AI assistants most often recommend PayPay for payment gateways in 🇯🇵 Japan (日本語), naming it in 100% of the buyer questions we tested, followed by Amazon Pay and LINE Pay. We asked an AI model the questions buyers ask about payment gateways and tallied which brands it named most — "share of voice" in AI answers, who AI recommends when no human is watching.
| # | Brand | AI share of voice |
|---|---|---|
| 1 | PayPay | 6/6 (100%) |
| 2 | Amazon Pay | 6/6 (100%) |
| 3 | LINE Pay | 5/6 (83%) |
| 4 | 楽天ペイ | 4/6 (67%) |
| 5 | Mercari Pay | 2/6 (33%) |
| 6 | PayPal | 2/6 (33%) |
| 7 | Stripe | 2/6 (33%) |
| 8 | Mercari | 1/6 (17%) |
| 9 | Rakuten Pay | 1/6 (17%) |
Method: 6 representative buyer questions via a large language model, 🇯🇵 Japan (日本語). Updated 10/18/2026. A proxy for how AI assistants describe this category.
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