Your payment processor holds your money. We don't. Non-custodial stablecoin payments straight to your wallet.
Joined April 2026
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Interchange on a $100 card transaction: about $2.40.
Interchange on a $100 stablecoin transaction: $0.00.
The rest of the card fee is markup, reserve, and float.
The buyer never buys ETH, POL or BNB.
Network gas is paid in the stablecoin itself, through an ERC-20 paymaster. A first-time stablecoin user pays in USDC, signs once, done.
No native token to buy before the first payment.
pymstr.com
The next $1B custodial hack won't be a DeFi exploit.
It will be a payment processor holding customer funds it never needed to hold.
CoinsPaid was the rehearsal. Alphapo was the warm-up. Bybit was the intermission.
Cantor Fitzgerald manages Tether's reserves.
A Wall Street primary dealer backs the largest stablecoin on earth.
TradFi isn't circling the category. It's already inside it.
If your webhook endpoint accepts unsigned POSTs, someone can forge payment confirmations. (thread) ↓
6/ Merchant side: recompute the HMAC on the raw body BEFORE parsing JSON. A middleware rewrite otherwise breaks the check.
7/ One idempotent handler plus one signature check equals unspoofable. pymstr.com
Your compliance team is fighting the 2020 war.
Back then "crypto" meant unregistered exchanges and mixers.
Today it means MiCA-licensed issuers, tokenized deposits, and JPMorgan on-chain. The threat model expired.
Signup to first accepted payment on PYMSTR: 5 minutes.
Traditional high-risk processor onboarding: 2 to 8 weeks of underwriting.
Same-day acceptance vs weeks of paperwork.
Card processors are running a covered call on your settlement timing.
They hold your money. They earn the float. You bear the reversal risk.
Priced correctly, that option would cost 4-6%. You pay for it in the "processing fee".
Ethena's USDe: $6B TVL.
A synthetic dollar hedged with crypto derivatives.
The stablecoin category isn't one thing anymore.