O que é Nested correspondent?

--- title: O que é Nested correspondent? source_page: https://www.sardine.ai/pt/learn/nested-correspondent canonical: https://www.sardine.ai/pt/learn/nested-correspondent format: text/markdown description: Nested correspondence is when a correspondent bank's account is used, often without full disclosure, by that bank's own customers or by other downstream institutions. The correspondent ends up serving parties it never onboarded. --- **Quick links:** [Human page](https://www.sardine.ai/pt/learn/nested-correspondent) · [Home](https://www.sardine.ai) · [Customers](https://www.sardine.ai/pt/customers) · [Blog](https://www.sardine.ai/pt/blog) · [Demo](https://www.sardine.ai/pt/demo) --- # O que é Nested correspondent? **Read time:** 4 Nested correspondence is when a correspondent bank's account is used, often without full disclosure, by that bank's own customers or by other downstream institutions. The correspondent ends up serving parties it never onboarded. A nested correspondent relationship is when a bank uses its own correspondent account to provide services to other financial institutions or their customers, hiding the true originator of a payment. The correspondent bank thinks it is serving one respondent, when in fact it is unknowingly banking a chain of institutions it never onboarded. What is nesting? Nesting, sometimes called downstream or nested correspondent banking, happens when a respondent bank resells its correspondent access. Instead of just moving its own customers' payments through the correspondent, it lets other banks, exchange houses, or money service businesses use that same account to reach the correspondent's network. Those downstream institutions never had to pass the correspondent's onboarding; they ride in behind the respondent. The result is a hidden layer of unknown institutions sitting between the correspondent and the real originator of a payment. The correspondent believes it is processing traffic for one respondent it vetted, when in reality it is indirectly banking a string of third-party institutions in jurisdictions and risk profiles it never assessed. That is exactly the visibility gap money launderers and sanctions evaders look for. For an AML team, nesting is a due diligence blind spot inside an already high-risk product. Correspondent banking is risky because the correspondent cannot see the respondent's customers; nesting stacks a second unseen layer on top, so a single account can carry the activity of institutions the correspondent has no idea it is serving. How nesting hides the originator The layering builds up quietly, one relationship at a time: Access — Respondent opens the account. A respondent bank sets up a correspondent account, vetted for its own expected business. Resell — Downstream banks plug in. The respondent lets other institutions route their payments through that same account. Obscure — Originators disappear. Payments from unknown third-party customers arrive labeled as the respondent's own traffic. Exploit — Risk rides in unseen. Higher-risk or sanctioned flows pass through a channel the correspondent believes it fully understands. Who is involved? What it looks like in practice A global bank opens a correspondent account for a mid-sized foreign bank after reviewing its business as a domestic lender. Over time, that respondent starts offering payment access to several small exchange houses in a neighboring high-risk region, routing their traffic through the same account. The global bank now sees a surge in cross-border payments it attributes to its known respondent, with originator names it does not recognize and volumes far beyond what a domestic lender should generate. Only after an investigation does it discover the account has been quietly serving a nest of exchange houses it never vetted, some handling flows that would have failed its own onboarding. Why it matters to operators Nesting defeats the core assumption of correspondent risk management, that you know your respondent and rely on it to know its customers. When the respondent silently adds downstream institutions, the correspondent's due diligence is measuring the wrong entity. Sanctioned parties, unlicensed money transmitters, and laundered proceeds can all move through an account the correspondent believes it has fully mapped, which is precisely how these relationships end up in enforcement actions. Because the extra layer is often undisclosed, it usually has to be flushed out through diligence and monitoring rather than spotted on the face of a payment. Asking respondents directly whether they provide nested services, understanding their customer base of other institutions, and watching for volumes and originators that do not match the respondent's declared profile are the practical ways to surface it. What to watch in the data Unrecognized originators. Payment traffic naming customers or institutions that do not fit the respondent you onboarded. Volume beyond profile. Activity far larger or more international than the respondent's declared business could plausibly generate. Institutional payers. Frequent counterparties that are themselves banks, exchanges, or money service businesses. High-risk geography creep. Growing flows to or from jurisdictions the respondent never mentioned at onboarding. Evasive answers. A respondent that is vague or resistant when asked directly whether it offers downstream or nested access. Quick questions ### How is nesting different from ordinary correspondent banking? Ordinary correspondent banking has one unseen layer: the respondent's own customers. Nesting adds a second, where the respondent resells its access to other institutions, so the correspondent is unknowingly banking banks it never onboarded. ### Is nesting illegal? Not inherently, but it must be disclosed and managed. The danger is undisclosed nesting, where the correspondent cannot assess or screen the hidden institutions, which is what turns it into a serious AML and sanctions exposure. ### How do banks detect it? Mostly through diligence and monitoring: asking respondents whether they provide nested services, reviewing their customer base, and flagging payment volumes, originators, or geographies that do not match the respondent's stated profile. ### Why do launderers like nested accounts? They add distance between the illicit originator and the correspondent that screens the payment. Each hidden layer makes it harder to identify who is really sending the money and easier to slip past sanctions and AML controls. ### What is the connection to shell banks? Nesting can be a way for a shell bank or unlicensed transmitter to reach the mainstream financial system through a legitimate respondent's account, which is one reason correspondents are expected to bar shell banks and probe for nested access.