Banco Central of Brasil has implemented new security guidelines for the Pix system that allow preventive and automatic blocking of bank accounts in situations of suspected irregularity. The measure, which is already in force in April 2026, aims to strengthen the fight against fraud and financial crimes that use the speed of instant transfers to divert resources. With the update, financial institutions gain the autonomy to suspend transactions even before a detailed analysis, acting promptly when detecting atypical behavior.
The initiative responds to the growth of digital scams and seeks to increase efficiency in recovering amounts stolen from victims. Além from immediate blocking, the new regulation improves money tracking, allowing the system to identify subsequent transfers made from the account that received the original amount. Essa Structural change makes it difficult to disperse resources between different accounts, a common tactic used by criminals to avoid freezing assets.
- Preventive blocking of values for up to 72 hours for detailed fraud analysis.
- Monitoring the entire chain of successive movements between different accounts.
- Mandatory integration of Mecanismo Especial of Devolução (MED) in banking applications.
- Deadline of up to 30 minutes for communication between banks after registering a dispute.
- Possibility of multiple partial blocks until the total amount of the fraud is recovered.
Criteria for the preventive suspension of movements
Automatic blocking does not occur on a discretionary basis, but is based on technical criteria established by the monetary authority to guarantee the legal security of account holders. Institutions’ security algorithms now cross-reference data in real time to identify transfers that drastically deviate from the user’s consumption pattern or geolocation. Quando a transaction is flagged, the amount is held in the destination account while the originating bank and the recipient verify the legitimacy of the operation.
The main triggers that lead to blocking include formal complaints registered by victims through the dispute button on the application or transactions that are incompatible with the financial history. Indícios that the destination account is used exclusively to receive funds arising from crimes, the so-called “orange accounts”, also cause the immediate suspension of any balance withdrawal.
Expanded tracking of deviated values
One of the biggest innovations of this rule is the ability of institutions to see beyond the first transaction carried out. Anteriormente, if a criminal transferred the stolen money to a second or third account within seconds, the blocking would be restricted only to the first recipient, often with a zero balance. Agora, Banco Central allows block orders to follow the money trail through successive layers of transfer within the financial system.
Financial sector experts indicate that this new layer of traceability can significantly reduce the success of scams that depend on the speed of dispersion. The goal is for the resource recovery rate in cases of fraud to increase considerably with this interconnectivity between the security areas of banks operating in Brasil.
Dispute procedure directly in the app
To make life easier for users who have been victims of a scam, the dispute process has been simplified and must be offered by financial institutions on their digital channels. The customer who identifies a fraudulent transaction can register the complaint directly in the transaction history, which triggers an immediate alert to Banco Central and the bank that received the amounts.
After registration, the receiving bank has a short period of time to preventively block any resources that are still available. Caso fraud is confirmed after the technical analysis that lasts a few days, the refund is made automatically to the payer’s account, respecting the balance limits found in the fraudster’s account.
Rules for returning resources in specific cases
It is essential that the account holder understands that the automatic blocking and refund mechanism are intended exclusively for cases of fraud, suspected crime or operational error in the banking system. Erros committed by the user themselves, such as entering an incorrect key Pix or sending money to the wrong person by mistake, are not covered by this preventive blocking tool.
In these situations of personal error, recovery of the value still depends on direct negotiation between the parties involved or appropriate legal measures, since the transaction was voluntarily authorized by the payer. Banco Central reinforces that the security of the system depends both on technological tools and on the user’s attention when confirming the recipient’s data before finalizing any financial transaction.
Impact on payment system agility
Although the focus is on security, Banco Central ensures that the speed characteristic of Pix will not be impaired for the vast majority of users who carry out legal and customary transactions. The artificial intelligence system used by banks is trained to minimize so-called “false positives”, preventing legitimate transfers from being blocked unnecessarily and causing inconvenience to customers.
Institutions that present high rates of undue blocking may be notified and penalized by the monetary authority, ensuring a balance between protection against crime and the fluidity of the instant payments market. The standards update is part of a continuous process of technological evolution of Pix to maintain its position as one of the safest systems in the world.
The new guidelines seek to close the loop on specialized gangs that used loopholes in banking response times to hide illicit assets. With automatic blocking, the national financial system takes a decisive step to discourage the practice of electronic crimes, offering a robust layer of protection that follows the evolution of digital threats in the current Brazilian scenario.