🪙 How to pay for Crypto Wallet Viewer usage time with USDC

aWhy pay with USDC

The only payment method for this service is USDC.When you pay with USDC, everything up to adding the usage time proceeds automatically as soon as the transfer is confirmed on the blockchain. The JPY equivalent is recorded at the rate at the time of purchase, and you can get a receipt (PDF) from the purchase history on the "Payment" screen.

USDC is pegged to the US dollar, so the amount converted to JPY varies with the exchange rate.

bWhat you need (a wallet)

• A Crypto Wallet Viewer account (sign up with an email address and a password, and confirm with the link sent by email)
• A wallet that can send USDC. After logging in, the wallets you can choose under "Connect wallet" at the top right of the screen are: Uniswap Wallet（Ethereum） / MetaMask（Ethereum） / Trust Wallet（Ethereum） / Jupiter Wallet（Solana）
• The currency of that network, used to pay the transfer fee (gas)

To buy, you need a browser wallet extension or the browser inside a wallet app. For connections from wallet apps on smartphones and tablets, there are combinations of wallet and device that we have not been able to check.

"Connect wallet" for payment and registering wallets to view are separate things. Crypto Wallet Viewer never asks you to enter a private key or seed phrase (recovery words).

cUSDC and supported networks

This page is for people who already have USDC. It does not explain how to obtain USDC.

The only currency you can pay with is USDC. Supported networks: Ethereum / Solana

You cannot pay with USDC on networks not listed above (including USDC on Arbitrum, Base, Polygon and others) or with currencies other than USDC.

dSteps to pay

1. Sign up for an account, open the confirmation link sent by email, and log in.
2. Press "Connect wallet" at the top right of the screen, choose a wallet, and connect it.
3. Open the "Payment" screen, choose the period to buy, and press "Buy".
4. Check the amount and network shown on the confirmation screen and in your wallet, and approve the transfer yourself.
5. Once the transfer is confirmed on the blockchain, the time is added to your usage time.

The USDC received is converted to usage time as soon as the transfer is confirmed on the blockchain. There is no mechanism for holding it for you as a USDC balance.

Usage time starts running from the moment of purchase (it also runs while you are not logged in). If you buy more while time remains, it is added after your current expiry time.

The receiving address is not shown on this page. Please send the transfer from "Buy" on the "Payment" screen after logging in.

ePrices and fees

• "1 month" is 720 hours of usage time (not a calendar month). It is not a monthly contract and does not renew automatically.
• When you sign up for an account, 1 hour of usage time is added free.
• Prices may change without notice. Please check the prices on the "Payment" screen before buying.
• The blockchain transfer fee (gas) is paid by you. The amount depends on the network and how busy it is at the time.

fIf you make a mistake, or the time is not added

• A blockchain transfer cannot be cancelled after it is sent. A transfer to the wrong network or address may not be recoverable.
• USDC is built so that its issuer (Circle) can, under its terms, block the transfer of USDC to and from a specific address. We cannot block or reverse a transfer ourselves.
• For transfers made from "Buy", the destination is set by the service. If your wallet is on an unsupported network and cannot be switched, the process stops without sending.
• Usage time is calculated from the amount of USDC actually received. Any amount received above the price of the chosen period also becomes usage time, and if less is received, you get only the time for the amount received.
• In the calculation, the amount is applied to the price list starting from the longest period, and the remainder is converted to minutes at the price for 1 hour (2 USDC) (fractions of a minute are dropped). Transfers of less than 0.01 USDC do not become usage time.
• After the transfer, the screen keeps checking automatically. If you close the screen partway, open the "Payment" screen again and it will look for and pick up the transfer from the connected wallet.
• If the time is still not added, please contact us with the transaction hash (for Solana, the signature) from your wallet's history.
• Usage time that has been purchased cannot be refunded or cancelled (including unused time). For the terms, please see the Legal notice (Specified Commercial Transactions Act) (in Japanese).

gIf you do not have a wallet

Paying with USDC requires a wallet. If you do not have a wallet, the steps on this page do not apply to you.

As a screen that needs neither sign-up nor payment, there is the JPY / USD conversion of crypto assets (Crypto Rate Viewer).