Billing and Zaryn credits

Zaryn is paid in **USDC**, the regulated US-dollar stablecoin issued by Circle. You top up **Zaryn credits**, a prepaid dollar balance, and credits pay for Premium. ## Zaryn credits - **1 credit = 1 US dollar**, always. Prices are in dollars. - Credits live in your Zaryn account. They are not a token: they can't be transferred to someone else or cashed out. - Premium is bought from credits, for a month or a year, and **renews automatically** from your balance (you can turn that off). A day before Premium ends without enough credits, you get a notice. - Organizations have their own credits: owners and admins top them up and buy Premium for the whole organization. - Your **history** lists every top-up, charge, refund and bonus, with the balance after each, and every payment has a printable **receipt**. ## Paying with USDC On the **Billing** page choose an amount and a network, then **Get payment details**: | Network | How to pay | |---|---| | **Solana** | Scan the QR code or open the link in a Solana wallet (Phantom, Solflare, Backpack…). It's a Solana Pay request: the amount, the address and the invoice's reference are filled in for you. | | **Base** (and other Ethereum-compatible networks) | Scan or open the link in an Ethereum wallet (Coinbase Wallet, MetaMask, Rabby…), or send **exactly** the amount shown to the address shown. The amount has a unique tail of a few millionths of a dollar: that's how Zaryn knows which invoice it pays, so send it to the last digit. | Send **only USDC**, only on the network you chose. Payments are credited once the network finalizes them, usually well within a minute, and the page updates by itself. - **Paid late?** A payment that arrives after the invoice's timer still counts. - **Paid less?** What arrived is credited; top up the rest. - **Paid the wrong amount on Base, or without an invoice?** It's kept safe for review: contact support with the transaction and it will be credited. ## Security Zaryn never holds keys that can move your money or ours: payments go to the company's multisig treasury, and Zaryn's servers only read the blockchain. Every transfer is credited exactly once, and every balance change is a permanent ledger entry. Payments from addresses on sanctions lists are not credited automatically; they are held for review, as the law requires.