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Tung@fizen

Dev at Fizen. I write practical guides on paying for Cursor, Copilot, Vercel & any SaaS with USDT — no bank, no more declined cards. Self-custody crypto card, no middleman.

Hong Kong Joined on Jun 30, 2026 https://blog.fizen.io

Work

Dev at fizen.io

Tung@fizen

Jul 22

How much FX markup are you paying on your USD subscriptions? Probably more than you think

#payments #productivity #webdev #finance

2 min read

Tung@fizen

Jul 17

A field guide to Stripe decline codes, and what to actually do about each

#payments #webdev #stripe #productivity

2 min read

Tung@fizen

Jul 13

You got into Kiro, SuperGrok or Manus. Now the payment will not go through

#ai #payments #tools #webdev

2 min read

Tung@fizen

Jul 8

I give every SaaS subscription its own disposable card. Here is why

#security #payments #productivity #webdev

2 min read

Tung@fizen

Jul 4

ChatGPT Plus and Claude Pro reject your card? It is probably the billing country, not the card

#ai #payments #productivity #webdev

2 min read

Tung@fizen

Jun 30

Your card keeps getting declined by US dev tools. Here is what is actually happening

#webdev #payments #saas #productivity

2 min read

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