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Frits Zwager

Building safety checks for AI agents that pay. x402 Doctor checks 50,000 paid APIs every day; presign-guard checks transactions before an agent signs.

Amsterdam Joined on Oct 17, 2026 https://fizzl.eu/

Work

Founder, Fizzl

Oct 18

The seven most common x402 seller mistakes, and how to fix them

#x402 #webdev #api #ai

6 min read

Oct 17

We check 50,000 paid x402 endpoints every day. Here's what works and what breaks.

#x402 #ai #api #webdev

5 min read

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