[msquared]

Buyer spends 1 BTC @ $800 USD/BTC. Value of BTC goes down to $400 USD/BTC. Seller left with 1 BTC worth $400 (if they don't cash out). Buyer requests refund of value @ $800. Seller has 1 BTC @ $400.

I guess this would be mitigated by immediate exchanges... Haven't used Coinbase enough to know how well this would work, specifically their merchant services, but what's the per-transaction cost to immediately exchange BTC on transactions? Also, I've seen buy/sell prices on CB - is that the same in their merchant accounts? I see daily cashouts as a merchant option, but that doesn't entirely remove the fear of a market crash. Or even smaller daily variations (morning price high, evening price low, etc).

I could see how there would be at least some potential for long-term concern.

[ry0ohki]

If you are a US citizen and purchase something from a British site in pounds, you wouldn't expect a refund in dollars would you? You assume the risk of currency fluctuation and fees.

[GigabyteCoin]

That's not how coinbase (the company app.net is working with) works, though.

The second somebody makes a payment via BTC through coinbase for an app.net project, the BTC is cashed out on the fastest exchange possible and the fiat value of that BTC directly sent to app.net whenever they please.

[gnaritas]

> Buyer spends 1 BTC @ $800 USD/BTC. Value of BTC goes down to $400 USD/BTC. Seller left with 1 BTC worth $400

No, seller never sees BTC, buyers BTC are immediately turned into USD and seller gets USD. No fear of market crash, they're getting the instant exchange rate.