Pix

Pix Censorship in China and North Korea: Technical Methods and Workarounds

What Pix is

Pix is a real-time payment system launched by the Central Bank of Brazil (Banco Central do Brasil) on November 16, 2020. It enables instant money transfers between individuals and businesses using only a phone number, email, or tax ID as an identifier. By 2023, Pix had become Brazil's dominant payment method, with over 150 million registered users and processing billions of transactions monthly. The system is operated by the Central Bank itself, with participating banks and payment service providers acting as intermediaries. Unlike traditional international remittance networks, Pix operates primarily within Brazil's domestic financial ecosystem, though its API and growing international integration have attracted attention beyond Brazilian borders.

Why it's censored

In China, Pix faces restrictions rooted in the government's control over cross-border financial flows and data governance. The People's Bank of China (PBOC) enforces strict capital controls under the Foreign Exchange Administration Regulations. Chinese regulators view foreign payment systems as potential vectors for unauthorized outbound money transfers and circumvention of capital account restrictions, which carry penalties under Article 120 of China's Foreign Exchange Law. The system's real-time, decentralized nature—requiring minimal intermediary friction—makes it particularly problematic for authorities seeking to monitor and restrict capital flight.

In North Korea, censorship reflects absolute control over all external financial transactions. The regime prohibits private access to foreign payment systems as part of its comprehensive isolation policy and sanctions compliance strategy. The Workers' Party of Korea maintains a monopoly on all foreign currency transactions. Any foreign payment system, including Pix, represents an uncontrolled financial channel outside regime oversight.

Technical blocking methods

China employs layered blocking strategies. The primary method is DNS filtering: requests to Pix domain infrastructure and affiliated banking partner domains are intercepted by China's DNS resolver system, returning null responses or spoofed IP addresses. Secondary IP-based blocking occurs at the gateway level, where known server addresses hosting Pix APIs are blacklisted. For users attempting HTTPS connections, Deep Packet Inspection (DPI) can identify SNI (Server Name Indication) handshakes containing Pix-related domains and reset connections before encryption completes. This prevents even users with alternative DNS resolvers from establishing encrypted sessions.

North Korea's blocking is less technically sophisticated but more absolute. The country maintains a closed intranet model where international connections are restricted to state-approved channels. Pix access is blocked at the ISP level through simple IP blocking of any detected Pix infrastructure, combined with pervasive monitoring of any international payment activity.

User workarounds

Users in China with technical knowledge typically employ encrypted tunneling protocols to bypass DPI detection and DNS filtering. Standard approaches include proxied DNS queries routed through encrypted channels and VPN-style tunneling that masks SNI information. Users aware of specific Pix API endpoints may also route traffic through intermediary services, though this adds latency.

In North Korea, practical workarounds are extremely limited due to restricted international access. Only individuals with state-approved connections or foreign residents can access circumvention tools, and doing so carries severe penalties.

Alternatives

Wise (formerly TransferWise) operates in both China and North Korea with restricted functionality but less overt censorship in China due to its compliance-first model. Swift-based international transfers remain available in China through banks, though heavily monitored. PayPal has extremely limited service in China and is blocked in North Korea entirely.

Outlook

China's restrictions on Pix are likely to persist or increase as the PBOC develops domestic alternatives and tightens capital controls. North Korea's censorship will remain absolute absent significant geopolitical change. Neither jurisdiction shows indication of liberalizing payment system access.