There is a specific, concrete friction in Thai secondhand buying that almost nobody writes about, and it disadvantages Western buyers relative to Asian ones.

Cash still rules

At market and warehouse level, cash in baht dominates. The kilo-shop chains are largely cash-only. Rong Kluea is cash-only. Khlong Thom is cash-only and wants small notes. Almost nothing outside a mall takes a foreign card.

If you are buying seriously you will be carrying more physical money than feels comfortable. Plan for it: split it, don't flash it, and arrange your transport before you turn up somewhere with a full wallet and an empty bag.

The PromptPay problem

Every Thai person pays by scanning a PromptPay QR code. It is instant, it is free under ฿5,000, and every vendor has one taped to the counter.

You cannot use it. PromptPay registration requires a Thai bank account and a Thai phone number, which as a visitor you do not have.

Who can pay by QR and who cannot

Thailand has cross-border QR links that let visitors pay from their home banking apps. Those links cover:

  • Japan, South Korea, China, Hong Kong, Singapore, Malaysia, Vietnam, Cambodia, Indonesia, Laos

They do not cover the United States, United Kingdom, European Union or Australia.

So a Japanese buyer standing at the same warehouse counter as an American buyer pays instantly from their phone, while the American is counting out ฿20,000 in notes. That is not a trivial difference when you are negotiating — it changes how you are perceived and how fast a transaction closes.

The workarounds that actually work

TAGTHAi Easy Pay. Top up with cash at a Kasikorn FX booth and pay by QR. The most practical option for a visiting buyer.

True Wallet. Top up at any 7-Eleven, maximum ฿3,000 per transaction. Fine for food and taxis, too limited for stock.

Wise has been rolling out PromptPay scanning through 2026. Check the current state before you travel — if it works for your account it is the cleanest solution available.

A Thai partner. If you are working with a fixer, agent or Thai-speaking friend, they can pay by QR and you settle with them. This is what most repeat buyers end up doing.

Fees, for reference

Thai QR transfers are free under ฿5,000, then ฿2, ฿5 or ฿10 by tier. Cash withdrawal from a Thai ATM with a foreign card costs ฿220 per transaction plus your own bank's charges, which makes large single withdrawals meaningfully cheaper than several small ones.

The negotiating angle

Cash is not only a constraint, it is leverage. At a warehouse, being able to say a number and put the notes on the counter closes a deal faster than any amount of discussion. Bring it in useful denominations, keep it separated, and decide your ceiling before you start talking.