At the end of March this year, I flew from Taichung to Da Nang for two weeks of relaxation.
Before the trip, my biggest concerns were currency exchange + card fees — exchanging USD at a Taiwanese bank, then exchanging to dong at the airport in Vietnam, which took more steps; using a credit card directly incurs a 1.5% overseas transaction fee. A friend suggested I try the Solayer Emerald Card, saying that as long as I deposit some USDC on-chain, I can swipe it like a regular Visa, but with almost 0 fees, and the spending itself can also 'mine for upgrades'.
Day One: Coffee shop surprise
After landing, I dragged my luggage and dove into the roadside Phin Coffee.
While ordering, I was still wondering 'should I go to the ATM to withdraw dong first' — but the shopkeeper directly handed me the POS machine. I took out the Emerald Card, swiped it, and the app immediately popped up a notification: 'A spending of 3.2 USDC has been deducted from the sUSD stable account, today's activity +1.'
The key is that the sUSD account is still earning 4% annualized! That cup of latte is like paying with 'dollars that are earning interest', while the interest is still being calculated.
Day Two: SOL staking surprise
I also transferred my excess SOL into the SOL staking pool, and the app showed 'annualized 12%, credited daily'. In the afternoon, I went to Hoi An to see lanterns, swaying my phone while seeing the staking interest jump into my wallet — it felt like someone was secretly slipping pocket money to me.
Day Three: Identity points egg
It was only on the third day that I understood the clever use of 'on-chain behavior points'. Every time I swipe my card, stake, or transfer money, it gets packaged into 'on-chain identity behavior' by InfiniSVM, accumulating Layer ID weight. During the Solayer community AMA in the evening, the host said that users with high weight in the future can participate in new project airdrops, meaning 'life is a whitelist'.
Why is the experience so smooth? InfiniSVM deserves the credit.
Later, I found out that InfiniSVM can achieve >1,000,000 TPS through hardware acceleration + lightweight protocol reconstruction. No wonder when I swiped my card at the coffee shop in Vietnam, the transaction confirmation was almost 'instant'.
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✈️ Traveler's summary
1. Save on transaction fees: USDC ➜ sUSD ➜ swipe card, saving on currency exchange + overseas card fees.
2. Money is earning interest: 4% sUSD + 12% SOL staking, continuously earning interest while traveling.
3. Identity upgrade: Every purchase and staking accumulates weight, priority for future airdrops.
If you often travel overseas, you might want to try the Solayer Emerald Card.
Leave a comment to tell me: In which scenario do you want to 'swipe on-chain'? The most resonant reply will receive an airdrop of a cup of Vietnamese drip coffee ☕️!
(Don't forget to retweet + tag @Solayer to bring 'on-chain living' into reality 🙌)