KoinlyticsJuly 18 was the statutory deadline for six US federal agencies to publish final rules under the GENIUS Act, the stablecoin framework passed one year ago. The final text confirms the split between payment stablecoins and yield-bearing stablecoins, requires monthly reserve attestations from qualified auditors, and sets custody standards for issuers that want to serve US persons. It is the biggest change to how a US crypto holder should think about their stablecoin allocation since Terra.
What actually changed
The final rules confirm three things that matter for portfolios.
First, payment stablecoins that offer any form of yield to holders lose their payment classification. That means algorithmic yield strategies wrapped inside a stablecoin token, or stablecoins that route trading fees back to holders, cannot be marketed as USD equivalents anymore. Expect several products to restructure or geoblock US users within 90 days.
Second, reserve attestations move from quarterly to monthly. Any issuer without an existing monthly attestation now has a hard clock. Issuers who cannot meet the standard lose access to US bank rails. This is where custody risk becomes practical rather than theoretical.
Third, custody standards for issuer reserves are now explicit. Reserves have to be held in bankruptcy-remote accounts at qualifying institutions. Concentrated exposure to a single bank is capped. Issuers holding reserves offshore lose eligibility for the payment classification entirely.
The portfolio checklist
If you hold stablecoins on a US-facing exchange or wallet, three moves matter this weekend.
- Confirm your stablecoin has monthly attestations published within the last 45 days
- Check whether your yield product is treating the underlying as a payment stablecoin or as a yield-bearing wrapper. If the answer is unclear, treat it as the second and price the risk accordingly
- Concentration audit: no single stablecoin should be more than 60 percent of your stable allocation. This is now regulatory best practice, not just prudence
The tracker angle
Koinlytics already surfaces the stablecoin composition of every tracked wallet by issuer. What we are rolling out next week: a compliance signal on each stablecoin that flags monthly-attestation status, GENIUS Act classification, and concentration risk. It reads like an amber, green or red pill next to each stablecoin position in your portfolio.
The pattern to watch
The signal to watch is which stablecoins geo-fence US users in the next 30 days. That is the tell that an issuer failed the classification, and the flow that follows will move billions between issuers within a week. If you carry meaningful exposure to a stablecoin that goes dark for US persons, you want to know within an hour, not when you go to redeem.