THE STABLECOIN WAR Sizing RLUSD Against USDT, USDC, and PYUSD — Part Ten of The Sovereignty Barrier Series September 2026 Abstract Part Five and Part Seven of this series both flagged RLUSD as a genuine threat to XRP's own settlement-layer value proposition—Ripple's stablecoin is doing the institutional work XRP was designed to do. What this series has not yet asked is the harder question underneath that finding: is RLUSD actually winning? This report sizes RLUSD against its real competition—Tether's USDT, Circle's USDC, and PayPal's PYUSD—and finds a more complicated picture than either the bull or bear framing of RLUSD suggests. RLUSD has grown genuinely fast and has climbed into the upper tier of a crowded third rank, but the stablecoin market as a whole remains brutally concentrated: USDT and USDC alone control somewhere between 83 and 89 percent of a roughly $290 to $316 billion total market, depending on the measurement date. RLUSD's entire market capitalization, at its best-reported figure, is smaller than a single percentage point of that combined dominance. The honest finding is double-edged: RLUSD may well be cannibalizing XRP's use case exactly as Part Five argued, while simultaneously being a minor player in the market it is cannibalizing XRP's use case for. 1. Sizing the Battlefield The total stablecoin market stood at approximately $303.2 billion as of July 12, 2026, per DeFiLlama-sourced tracking, having contracted roughly 1.7 percent over the prior 90 days. Other trackers place the figure closer to $287 to $316 billion depending on measurement date and included instruments. This is not a niche corner of crypto: adjusted stablecoin transfer volume reached approximately $9 trillion over the trailing year according to a16z-sourced estimates, meaning stablecoins already function as meaningfully used payment rails rather than purely speculative instruments. 2. The Incumbents: USDT and USDC Tether's USDT holds approximately $184 to $187 billion in market capitalization, roughly 59 percent of total stablecoin supply. Circle's USDC follows at approximately $73 to $75 billion, roughly 24 to 25 percent. Combined, the two control between 83 and 89 percent of the entire stablecoin market depending on the source and date. No other token holds even a 3 percent share. This concentration reflects genuine network effects rather than first-mover advantage alone: deep exchange liquidity, integration across effectively every major trading pair, and entrenchment inside existing DeFi protocols and payment rails create switching costs that later entrants—including RLUSD—have not come close to overcoming. USDT's supply skews toward emerging-market and offshore demand; USDC is the default inside regulated U.S. and European fintech infrastructure specifically, the same institutional segment RLUSD is targeting directly. 3. PYUSD: Distribution Without Dominance PayPal's PYUSD sits at approximately $3.94 billion, ranked around 26th among all cryptocurrencies by market cap. In March 2026, PayPal announced PYUSD's expansion to 70 new international markets, leveraging PayPal's existing global payments distribution rather than building new institutional relationships from scratch. PYUSD is instructive as a comparison case for RLUSD specifically: both are issued by companies with existing enterprise distribution—PayPal's consumer and merchant network; Ripple's cross-border payment relationships—and both remain, despite that distribution advantage, well below the top two incumbents. PYUSD sits below $3 billion despite the brand behind it, illustrating that even a globally recognized consumer brand has not been sufficient to meaningfully dent USDT and USDC's combined dominance. 4. RLUSD: Where It Actually Stands Sourcing on RLUSD's exact market position varies meaningfully across dates and trackers, and this report flags that variance directly rather than picking the most flattering figure. Coverage from mid-2026 places RLUSD's market capitalization at approximately $1.25 to $1.6 billion, ranked around 84th among all cryptocurrencies at one measurement point, described as having overtaken dozens of legacy stablecoins that once defined the market's mid-section, including TUSD, GUSD, and USDD, and positioned as the 12th-largest USD stablecoin globally. Other sources place RLUSD's cross-chain total near $1.3 billion as of January 2026, described at that time as the third-largest U.S.-regulated stablecoin within its first year—a claim that reads as more favorable framing (regulated, first-year cohort) than the unqualified market-cap ranking would support on its own. Reconciling these figures: RLUSD's growth trajectory is genuinely fast for a stablecoin launched in December 2024, and it has meaningfully outpaced most legacy mid-tier stablecoins. But even its most favorable cited figure—low single-digit billions—sits roughly two orders of magnitude below USDT and one and a half orders of magnitude below USDC. RLUSD is not competing with USDT and USDC on anything resembling equal terms; it is competing for position within a crowded third tier that includes Sky Dollar (USDS, ~$8 billion), Ethena's USDe (~$4.5 billion), DAI (~$4.4 billion), and PYUSD (~$3.9 billion)—a tier RLUSD has entered but not yet led. 5. Reconciling With This Series' Honest Ledger Part Five established that RLUSD, not XRP, is capturing the institutional settlement-layer demand this series has consistently argued XRP was designed to serve—ten major 2026 Ripple counterparty deals settled through RLUSD, none through XRP. This report's finding does not contradict that conclusion; it sharpens it in an uncomfortable direction. RLUSD winning share from XRP within Ripple's own ecosystem is not the same claim as RLUSD winning share within the stablecoin market broadly, and the data above shows clearly that it has not done the latter. The honest synthesis: RLUSD has been successful enough, within a narrow enterprise-settlement niche, to redirect demand away from XRP specifically—while remaining a minor participant in the stablecoin category as a whole, still overwhelmingly dominated by USDT and USDC. XRP has, in effect, lost ground to a product that is itself losing the larger competitive battle it is nominally part of. 6. What Would It Take for RLUSD to Break Into the Second Tier? RLUSD's structural advantages over incumbents are regulatory and institutional rather than liquidity-based: Ripple's OCC-conditional national trust bank charter, BNY Mellon custody of reserves, and direct positioning under the GENIUS Act's stablecoin framework give RLUSD a compliance profile some competitors, particularly offshore-weighted USDT, cannot straightforwardly match for U.S. institutional counterparties. Whether that advantage is sufficient to meaningfully close the gap against USDC—which already occupies the “regulated, institutional-default” positioning RLUSD is competing for—depends on variables this series has tracked since Part Four: whether CLARITY Act passage or continued SEC/CFTC rulemaking further formalizes the regulatory advantage RLUSD is counting on, and whether Ripple's expanding banking and prime-brokerage infrastructure (Hidden Road, the pending Federal Reserve master account) converts into stablecoin reserve share rather than merely payment-corridor share. 7. Conclusion — Winning a Narrow War Inside a Larger Loss The stablecoin landscape as it actually exists in mid-2026 complicates any simple narrative about RLUSD. It is real, it is growing, and it has demonstrably redirected institutional demand away from XRP within Ripple's own product ecosystem, exactly as Part Five argued. But it remains a minor player—likely somewhere between the 12th and 84th largest stablecoin depending on measurement date—inside a category so concentrated that its two incumbents alone outweigh every other stablecoin combined by a factor of roughly five to one. XRP has lost relevance to a product that has, itself, not yet meaningfully challenged the market it operates in. Whether that changes the urgency of Part Five's underlying concern is a matter of framing: RLUSD does not need to beat USDT and USDC to keep capturing the specific institutional deals that would otherwise have used XRP—it only needs to keep winning inside Ripple's own ecosystem, which the evidence through mid-2026 shows it is already doing. Ai generated. DYOR. Not financial advice. About Red Rio Ventures Red Rio Ventures, LLC is a Texas-based digital media and research company producing institutional-grade analysis on cryptocurrency, blockchain infrastructure, and digital asset regulation. This report, like the rest of the Sovereignty Barrier Series, is intended for educational purposes only and does not constitute financial, legal, or investment advice. Market capitalization and ranking figures cited are point-in-time estimates that vary by data source and change continuously; readers should verify current figures before relying on them for any decision. © Copyright 2026 Red Rio Ventures, LLC. All rights reserved globally.