KDDI au · Japan
Top up KDDI au in
Japan
Refill any KDDI au prepaid line in Japan with cryptocurrency. We support 3 fixed denominations from 3,000 up to 10,000 JPY, settled to the carrier within minutes of your crypto deposit confirming on chain. No account, no KYC, no app.
Last updated ·
- 3
- fixed amounts
- 3,000–10,000
- JPY · amount range
- JPY
- local currency
- under 60s
- typical ETA
KDDI au denominations
Live face values you can buy now. Prices charged in JPY at the carrier rate; you pay the crypto equivalent at the rate of the moment.
Or pick a custom amount
KDDI au accepts custom top-ups between 1,571.15 and 10,000 JPY. Use the form above to enter any value in that range.
About KDDI au in Japan
KDDI au is one of the 5 prepaid networks operating in Japan, with the dial code +81. Refills are denominated in JPY and settle on the carrier under 60 seconds after our payment confirms on chain.
You don't need a KDDI au account, the Japan MyCarrier app, a local bank or any in-store kiosk — just the phone number and the crypto. The credit shows up on the SIM exactly the same way as if you'd topped it up at a corner store.
KDDI au mobile top-up · FAQ
Can I top up KDDI au with Bitcoin?
Yes. Pay in Bitcoin (BTC), Monero (XMR), Ethereum (ETH), USDT (TRC/ERC/SOL), Litecoin (LTC), Bitcoin Cash (BCH), Solana (SOL), Dogecoin (DOGE), Dash (DASH), Tron (TRX) or BNB. The KDDI au line in Japan gets credited within minutes of your deposit confirming on chain.
How fast does the KDDI au credit land?
Carrier-side, KDDI au typically posts the credit within 30 seconds of our settlement message. End-to-end (you click pay → SIM has credit) it's usually 1-3 minutes on fast chains (LTC, TRX, SOL), up to 10 minutes on slower ones (BTC).
What's the cheapest crypto for a KDDI au refill?
For small refills (under $50 USD-equivalent), USDT-TRC20, Tron (TRX), Litecoin (LTC) or Solana (SOL) keep network fees to single cents. Bitcoin works fine but BTC fees can be disproportionate for small top-ups — pick a cheaper chain instead.
Do I need a KDDI au or Japan account?
No. We talk to KDDI au on the back end with the phone number alone. No MyKDDI au portal login, no SIM swap, no local bank, no in-store kiosk. Just enter the number, pick the amount, pay in crypto.
Will KDDI au or the recipient see I paid in crypto?
No. KDDI au sees a routine top-up at the local face value (JPY). The recipient sees the new balance on their SIM. Neither sees the funding source, your email, or any other payment metadata. From the SIM's side it's identical to a corner-store refill.
Other prepaid networks in Japan
Pick a different carrier in Japan — same workflow, same coins, same speed.