and move money to the vault on a schedule.
SolanaWalletsHow to close empty token accounts on Solana and get SOL back
Closing an empty token account on Solana sends the SOL it holds as rent back to an address you choose, about 0.00149 SOL for a standard 165-byte account opened at today's rate (measured 15 October 2026). Only accounts with a zero token balance can be closed. Keep the USDC account you pay subscriptions from and the one your business gets paid into: with Fianto, a closed payer account fails the next renewal as a counted failure, and a merchant wallet without one cannot take a single new checkout.
WalletsAddress poisoning on Solana: how lookalike addresses get into your history
Address poisoning is a scam in which someone sends a tiny transfer or a fake token to your wallet from an address made to look like one you use, hoping you later copy it from your transaction history and send real money to it. It needs no access to your wallet and no signature from you until the moment you pay the attacker yourself. On Solana the defence is simple and strict: never pick an address from history; copy it from the source that created it, compare the whole string, and for addresses you send to again and again, save them once.
WalletsComparePhantom vs Solflare vs Backpack for paying with USDC on Solana
All three can pay a USDC checkout on Solana: as of 15 October 2026 the Phantom, Solflare and Backpack browser extensions each register sign-only transaction signing through the Wallet Standard, which is what Fianto's checkout needs. The real differences are elsewhere: which browsers and hardware wallets each vendor lists, whether the wallet is Solana-only, and how the checkout hands a payment to the app on a phone. Pick by those, not by a ranking; if you already hold USDC in one of them, use that one.
WalletsSeed phrase vs private key vs wallet address, explained for merchants
Think of them as three generations of one secret. The seed phrase is a list of 12 to 24 words from which a wallet derives every private key it holds; each private key controls exactly one address and signs for it; the address is the public half of that key, the part you hand out to get paid. Only the address is ever meant to be shared. Fianto asks for nothing more than the address and a signature made in your wallet, never the phrase and never a key.
WalletsCan a merchant take more than I approved? Crypto subscription approval limits
No. A USDC subscription paid through Fianto runs on the Solana Foundation's Subscriptions program, which lets a collection through only if it stays within the cap for the period, the price plus the fees, and goes to a wallet the plan names. Your wallet may still list the approval as unlimited, because one approval is shared by every subscription your wallet pays through the program; the limits sit in each subscription's on-chain terms, not in that approval.