# Can you pay by credit card at DEF CON

You cannot use a credit card for on-site badge purchases or merchandise, both are cash only. A card can be used only for advance online registration. The guide says DEF CON 35 pricing is unannounced, and the 2026 on-site cash price was $520.

Source: https://www.withexpa.ai/conf/2027/def-con
Page: DEF CON 35完全ガイド：日本企業のための参加判断

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Each guide page at https://www.withexpa.ai/conf lists the questions it can answer as complete URLs. Open one exactly as printed; nothing needs to be constructed. `GET https://www.withexpa.ai/llm-query?p=<page>&q=<question>` returns plain text.