A SWIFT MT799 is a free-format, authenticated text message sent between banks over the SWIFT network, typically used to confirm proof of funds or to pre-advise a larger transaction. It carries no payment obligation, moves no money, and cannot block or reserve funds in any account. Because it travels through a trusted interbank channel and looks official, it is also one of the most abused message types in financial fraud, and anyone being shown an MT799 as part of a deal should understand what it can and cannot do before signing anything or wiring a dollar.
What an MT799 Actually Is
The MT799 sits inside SWIFT’s Category 7, which covers documentary credits and guarantees. Within that category, it is classified as a free-format message: the sender writes the content in plain text instead of filling in the structured fields other SWIFT messages require.1SWIFT. MT Category 7 Enhancements Overview That flexibility is the point. Banks use it when they need to say something authenticated to another bank that doesn’t fit a rigid template.
What matters more is what the message is not. An MT799 is not a guarantee, not a commitment to pay, and not a transfer of funds. It does not block, reserve, or encumber money. The recipient bank knows the message genuinely came from the sending institution because it passed through the encrypted SWIFT terminal, but the content creates no automatic legal or financial obligation. The recipient still has to evaluate whatever the message says on its own merits.
It is also a snapshot in time, not an open-ended commitment. There is no standard validity period baked into the format. When a bank sends an MT799 confirming a client’s funds, the message typically names a specific expiry date in the text. Once that date passes, the confirmation means nothing, and a fresh message would need to be sent if the counterparty still wants assurance.
The SWIFT network itself connects more than 11,500 financial institutions across over 200 countries, which is why a message routed through it carries weight that a PDF emailed from a stranger does not.2Swift. Who We Are
When Banks Legitimately Send an MT799
The most common legitimate use is proof of funds. In large commodity deals, infrastructure projects, or commercial real estate transactions, a seller wants assurance the buyer can actually close before anyone invests in contracts and legal work. The buyer’s bank sends an MT799 to the seller’s bank confirming the client holds sufficient funds as of a specific date. This carries more weight than a bank statement attached to an email, because the recipient bank can independently verify the message arrived through SWIFT.
The second common use is pre-advice before a letter of credit or guarantee is issued. Before formally opening a letter of credit, a bank may send an MT799 to the advising bank indicating that the credit is forthcoming and preliminary checks are complete. The beneficiary’s bank can then prepare on its end, and both institutions can flag problems before any binding instrument is in play.
Less often, the MT799 handles miscellaneous bank-to-bank communications in trade finance that lack their own message type: requests for clarification on shipping document discrepancies, supplementary information about a client, or coordination on timing in a multi-party transaction. The free-format structure makes it a catch-all for things that need authentication but don’t fit a structured template.
How the MT799 Differs From an MT700 or MT760
Confusing these three message types is where serious misunderstandings begin, and where fraudsters do their work.
The MT700 is the SWIFT message used to issue a documentary credit, commonly known as a letter of credit. When a bank sends an MT700, it is formally opening a credit on behalf of its client and transmitting the terms to the advising bank.3Swift. Category 7 Message Reference Guide Advance Information That creates real obligations.
The MT760 goes further. It is a structured guarantee issuance message. When a bank transmits an MT760, it is typically creating an enforceable undertaking such as a bank guarantee or standby letter of credit, and the issuing bank is putting its own creditworthiness on the line.
The MT799 is the conversation that happens before either of those instruments gets issued. A bank might send one to signal that its client has been vetted, that funds exist, or that it is prepared to issue a guarantee once certain conditions are met. It sets the stage without making promises. Treating an MT799 as if it carried the weight of an MT760 is a mistake fraudsters count on.
How to Request an MT799 From Your Bank
Requesting an MT799 starts at your bank’s trade finance or international banking department. You will need to provide several pieces of information, and getting any of them wrong can delay the process or send the message to the wrong institution.
- Your full account name and number at the sending bank.
- The recipient bank’s Business Identifier Code (BIC), the 8-character alphanumeric code sometimes extended to 11 characters with a branch identifier. A single wrong character routes the message to the wrong bank. Verify the BIC directly through SWIFT’s online directory rather than relying on what a counterparty gives you.4Swift. Business Identifier Code (BIC)
- The exact wording you want transmitted. In trade finance, the counterparty’s bank often specifies required language. Your bank’s compliance team may modify wording that reads like a guarantee or a binding commitment.
- Supporting documentation: a copy of the underlying contract, transaction reference number, or deal memorandum, which the bank needs for its compliance and anti-money-laundering review.
Your bank will have an internal SWIFT request form that captures all of this. Filling it out accurately the first time matters more than people expect. Compliance review is where most delays happen, and incomplete or inconsistent information triggers additional rounds of questions.
Once you submit the form, compliance reviews your identity, account standing, the purpose of the message, and whether the transaction or counterparty raises sanctions or AML flags. This typically takes 24 to 72 hours, longer for complex situations or unfamiliar counterparties. After clearance, an officer enters the message into the SWIFT terminal, and it travels through the encrypted network to the recipient bank.
When the network accepts the message, it generates an acknowledgment known as an ACK. One point worth clarifying: the ACK confirms SWIFT accepted the message as valid, not that the recipient bank has read it. A separate delivery notification handles that step. A negative acknowledgment, or NAK, means SWIFT rejected the message, usually for a formatting error or an invalid BIC.
Keep the ACK or your bank’s printed confirmation. It is evidence that your bank transmitted the specified information on a particular date, which can matter later if a dispute arises about whether pre-advice was given.
What It Costs
Banks charge a service fee for transmitting an MT799, and the amount varies significantly by institution, transaction size, and message complexity. Some banks use a flat fee, others a tiered structure based on the underlying deal value. Ask your trade finance department for a quote before submitting the request, and factor it in alongside any compliance or document preparation fees charged separately.
Red Flags and Fraud Patterns
This is where MT799 messages cause the most real-world harm. Because the format is authenticated and travels through SWIFT, fraudsters use its appearance of legitimacy to deceive investors and counterparties. The FBI has issued a public service announcement warning that fraud actors use counterfeit SWIFT messages, including MT799 and MT760 formats, to legitimize scams involving fictitious standby letters of credit.5Internet Crime Complaint Center (IC3). FBI Warns of Fraud Actors Scamming Investors Through Fictitious Standby Letters of Credit
The core scam works like this: a promoter claims an MT799 can serve as collateral, generate yield, or trigger a loan disbursement. None of that is true. An MT799 is a text message between banks. It cannot be monetized, traded, or used as a financial instrument. If anyone in a deal describes an MT799 as an asset or a funding mechanism, that alone is a fraud indicator.
The FBI identifies several specific red flags:5Internet Crime Complaint Center (IC3). FBI Warns of Fraud Actors Scamming Investors Through Fictitious Standby Letters of Credit
- Claims that an MT799 blocks, reserves, or ring-fences funds. It cannot do any of those things.
- Requests for advance fees labeled as “compliance fees,” “bank facilitation fees,” or “verification charges” before the message is sent. This is a textbook advance-fee pattern.
- Returns disproportionate to risk, including non-recourse loans tied to SWIFT messages.
- Use of the word “monetize” in connection with SWIFT instruments, which the FBI specifically flags.
- Unnecessary secrecy, non-disclosure agreements over the transaction structure, or vague explanations for why promised funds have not materialized.
- PDF or email copies of SWIFT messages presented as proof. Genuine MT799 messages travel exclusively over the SWIFT network between authenticated bank terminals. A screenshot or PDF of an MT799 proves nothing.
If you encounter any of these, contact your bank’s trade finance department directly and ask them to verify whether a legitimate SWIFT message was actually received through their terminal. Verification happens through the bank’s SWIFT interface, which confirms the sending bank’s BIC, the transmission timestamp, and message integrity. Do not rely on documents provided by the counterparty or their broker. If the only evidence of an MT799 lives outside the SWIFT network, there is no MT799.