API & DevAnswered

Why does Claude API payment keep failing?

Anonymous7/9/2026· Views 157

I'm trying to set up a payment method to use the API for a personal project, but my card keeps getting declined. It's a Visa card that supports international payments too. Is it possible that certain card issuers or card types don't work? Or maybe it blocks you if you have a VPN on? I'm not sure exactly where the issue is. If anyone has experienced the same problem, please share how you resolved it.

Answers 1

You need to log in to write an answer.

첫째StaffLv.67/9/2026

Hello, this is an admin update. To get straight to the point: even with a Visa card, payment can be declined if multiple conditions are not met simultaneously, and VPN usage is certainly a possible culprit. According to Anthropic's official support center, there are four main reasons why card declines occur. 1. Billing address mismatch. If the billing address you enter on the payment page differs from the address registered with your card issuer in any way, the payment will be declined. Even minor differences like typos in the street name or a missing zip code can cause rejection. 2. Unsupported country or region. Anthropic has a specific list of supported countries for payments. While Korea is currently on this list, if your card was issued in a country not on the supported list, it will be blocked. 3. 3D Secure (3DS) authentication not completed. Some cards require a verification step during payment, such as bank app approval or OTP entry. If you don't complete this authentication, payment will be declined. There have also been reports where payment fails mid-process even if your bank has already approved the transaction. 4. VPN usage during payment. Anthropic's payments are processed through Stripe, which cross-references the card BIN (issuing country code) with your connection IP location. If VPN is enabled, the mismatch between your IP location and card issuer country may be flagged as a suspicious transaction and blocked. If you have a VPN enabled, try disabling it first. Here's a practical troubleshooting checklist. 1. Completely close any VPN or proxy and try again. 2. Make sure the billing address you enter on the payment page exactly matches the address registered with your card issuer. 3. If a 3DS authentication window appears, complete it to the end. 4. Repeated attempts after failure may trigger additional automatic blocking by your card issuer, so it's recommended to identify the cause and wait between attempts. 5. If you've confirmed all the above and it still doesn't work, contacting support.anthropic.com directly will be faster. Detailed solutions for payment errors organized by cause are available in our guide below. https://usingclaude.com/ko/api/start/claude-api-payment-failed-fix