# The Missing Payment Stack

By [Amhed](https://paragraph.com/@osito) · 2025-06-23

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_Turning Stablecoins into the Default Checkout Button Across LATAM._

Stroll by any city where in-real-life crypto payments are being attempted right now. You’ll spot three or four QR stickers competing for attention: a local bank app, a regional fintech, and—if the owner has a crypto-savvy nephew—a laminated “Pay with USDC” sign no one quite understands yet.

**Cards still skim 1.5 – 3.5 % and pay two days late. Stablecoins clear in seconds for pennies—so why is the Verifone still king?**

Because wallets and POS terminals speak different dialects and shoppers show up empty-handed.

### Stablecoins already solve half the puzzle

Merchants care about two numbers:

1.  **Fee percentage** – Card processing still averages **1.5 – 3.5 %** per swipe in most markets
    
2.  **Settlement delay** – T + 2 days (or longer) for pesos to hit the bank.
    

A USDC transfer on an L2 clears in seconds for a fraction of a cent. It’s no wonder 71 % of Latin-American firms [already use stablecoins for cross-border payments](https://www.fireblocks.com/report/state-of-stablecoins/).

So why isn’t every coffee shop ditching cards tomorrow? Two words: **cold start**.

### The cold-start trap: no funds, no flow

To pay in USDC/USDT, customers first need:

1.  **A wallet** they actually understand.
    
2.  **Liquidity**—stablecoins loaded and ready to spend.
    

No wallet is yet built for the checkout line. Consumers that have installed crypto wallet have either:

*   **A General-Purpose wallet** (CB Wallet, Phantom, Metamask). These are multi-chain, asset-rich, great for Defi, but utterly confusing for the general public.
    
*   **A Payments-first wallet** (Decaf, Sling, ugly cash,…). Great exposure to stablecoins, and maybe a debit card, but still no way to interact with a POS.
    

### The stack, layer by layer

We need to build more than “just a better wallet”. We need a tightly integrated, opinionated (but based on open standards) whole stack so that the payments process is delightful instead of clunky.

**On/Off-Ramp Rails**. Users need options to move money inside and outside of the wallet without feeling trapped or going through 20 screens for KYC. [ZAR](https://www.zar.app/) is a great example of solving this problem.

**Wallet UX**. Account-Abstracted, Face ID, onchain-FX to switch between dollars and pesos.

**Payment-Request Standard**. Wallet <> POS handshake. Either QR or NFC-based spec to transmit amount, asset, network. [x402](https://www.coinbase.com/developer-platform/discover/launches/x402) and [eip-7856](https://eips.ethereum.org/EIPS/eip-7856) come to mind as possible building blocks.

**Auto-bridging.** Regardless of what assets the wallet or the POS expects, bridging digital dollars should be configurable, effortless, and instant. [Daimo Pay](https://pay.daimo.com/) has done a great job at simplifying this for online commerce.

**Settlement Signaling.** QRs are not enough. We need instant notifications between both the paying wallet and the POS to let the participants know that the transaction settled successfully.

**Merchant Tools.** SMBs might be ok with a simpler POS, but larger retailers need better tooling: offramping workflows, tax reporting, POS management for stores with multiple cash registers, refund flows, treasury management, etc.

### The ideal checkout experience

1.  Complete your order at the register.
    
2.  The cashier inputs the amount to charge, similar to a verifon/ingenico device.
    
3.  The POS shows a QR or NFC signal
    
4.  The buyer taps or scans the QR
    
5.  The wallets shows:
    
    1.  The amount in USDC or Pesos
        
    2.  An option to leave a tip
        
    3.  A confirm button
        

At this point there's no notion of networks or assets, just digital dollars.

1.  Depending on the expected currency on the POS the wallet performs a just-in-time, fx-enabled, intent bridge, or a simple onchain transfer.
    
2.  Both participants receive confirmation as soon as the transaction settles on the blockchain:
    
    1.  Merchant’s POS shows “$22.50 settled”
        
    2.  The Buyer's wallet shows a receipt of the amount paid, and the name of the merchant. Similar to [ETH Receipts](https://ethreceipts.org/l/8453/12320223/94)
        
3.  The customer walks out with their order
    

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Crypto payments won’t win because they’re futuristic; they’ll win because they’re **cheaper, faster, and invisible**. Solve the cold-start problem, and the word “crypto” quietly drops out of the conversation.

We're building this for LATAM. If you're looking for an early engineering team to join, drop us a line _amhed\[at\]paymentstack\[dot\]io_

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*Originally published on [Amhed](https://paragraph.com/@osito/the-missing-payment-stack)*