Stablecoins, capital controls, and 地下钱庄: how USDT became China's modern underground bank

Four questions that get asked together more often than they get answered together. Can stablecoins be used from inside China? Yes, illegally, at meaningful scale. What about other blockchains? Tron carries most of the Chinese USDT flow; Solana is the growing also-ran; Ethereum L1 is fee-prohibitive for retail. What is 地下钱庄? Chinese underground money houses (dìxià qiánzhuāng; in Japanese, 地下銀行) — a centuries-old informal money-transfer system that exists to work around exactly the kind of capital controls China still imposes. Why does China still have capital controls in 2026? The impossible trinity: a country can't have free capital movement, an actively managed exchange rate, and an independent monetary policy at the same time. China picked the latter two. The persistent gap between official channels and outbound dollar demand is what keeps 地下钱庄 alive — and what USDT-on-Tron now serves at scale.

The short answer: stablecoins are used from China, illegally, at scale

Let's start with the empirical reality before walking through the law and the history.

Despite the PBOC's 2021 ban on individual crypto trading and the SAFE foreign-exchange quota, mainland Chinese individuals use USDT extensively. The dominant venues are Binance P2P (the largest by liquidity), informal OTC desks operating across Shenzhen / Hong Kong / Macau borders, and Telegram or WeChat-based merchant networks. The dominant chain is Tron, where TRC-20 USDT transfer fees are typically below $1 and confirmation times are seconds. A Chinese resident buying a few thousand dollars of USDT for purposes ranging from gaming-asset purchases to capital flight is a normal, common transaction. It is also, in most cases, illegal under mainland law.

The honesty point upfront: this piece doesn't advocate for using USDT to evade Chinese capital controls. It explains why the practice exists, what regulatory and economic structures shape it, and what it means for the broader Asian stablecoin market. The site's commercial focus is US→Philippines retail remittance, which doesn't touch mainland China. China is the elephant in the room of the stablecoin discussion globally and worth understanding on its own terms.

What China's capital controls actually say

China's capital control framework is administered by the State Administration of Foreign Exchange (SAFE), under the People's Bank of China. The headline rules a mainland Chinese resident encounters:

• US$50,000 annual quota per individual for foreign-exchange purchases (the US$50K cap set in 2007 under the personal-FX-purchase facilitation framework that opened in 2006 with the Regulations on Foreign Exchange Administration, periodically tightened in enforcement since). Each purchase requires KYC plus a stated purpose (travel, study, medical, etc.). Multiple individuals pooling their quotas (“螞蟻搬家” / ant-moving) is explicitly forbidden but historically widespread.

• Capital-account restrictions. Outbound investment, real-estate purchases abroad, and most forms of cross-border lending require SAFE pre-approval, are subject to specific quotas, or are simply not permitted for retail investors.

• The September 24, 2021 crypto-trading ban. The PBOC joint notice with nine other agencies declared all crypto-related business activities illegal. Individual holdings are not directly criminalised but exchanges, mining, and crypto-fiat conversion services were ordered to exit. The practical effect was that domestic exchanges shut down or moved offshore; mainland users now access crypto markets via VPN + offshore venues.

• Anti-money-laundering (AML) law. Banks must report suspicious transactions; the Public Security Bureau investigates large or patterned cross-border movements. Foreign-exchange transactions structured to evade the quota are prosecutable under existing AML and 地下钱庄 statutes.

What the rules do not say: the US$50,000 quota is not a hard ceiling on what a Chinese individual holds in foreign currency. Hong Kong bank accounts, Singapore accounts, and accounts held under family members' names have historically been used to accumulate balances above the quota; this is grey, sometimes illegal, sometimes tolerated. The hard rule is on cross-border movement through the official banking channel.

Why capital controls persist in 2026

The structural answer is the impossible trinity (Mundell-Fleming). A country cannot simultaneously have free capital movement, an actively managed exchange rate, and an independent monetary policy. Pick any two. China has, for thirty years, picked exchange-rate management and monetary policy independence; the third — free capital movement — is what gives. Every major emerging market that attempted to combine all three eventually crashed (most famously in the 1997-98 Asian financial crisis); China's read of that history is that capital controls are not a transitional embarrassment but a permanent macro-prudential tool.

The proximate inflection point was 2015-2016. PBOC's August 2015 RMB devaluation triggered the largest single episode of capital flight in Chinese history. Estimates of the outflow vary by methodology but range from US$700 billion to US$1.5 trillion over the following 18 months. Foreign reserves dropped from roughly US$4 trillion to US$3 trillion. SAFE responded by tightening enforcement of the existing quota, slowing the approval pipeline for outbound investment, and intensifying audit of corporate cross-border flows. Controls have not been substantially relaxed since.

The structural reasons capital controls won't relax soon:

• RMB exchange-rate management remains a core PBOC mandate. The managed-float regime, where the RMB trades within a band against a basket of currencies, requires PBOC to intervene in the FX market. Free capital movement would force PBOC to choose between defending the rate and running independent monetary policy — the same choice Britain faced and lost in 1992.

• Real-estate and household-debt fragility. A meaningful share of Chinese household wealth is in domestic property; if households could freely move that wealth out, the RMB depreciation cycle would compound. The 2021-2024 property crisis (Evergrande, Country Garden) made this constraint more binding, not less.

• Geopolitical hedging. US dollar-system sanctions on Russia (2022 onwards) demonstrated what counterparty risk looks like at a sovereign scale. China's RMB-internationalisation push, the digital-yuan project, and mBridge are all responses to that risk. Loosening capital controls works in the opposite direction — increasing exposure to dollar-system shocks. The current direction of travel is more controls, not fewer.

• IMF position is gradualism, not openness. The 2024 IMF Article IV consultation with China affirms that capital flow management measures are an appropriate macro-prudential tool when monetary independence and financial-stability objectives so require. The IMF's historical position on full capital-account liberalisation softened after the 2010s, and now treats capital controls as a normal part of the macro toolkit, not a transitional distortion.

The honest read: capital controls in China in 2026 are not a legacy that will sunset. They are a working feature of the macro regime, retained by deliberate choice. That choice shapes everything downstream — including what 地下钱庄 looks like, and why USDT slots so cleanly into its role.

What is 地下钱庄?

地下钱庄 (dìxià qiánzhuāng, literally “underground money houses”) are informal money-transfer networks operated outside the formal banking system. In Japanese, the same concept is usually written 地下銀行 (chika ginkō, “underground bank”); in English coverage, “underground banking” is the common term. The relationship to South Asian hawala and Middle Eastern hundi is structural, not direct: same economic function (net-settled informal value transfer), different cultural lineage.

The basic mechanic is net settlement. Two operators in two locations — say, Shenzhen and Hong Kong — each hold balances in their respective currencies. When a Shenzhen client wants to send RMB-equivalent value to Hong Kong, they pay RMB to the Shenzhen operator; the Hong Kong operator pays HKD or USD to the recipient out of their local balance. Internally, the two operators run a ledger of who owes whom. No physical money crosses the border. When the ledger imbalance grows too large, the operators settle the difference through their own channels (often parallel structures, sometimes physical movement of cash via couriers, sometimes back-to-back trade invoicing).

This system is centuries old. The Chinese diaspora across Southeast Asia, Hong Kong, and historically the Americas relied on 飛錢 (fēi qián, “flying money”) networks — the same logic — through the 18th and 19th centuries. Today's 地下钱庄 inherit that operational playbook, modernised with mobile banking and (since the 2010s) increasing crypto integration.

Volumes are by nature unobservable. Public-security prosecutions in Guangdong and Shanghai have periodically named individual operations handling hundreds of millions of RMB; researchers who study the system estimate annual aggregate flows in the hundreds of billions of dollars, but these estimates vary widely. The relevant point for this piece is not the exact number; it's that the system has been a persistent, scaled feature of Chinese cross-border finance for decades regardless of which formal-banking-channel reforms PBOC has launched.

Why 地下钱庄 persists in 2026, despite formal banking having opened substantially:

• The SAFE quota is binding for high-income individuals and SMEs who legitimately need to move more than US$50,000 abroad annually. Education for children, real estate purchases, business expansion all routinely exceed the quota.

• The capital-account restrictions are binding for outbound investment, which the formal channel doesn't serve at retail scale.

• Speed and discretion. A 地下钱庄 transfer typically settles in hours; a sanctioned SAFE-approved transfer can take weeks of paperwork.

• The network exists. Operators, ledger conventions, dispute resolution, and reputation systems have decades of institutional memory. New entrants don't need to build infrastructure; they plug into existing rails.

USDT as the modern 地下钱庄

USDT performs the same economic function as 地下钱庄 with different technology. This is the load-bearing observation of the piece.

The mechanic with USDT: a Chinese individual buys USDT on Binance P2P, paying RMB to a counterparty (typically through WeChat Pay or Alipay). The counterparty releases USDT to the buyer's wallet on the Tron network. The buyer now holds USD-equivalent value outside the SAFE quota system, can send it anywhere in the world for cents, and can convert to local currency at the destination via any of dozens of off-ramps (Binance P2P abroad, Coinbase in the US, regulated VASPs in HK / SG / JP).

Map this onto the 地下钱庄 mechanic and the parallel is exact:

• Net settlement: in 地下钱庄, two operators net their bilateral balances; with USDT, the blockchain serves as the universal ledger across all participants. The settlement is “netted” in the sense that no RMB physically crosses any border.

• Off-record relative to SAFE: in 地下钱庄, the operator's books are private and not reported to PBOC. With USDT, the blockchain is public, but the RMB-to-USDT exchange happens off-chain (via P2P fiat rails) and the cross-border USDT movement isn't reported to SAFE.

• Speed and discretion: USDT settles in seconds-to-minutes; 地下钱庄 settled in hours-to-days. Both are dramatically faster than the formal SAFE-approved channel.

• Network-dependent reputation: in 地下钱庄, reputation between operators substituted for legal recourse. On Binance P2P, the platform's rating system and escrow substitute for the same function.

The differences:

• Scale and accessibility: 地下钱庄 was a bilateral-operator network requiring introduction or referral. Binance P2P is a global platform anyone with a phone can access. USDT therefore democratises the underground-banking function in a way 地下钱庄 never did.

• Traceability: 地下钱庄 ledgers were private (paper or local databases) and difficult for authorities to reconstruct after the fact. USDT transactions are public; chain-analysis firms (Chainalysis, TRM Labs, Elliptic) can trace flows. This makes USDT both more legally exposed than 地下钱庄 ever was AND more useful for sophisticated users who understand the trace surface and act accordingly.

• Peg risk and platform risk: 地下钱庄 held RMB and HKD/USD balances directly. USDT introduces counterparty risk against Tether Limited and platform risk against Binance. The 2023 Silicon Valley Bank-driven USDC depeg moment showed those risks are real.

The Chinese authorities have read this exact correspondence, and have been prosecuting USDT-based capital flight under existing 地下钱庄 statutes since at least 2022. Public-security announcements through 2023-2024 named operations in Shanghai, Guangdong, and other provinces with reported volumes in the hundreds of millions to billions of RMB per case; the specific named figures circulating in Reuters / Caixin / Bloomberg coverage at the time should be re-checked against the original announcements before any number is treated as canonical (operator to verify the prosecution-by-prosecution detail against current PBOC / Ministry of Public Security press releases before publication). The legal theory: facilitating cross-border value transfer outside the SAFE quota system is 地下钱庄 activity regardless of whether the rail is paper ledgers or blockchain transactions. Substance over form, in Chinese AML practice.

Why USDT-on-Tron, and the other chains

Tron isn't the largest blockchain by TVL or developer activity, but it carries roughly half of all global USDT supply and an outsized share of Asian P2P stablecoin flow. Four reasons it became the dominant Chinese rail, and where Solana is now substituting:

• Fees and speed. TRC-20 USDT costs $0.50–$2 per transfer for unstaked retail users and effectively near-zero for operators who stake TRX for energy and bandwidth (which is what dedicated P2P merchants and underground-banking operations actually do at scale — the high-volume Chinese flow this piece analyses isn't paying retail per-transfer fees). Settlement is 3 seconds either way. Ethereum L1 costs $5–$30 and settles in 1–5 minutes — economically unworkable for retail P2P amounts. Solana is the only non-Tron rail with comparable economics (sub-$0.01 fees, sub-second settlement) and is the chain that's actually substituting for Tron in 2025-2026, particularly with younger Chinese users; USDT supply on Solana has grown sharply since 2023.

• Installed base since 2018-2019. Tether positioned USDT-on-Tron as the “cheap Asian rail” early and it landed. Binance P2P liquidity and the merchant network are predominantly Tron-based; switching costs for the existing market are real.

• Non-US-aligned chain posture. Tron is structurally less exposed to US enforcement priorities than Ethereum (US-developer-heavy) or Solana (US-VC-backed). For users for whom US-system traceability is a feature to avoid, this matters.

• USDC vs USDT. Chinese flow is overwhelmingly USDT-denominated. Circle's freezability and US-regulatory posture is exactly the opposite of what underground-banking users want; USDT freezes less, lists on more venues, and is the practical default. USDT's reserve controversies are well-known and accepted as a tradeoff.

The chains that don't carry meaningful Chinese P2P flow, briefly: BNB Chain was a major USDT venue in 2021-2022 but has declined post-FTX and post-Binance-CZ settlement; Polygon and the Ethereum L2s (Base, Arbitrum, Optimism) are structurally US-aligned and serve US-institutional / DeFi markets, not Chinese P2P. Plasma (a USDT-centric chain launched in 2025; see the

Tempo vs Plasma piece

) could in principle compete with Tron for Chinese flow but its mainland deployment is limited and the switching cost from established Tron liquidity is high.

Enforcement: prosecuting USDT-based capital flight

Mainland Chinese authorities have escalated enforcement against USDT-based capital flight markedly since 2022. The broad pattern:

• Treating USDT capital flight as 地下钱庄 activity under existing AML statutes. No new crypto-specific law was needed; the AML framework already criminalises facilitation of cross-border value transfer outside the SAFE channel.

• Targeting operators, not retail users. The reported prosecutions overwhelmingly target merchants running P2P operations at scale (RMB 100M+ in moved volume), not individual end-users buying small amounts of USDT for personal purposes. This mirrors the historical posture toward 地下钱庄 — enforcement against operators, not against the depositors using them.

• Chain-analysis cooperation. Chinese authorities have built domestic chain-analysis capacity and (per Reuters reporting) reportedly cooperate selectively with international chain-analysis firms for larger cases. Tron transactions are traceable like any blockchain transactions; the meaningful question is whether authorities can link an on-chain address to a real-world identity, which the AML-compliance pathway through Binance and similar venues makes easier than naive crypto narratives suggest.

• Hong Kong cooperation pathway. Hong Kong's AMLO Amendment Ordinance (effective 2023) brought VASPs under the SFC licensing regime; subsequent rule-making and press coverage suggest expanded information-sharing with mainland authorities for suspicious-transaction reporting, though the specific 2024 amendments and their information-sharing language should be verified against the SFC and the Hong Kong gazette before any specific compliance claim is treated as canonical (operator to confirm). The directional effect is clear: a Chinese user who on-ramps RMB into USDT via a Hong Kong venue is more traceable in 2026 than the same user would have been in 2022.

The realistic read: USDT-based capital flight from China is materially easier than the formal SAFE channel for moderate volumes, but is not legally safe. Individual users transacting small amounts face limited enforcement risk; operators running networks face significant prosecution risk and have been prosecuted at scale. The risk-reward calculation has been getting worse for operators since 2022, even as the underlying retail demand remains strong.

The Hong Kong escape valve

Hong Kong functions as China's regulated stablecoin sandbox, and the contrast with mainland prohibition is deliberate. The Hong Kong Monetary Authority's August 2025 stablecoin regulation created a licensing regime for HKD-pegged and other stablecoins. Sandbox participants include JD Coinlink (a JD.com subsidiary), Standard Chartered, and others; HKMA has been deliberate about admitting credible institutional issuers.

The pattern is now legible: mainland China bans private stablecoins domestically and issues e-CNY (the digital yuan) as the state-controlled digital-money product; Hong Kong regulates private stablecoins and lets them operate under license. This is “one country, two systems” applied to digital money. For Beijing, Hong Kong serves as both a hedging zone (if private stablecoins win globally, China has a domestic-jurisdiction outpost) and an experimental zone (let HK try things and observe before deciding whether to fold any of it back into mainland policy).

What Hong Kong's regime is not: an authorised on-ramp for mainland Chinese capital flight. The HKMA licensing requires the same SAFE-equivalent screening of mainland-resident customers that would apply to traditional banking. A mainland Chinese individual who wanted to on-ramp RMB into a licensed HKD stablecoin through a HKMA sandbox participant would face the same know-your-source-of-funds process as a regular HKD bank account opening. The licensed-stablecoin pathway is not an evasion route.

The broader mBridge-vs-Project-Nexus dynamic — covered in our companion piece on

the digital yuan and the public-sector CBDC story

— sits alongside this one. The key China-side fact: BIS withdrew from mBridge in October 2024, so the multi-CBDC mBridge platform — including e-CNY alongside e-HKD, the Thai baht CBDC, the UAE dirham CBDC, and the Saudi riyal CBDC — is now operated by the five participating central banks rather than under BIS hosting. The platform is not “the international leg of e-CNY” in any narrow sense; Carstens specifically pushed back against the BRICS-bridge / sanctions-evasion framings at the time of BIS withdrawal, and the multi-CBDC architecture is what makes that disclaimer defensible. None of this changes the practical mainland-resident reality of choosing between SAFE quota, 地下钱庄, or USDT for outbound value transfer.

What this means for the US→Philippines corridor

Almost nothing, directly. The site's commercial focus is US-based senders moving money to Philippine recipients, and that corridor doesn't touch mainland China at any layer. A US sender uses Coinbase (US-regulated, no SAFE issues) on the on-ramp; a Filipino recipient uses Coins.ph (BSP-licensed) on the off-ramp. China is not in the route.

What this piece offers for a US→PH-focused reader is editorial context. The reasons USDT (and not USDC) is the dominant Asian P2P stablecoin lie in this kind of analysis — USDT's structural fit for capital-control-evading uses, its Tron-anchored fee structure, and the broader Asian informal-finance traditions it has slotted into. When the site covers the Philippines side of the corridor — where USDT is the dominant on-chain dollar among retail crypto users, despite Coins.ph supporting USDC equally — the upstream demand structure that makes USDT dominant is the Chinese story this piece walks through.

For sender-side practical purposes: a US individual sending money to family in the Philippines should use USDC via the route the

anchor walkthrough

covers. USDT-on-Tron exists in the same broad ecosystem but is operationally less smooth from the US side (Coinbase doesn't list USDT for US users; Kraken does; Cash-App-Bitcoin substitution is the practical alternative for users outside Coinbase's onboarding). The honest answer is that this piece's Chinese-side dynamics explain why USDT exists in the form it does, but a US sender doesn't typically interact with that side.

Bottom line

Four answers to the four questions:

• Can stablecoins be used from China? Yes, illegally, at meaningful scale, predominantly USDT-on-Tron via Binance P2P.

• What about other blockchains? Tron carries the bulk of Chinese USDT flow. Solana is the growing substitution. Ethereum L1 is fee-prohibitive. BSC is declining. USDC has limited Chinese flow because freezability and US-regulatory exposure are the opposite of what users-of-the-rail want.

• What is 地下钱庄? Centuries-old Chinese underground money-transfer system, net-settled, off formal-banking-channel books. The economic function — moving value around capital controls — is the same one USDT now serves at retail scale.

• Why does China still have capital controls? Impossible trinity. China prioritises exchange-rate management and independent monetary policy; free capital movement is what gives. The 2015-2016 capital flight episode reinforced this choice. Controls are a working feature of the macro regime in 2026, not a legacy awaiting reform.

The synthesis the four questions point at: USDT is the digital reinvention of 地下钱庄. Same economic function, different technology, same regulatory cat-and-mouse with SAFE and PBOC. The Chinese state recognises the parallel and is prosecuting accordingly. The persistence of capital controls and the persistence of USDT in Chinese flows are two sides of the same equilibrium.

Primary sources checked

Every empirical claim can be verified against a primary source. Specific dollar figures (the US$50,000 quota, the 2015-2016 outflow estimates, the USDT volume figures) move and should be re-checked against current SAFE publications or Reuters/Caixin reporting. The analytical frame — impossible trinity, the 地下钱庄/USDT parallel, the enforcement pattern — is the editorial contribution.

• SAFE capital control framework: State Administration of Foreign Exchange, Annual Report on Cross-Border Capital Flows, and the periodic notices on the foreign-exchange-purchase facilitation quota.

• September 24, 2021 crypto ban: PBOC joint notice with nine other agencies, “Notice on Further Preventing and Disposing of Speculation Risks in Virtual Currency Trading.”

• IMF Article IV consultation with China (2024): the IMF's annual surveillance review, including its position on Chinese capital-flow management measures.

• 2015-2016 capital flight estimates: IMF External Sector Reports, BIS quarterly reviews, and Bloomberg / Reuters reporting from the period.

• USDT volume on Tron: Tether's public attestations report Tron-based supply; DefiLlama and CryptoQuant publish independent verifications. Chainalysis “Geography of Cryptocurrency” annual reports include China-specific flow estimates with appropriate caveats.

• 地下钱庄 prosecutions: People's Bank of China and Ministry of Public Security press releases on specific cases; Reuters / Caixin / Bloomberg coverage of named Shanghai and Guangdong operations through 2023-2024. Specific volume figures vary across coverage and should be re-verified against the original announcements before relying on them.

• Hong Kong stablecoin regulation: HKMA “Discussion Paper on Crypto-Assets and Stablecoins” (January 2022 onwards), the August 2025 Stablecoin Bill, and the licensing-regime announcements.

• mBridge BIS withdrawal: BIS press release (October 31, 2024); Agustín Carstens spoke publicly about the withdrawal at multiple Hong Kong venues in late 2024 (operator to confirm the specific event citation against BIS speech archive before treating any one venue as canonical). Covered in detail in the

  China e-CNY 2026 piece

  referenced above.

Companion pieces:

Tether's shadow-dollar-bank strategy

(why USDT exists in the form it does globally),

What is a stablecoin? Five categories

(the legal-category framework the piece uses for Categories 1 and 5), and

The four cross-border payment rails

(where mBridge and Nexus fit alongside stablecoins).

This piece is editorial framing, not legal, tax, or investment advice. Using USDT to evade Chinese capital controls is illegal under mainland law; using stablecoins generally carries tax, sanctions, and platform-compliance obligations in any jurisdiction. The piece exists to explain the structural dynamics of the Chinese market, not to recommend any course of action to any individual reader.