A Brazilian exchange contract is the registered record of one currency conversion: who converted, how much, at what rate, and for what declared purpose. An institution authorized by the Central Bank of Brazil (BCB) issues it at execution, transaction by transaction. Since May 4, 2026, conversions of fiat-referenced stablecoins fall under the same foreign-exchange classification (Central Bank of Brazil, 2026).
One conversion, one registered document
A Brazilian exchange contract works as a per-transaction register of currency conversion. Every conversion executed on the licensed rail generates its own document, issued at the moment of execution. The issuer is an institution the BCB has authorized to operate foreign exchange.
The document records the parties, the values in both currencies, the rate applied, and the declared purpose of the funds. Nothing in it is retrospective. The record exists because the conversion happened, written at the same instant, on the same rail.
Most markets treat a conversion as an event that leaves traces for someone to collect later. Brazil designed the conversion to file its own paperwork. That choice, much older than the current debate, is why the document now reads as an asset.
What does an exchange contract actually record?
Five elements carry the mechanism:
- the client converting;
- the institution executing;
- the value in each currency;
- the rate applied;
- the classification of the operation.
The classification is the field outsiders underestimate. It states why the money moved: goods, services, capital, or another declared purpose.
Each field is an answer to a question a reviewer will eventually ask. Who moved the money, how much, at what price, and on what grounds. One document holds the four answers for one conversion, with a supervised institution standing behind them.
Who issues the contract, and under whose authorization?
Issuance belongs to institutions the BCB authorizes to operate in foreign exchange, banks and authorized payment institutions among them. The authorization is specific to FX as a supervised activity. The register is the output that activity is required to produce.
This is where the audit value starts. A document weighs what the entity signing it weighs. Because issuance sits with supervised institutions, each contract carries the authorization behind it into the file.
On our rail the standard applies literally. ATTRUS operates in Brazil as a payment institution authorized by the Central Bank of Brazil (BCB). Exchange contracts are issued per transaction under that authorization.
Five dates are widening the documented perimeter
Brazil spent 2026 extending foreign-exchange discipline to instruments that used to sit outside it. The framework that brought virtual-asset services under FX and international-capital rules took effect on February 2, 2026. The change came through Resolutions 519, 520 and 521 (Central Bank of Brazil, 2026).
Since May 4, 2026, buying, selling or exchanging fiat-referenced stablecoins is classified as a foreign-exchange operation (Central Bank of Brazil, 2026). From October 1, 2026, Resolution 561 of April 30, 2026 bars virtual assets from settling eFX operations with counterparties abroad.
Resolution 584 of August 7, 2026 adds a retention window of up to 24 hours for transfers above US$10,000 (Central Bank of Brazil, 2026). It takes effect on January 1, 2027. By May 31, 2027, providers running eFX outside traditional licenses must hold payment-institution authorization.
Each date pulls more conversion activity toward the same destination: a supervised institution executing FX and producing a register. Whatever position a company takes on each rule, the direction does not change. More of what crosses Brazil's border will be documented conversion by conversion.
How does the contract work in a live cross-border flow?
Take a foreign platform selling to Brazilian customers without a local entity. Revenue arrives in BRL through Pix, which carried 46.1% of financial transactions in Brazil (Central Bank of Brazil, 2024). The platform needs that revenue as dollars somewhere else.
On a licensed rail the sequence is short. The Pay-In lands in a local account in the platform's name, and the FX executes as one leg. The exchange contract is issued at that execution, so settlement travels with its document already written.
That mechanism is the substance behind FX Settlement, and it is why investment platforms convert BRL to USD inside a regulated exchange-contract framework. When a counterparty asks about one conversion, the contract is retrieved for that conversion. Nobody has to remember what happened, because the rail wrote it down.
Records you retrieve beat records you rebuild
Run the practical test on any route you use today. A counterparty bank, an auditor or a regulator asks you to evidence one conversion from last March: value, rate, purpose, parties. On the documented rail the answer is one registered contract, pulled by transaction and handed over as issued.
Route the same conversion outside that framework and the evidence changes nature. There is no single document to pull, so proof gets rebuilt from statements, spreadsheets and memory, weeks later. Reviewers price the difference: a record produced at execution outweighs a narrative produced for the review.
Supervision reads the same records the market does. The register works as common ground between institution, client and regulator, which is what an audit trail is supposed to be. Our compliance framework describes how those controls run around every transaction.
Due diligence ends where the register begins
Understood as a mechanism, the exchange contract stops looking like friction and starts looking like prepaid evidence. Every conversion that runs through it settles a future audit question at no extra effort. The 2026 rulebook keeps enlarging what that covers.
For transparency: ATTRUS executes Brazilian FX under its own BCB authorization, and we answer for the contracts our rail issues. We published this explainer because the mechanism decides audits, and buyers should demand it from any provider they evaluate.
Frequently asked questions
Can a foreign company get exchange contracts without a Brazilian entity?
Yes. A licensed local institution executes the FX and issues the exchange contract per transaction on the company's behalf. The foreign company needs no local entity of its own; it needs a provider whose authorization covers foreign exchange in Brazil.
Do Brazil's 2026 stablecoin rules connect to exchange contracts?
Yes. Since May 4, 2026, buying, selling or exchanging fiat-referenced stablecoins is classified as a foreign-exchange operation (Central Bank of Brazil, 2026). From October 1, 2026, Resolution 561 also bars virtual assets from settling eFX operations with counterparties abroad.
What is the difference between an exchange contract and an invoice?
An invoice documents the commercial obligation between buyer and seller. The exchange contract documents the currency conversion itself: parties, values, rate and declared purpose, registered by an authorized institution at execution. An audit of cross-border flows usually needs both, and only the contract proves the FX.
Who supervises exchange contracts in Brazil?
The Central Bank of Brazil (BCB) authorizes and supervises the institutions that execute foreign exchange and issue the contracts. The document is the record that supervision, auditors and counterparty banks all read from the same page.
Reference note
Regulatory references follow Central Bank of Brazil (BCB) rules as published, as of August 2026. They cover Resolutions 519, 520 and 521 and the May 4, 2026 FX classification, Resolution 561 (April 30, 2026) and Resolution 584 (August 7, 2026).
This article is general information, not legal or financial advice. Last reviewed August 2026.