How to add your card to Grok and subscribe
Grok plans are bought on grok.com. Card number, expiry, CVC and billing address are in your card email.
Some plans are half price for the first month and full price after that. Before the renewal date, keep the full price plus the $1 fee on the card — this is the most common reason Grok charges fail.
Subscriptions bought in the iPhone or Android app go through Apple or Google Play and cannot use this card. Subscribe on the web.
Steps
- 1
Check the plans
Open grok.com/supergrok in a browser. The screenshot shows Plus / Premium / Super / Ultra in CAD (opened in Canada); plan names and prices are whatever the page shows you.
grok.com plans (signed out) - 2
Sign in
Sign in to grok.com — an X account works.
xAI sign-in page accounts.x.ai (mobile browser, email masked) Image source: Cursor Forum (link). If this infringes your rights, email [email protected] and we will remove it right away. - 3
Pick a plan and enter the card
On the payment page enter the card number, expiry, CVC and billing address from your card email, then confirm.
SuperGrok checkout (2025, Chinese UI): choosing Card opens the card number, expiry, CVC and billing address fields (email masked; red box by the original author) Image source: littlemagic8.github.io (link). If this infringes your rights, email [email protected] and we will remove it right away. - 4
Check it worked
Your subscription shows in your grok.com account settings, where you can also change the card or cancel.
grok.com Settings → Subscription → Manage your subscription (2025 design; red marks by the original author) Image source: littlemagic8.github.io (link). If this infringes your rights, email [email protected] and we will remove it right away.
X Premium also includes Grok usage and is paid in X settings — screenshots coming.
xAI API credits (console.x.ai): the API is prepaid credits deducted by usage, separate from the subscription above. Sign in at console.x.ai, open Billing → API spend management, choose Purchase credits, enter the amount, and on the payment page enter the card number, expiry, CVC and billing address from your card email. xAI says prepaid credits can currently only be bought through this Guest Checkout page; the card is saved after the first purchase.
The xAI API can auto top-up: when credits drop below your threshold it charges the card (at least $5 each time), with an optional monthly cap. If the card balance is short the charge fails — and a failed charge still costs $1. If you turn it on, set a monthly cap and keep enough on the card, or top up by hand.
Suggested balance (tax included)
- $15 charges (the most common on our cards): keep at least $19 on the card. 23 were charged at $15 and 17 came to $15.6–17.3 with tax, plus the $1 fee per charge (based on real charges on our cards over the last 60 days).
- $30 charges: keep at least $34. On our cards 3 were $30 and 4 came to $31.2–32.7 with tax. On plans with a half-price first month, month two is charged at full price — keep the full price before renewal.
- Other plans: keep the tax-included total shown on the payment page plus $1.
Plans and prices as shown on the official page: grok.com/supergrok
If the balance is short, the charge is declined — and a failed charge still costs $1.
Common reasons it fails
Why Grok / xAI charges on our cards failed over the last 60 days (share of failed charges):
- About 86%: not enough balance — mostly the full-price second month after a half-price first month.
- About 12%: the card was already cancelled (Blocked) and the old card kept being charged. Switch cards in your grok.com account settings.
- About 2%: wrong expiry date.
- October on its own: charges from xAI on our cards (merchant name GROK XAI — subscriptions and API credits use the same name, so they can’t be told apart) totalled 186, with 116 successful and 70 failed. 69 of the 70 failures were a charge above the card’s balance or limit; 1 was a wrong expiry date.
- Round amounts like $5, $10, $20, $50 and $100 (typical of API credit purchases) made up 61 of those charges, and 29 of them failed — a clearly higher failure share than other amounts. Before buying API credits or turning on auto top-up, make sure the card holds the amount + $1.
If a charge fails, top up first and then retry once — don’t keep clicking. Every charge costs $1, failed ones too (at most 3 failed-charge fees per card per month). Top-ups usually arrive within 5–10 minutes and the card number stays the same.
Check the balance and transactions, or top up this card: Card lookup & top-up
Renewal failed? Read: Grok renewal failed
Still stuck? Contact support
Tell us which step failed and what the page said — a screenshot helps.
