# Stablecoins

Canonical URL: https://menfem.com/kb/crypto/concepts/stablecoins
Knowledge base topic: [Crypto & Digital Assets](https://menfem.com/kb/crypto)
Frontier status: breakthrough
Tags: payments, regulation, settlement

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Stablecoins are digital tokens pegged to a reference currency (overwhelmingly USD) that function as the native unit of account and payment rail for the digital-asset economy. USD stablecoin supply grew to roughly **$280–300B by year-end 2025** from ~$25B in 2020 — making stablecoins the single largest bridge between crypto rails and the dollar-denominated financial system. The GENIUS Act (enacted July 2025) established the first federal framework, but four implementation questions remain open — interest payments, monetary unity (singleness of money), illicit-finance prevention, and operational resilience — and will determine whether stablecoins become trusted payment instruments or stay confined to crypto trading.

The stablecoin market is structurally a duopoly. **Tether (USDT)** holds 65.6% share at ~$184B in supply — it dominates cross-border payment flows, emerging-market dollar access, and offshore crypto trading. **Circle (USDC)** holds 26.3% share at ~$60B, growing 73% year-over-year versus USDT's 36%, with a mandate to own the institutional and regulated segment. The GENIUS Act has defined stablecoins as two-tiered regulated instruments — the legislation will force every US-market issuer to be either a bank or a licensed payment stablecoin issuer with segregated reserves and third-party audits. **Effective-date note:** the Act's own text sets the deadline as the earlier of 18 months after enactment (= January 18, 2027) or 120 days after regulators finalize rules; a Morgan Lewis April 2026 status check (full-text verified 2026-07-22) states the "effective date: January 18, 2027" explicitly and reports that rulemaking was still incomplete across Treasury/FDIC/NCUA/OCC as of April 2026 — the KB's previously-recorded "November 2026" figure appears to assume regulators would finish early enough to trigger the 120-day alternative; both dates are legitimate readings of the same clause depending on when final regs land, so treat the effective date as **January 2027 at the latest, possibly November 2026 if rulemaking finishes by ~July 2026** — not a settled single date. This is the most consequential regulatory moment for the sector since its creation.

The commercial model for fiat-backed stablecoins is straightforward: issuers hold customer dollars in short-term US Treasuries and money-market instruments, earning interest on the float while paying zero yield to stablecoin holders. At current rates, Tether generates substantial interest income on its $184B of reserve assets — making it one of the most profitable financial entities per employee globally. Circle's unit economics are complicated by a revenue-sharing agreement with Coinbase: Circle's 2024 prospectus disclosed $1.7B in revenue against just $167M operating income, with distribution costs exceeding $1B flowing predominantly to Coinbase.

## Key Claims

- **GENIUS Act signed July 18, 2025** — House passed July 17, 2025 (308-122); Senate 68-30. Creates a federal licensing regime for "payment stablecoins." *Evidence: strong* ([Morgan Lewis](../../raw/genius-act-stablecoin-law-2025.md))
- **1:1 reserve requirement, segregated accounts, monthly public reporting** — All outstanding stablecoins must be backed by US dollars, demand deposits, or short-term Treasury obligations held in segregated accounts subject to regular third-party audits; rehypothecation and holder-interest payments are prohibited. *Evidence: strong* ([Morgan Lewis](../../raw/genius-act-stablecoin-law-2025.md))
- **Effective date: January 18, 2027 (per Apr 2026 Morgan Lewis status check)** — the earlier-of-18-months-or-120-days-post-final-rules clause; rulemaking across Treasury/FDIC/NCUA/OCC was still incomplete as of April 2026. Foreign issuers can serve the US market if Treasury certifies their home regime is "comparable." *Evidence: strong, but see effective-date caveat above* ([Morgan Lewis implementation status](../../raw/genius-act-implementation-2026.md))
- **USDC supply ~$60B, growing 73% YoY** — Circle NYSE IPO (CRCL) closed 2025. *Evidence: moderate* ([Ledger Insights](../../raw/circle-ipo-usdc-supply-2026.md))
- **Circle 2024 financials: $1.7B revenue, $167M operating income** — distribution costs >$1B (predominantly to Coinbase) are "the massive dent" in profitability per the prospectus analysis; a late-2024 Binance deal carried a $74.1M upfront fee; Circle acquired Hashnote (tokenized money-market fund issuer). *Evidence: moderate (pre-IPO prospectus analysis; article itself flags as partly paywalled)* ([Ledger Insights](../../raw/circle-ipo-usdc-supply-2026.md))
- **USDT supply ~$184B, 65.6% market share** — Tether remains private, opaque, Cayman-domiciled. *Evidence: moderate* (multiple sources)
- **PayPal PYUSD and Stripe/Bridge entering** — PYUSD is a third-tier issuer; Stripe acquired Bridge for stablecoin payment rails. *Evidence: moderate* (multiple sources)
- **USD stablecoin supply ~$280B at year-end 2025**, up from ~$25B in 2020 — an ~11x increase in five years. *Evidence: moderate* ([Brookings — Liang & Dudley](../../raw/genius-act-stablecoin-next-steps.md))
- **Treasury Secretary Bessent projected stablecoins could reach $3 trillion by 2030.** *Evidence: weak (official projection)* ([Brookings](../../raw/genius-act-stablecoin-next-steps.md))
- **Four unresolved GENIUS implementation issues** — interest payments, singleness/par of money, illicit-finance (BSA/AML), and operational resilience — frame the open regulatory agenda. *Evidence: moderate* ([Brookings](../../raw/genius-act-stablecoin-next-steps.md))
- **Permissible reserve assets under GENIUS:** US coin/currency, T-bills ≤93 days, uninsured bank deposits, and repo; issuers subject to the Bank Secrecy Act, with FinCEN to issue rules within 3 years. *Evidence: moderate* ([Brookings](../../raw/genius-act-stablecoin-next-steps.md))
- **OCC conditionally granted national trust bank charters to Circle, Paxos + 3 others (Dec 2025)** — an early signal of which issuers can operate federally. *Evidence: moderate* ([Brookings](../../raw/genius-act-stablecoin-next-steps.md))
- **Enterprise adoption is early but inflecting:** an EY survey found only **13%** of firms currently use stablecoins, but **>50% of non-users** expect to adopt within 6–12 months; EY estimates stablecoins could be **5–10% of cross-border payments by 2030 ($2.1–4.2T)**. *Evidence: weak (single survey)* ([Brookings](../../raw/genius-act-stablecoin-next-steps.md))
- **Total supply just under $300B; Tether 63% / ~$185B USDT; Ethena USDe >$14B (~3%)** — adjusted stablecoin transaction volume reached **$11.8T, +89% YoY** in 2025. *Evidence: moderate* ([The Block — Institutional Outlook](../../raw/institutional-crypto-outlook-2026.md))
- **~$300B stablecoin market cap across ~300M holder wallets**, tracked alongside ~100 distinct stablecoins. *Evidence: moderate* ([RWA.xyz](../../raw/rwa-tokenization-2026-state.md))

## Benchmarks & Data

- Total stablecoin market cap: ~$280–300B (year-end 2025 / 2026)
- USD stablecoin supply growth: ~$25B (2020) → ~$280B (end-2025)
- USDT: ~$184–185B (63–66% share)
- USDC: ~$60B (26.3% share, 73% YoY growth)
- Ethena USDe: >$14B (~3% share)
- Adjusted stablecoin tx volume: $11.8T (2025, +89% YoY)
- Stablecoin holder wallets: ~300M
- GENIUS Act prohibition effective: January 18, 2027 (backstop date; could be as early as ~Nov 2026 if regulators finish rulemaking sooner — see caveat)
- Circle 2024 revenue: $1.7B; operating income: $167M; distribution costs >$1B (mostly to Coinbase)
- Bessent projection: $3T by 2030

## Open Questions

- Will Tether obtain a GENIUS Act license or restructure for non-US issuance only?
- How will PYUSD and Stripe/Bridge compete once the GENIUS Act licensing regime is live?
- What does the reserve-audit requirement reveal about Tether's actual asset composition?
- Will yield-bearing stablecoins (paying interest to holders) be permitted under GENIUS Act? (Brookings flags interest payments as the first of four unresolved issues.)
- Can the system preserve "singleness of money" (par convertibility across issuers) once multiple licensed stablecoins circulate?

## Related Concepts

- [On-Chain Settlement](./on-chain-settlement.md) — Stablecoins are the primary unit used for on-chain settlement in institutional contexts
- [Tokenization / RWA](./tokenization-rwa.md) — Stablecoin reserve assets (Treasuries) are the same asset class being tokenized in the RWA market

## Changelog
- **2026-06-15** — Initial compilation from 3 sources (GENIUS Act legislation, Circle IPO analysis, Morgan Lewis implementation)
- 2026-06-24 — Compiled new sources (genius-act-stablecoin-next-steps, rwa-tokenization-2026-state, institutional-crypto-outlook-2026)
- **2026-07-22** — Full-text fetch of genius-act-stablecoin-law-2025, genius-act-implementation-2026, circle-ipo-usdc-supply-2026 completed. Flagged an effective-date discrepancy (Nov 2026 vs the Jan 18, 2027 backstop date the Act's text actually specifies); added Circle's 2024 revenue/profitability detail from its pre-IPO prospectus

## Sources

- genius-act-stablecoin-law-2025
- genius-act-implementation-2026
- circle-ipo-usdc-supply-2026
- genius-act-stablecoin-next-steps
- rwa-tokenization-2026-state
- institutional-crypto-outlook-2026

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Cite as: MenFem Knowledge Base — https://menfem.com/kb/crypto/concepts/stablecoins