diff --git a/src/Api/FinancialApi.php b/src/Api/FinancialApi.php
new file mode 100644
index 0000000..4e0ab03
--- /dev/null
+++ b/src/Api/FinancialApi.php
@@ -0,0 +1,67 @@
+<?php declare(strict_types = 1);
+
+namespace SandwaveIo\RealtimeRegister\Api;
+
+use SandwaveIo\RealtimeRegister\Domain\ExchangeRates;
+use SandwaveIo\RealtimeRegister\Domain\Transaction;
+use SandwaveIo\RealtimeRegister\Domain\TransactionCollection;
+
+final class FinancialApi extends AbstractApi
+{
+    /**
+     * @see https://dm.realtimeregister.com/docs/api/transactions/get
+     *
+     * @param int $transactionId
+     *
+     * @throws \Exception
+     *
+     * @return Transaction
+     */
+    public function getTransaction(int $transactionId): Transaction
+    {
+        $response = $this->client->get(sprintf('v2/billing/financialtransactions/%d', $transactionId));
+        return Transaction::fromArray($response->json());
+    }
+
+    /**
+     * @see https://dm.realtimeregister.com/docs/api/transactions/list
+     *
+     * @param int|null              $limit
+     * @param int|null              $offset
+     * @param string|null           $search
+     * @param array<string, string> $parameters
+     *
+     * @return TransactionCollection
+     */
+    public function listTransactions(
+        ?int $limit = null,
+        ?int $offset = null,
+        ?string $search = null,
+        ?array $parameters = null
+    ): TransactionCollection {
+        $query = [];
+        if (! is_null($limit)) {
+            $query['limit'] = $limit;
+        }
+        if (! is_null($offset)) {
+            $query['offset'] = $offset;
+        }
+        if (! is_null($search)) {
+            $query['q'] = $search;
+        }
+        if (! is_null($parameters)) {
+            $query = array_merge($parameters, $query);
+        }
+
+        $response = $this->client->get('v2/billing/financialtransactions', $query);
+
+        return TransactionCollection::fromArray($response->json());
+    }
+
+    /* @see https://dm.realtimeregister.com/docs/api/exchangerates */
+    public function exchangeRates(string $currency): ExchangeRates
+    {
+        $response = $this->client->get("v2/exchangerates/{$currency}");
+        return ExchangeRates::fromArray($response->json());
+    }
+}
diff --git a/src/Domain/ExchangeRates.php b/src/Domain/ExchangeRates.php
new file mode 100644
index 0000000..9deb9bb
--- /dev/null
+++ b/src/Domain/ExchangeRates.php
@@ -0,0 +1,28 @@
+<?php declare(strict_types = 1);
+
+namespace SandwaveIo\RealtimeRegister\Domain;
+
+class ExchangeRates implements DomainObjectInterface
+{
+    private function __construct(public readonly string $currency, public readonly ?array $exchangerates = null)
+    {
+    }
+
+    public static function fromArray(array $json): self
+    {
+        return new ExchangeRates(
+            currency: $json['currency'],
+            exchangerates: $json['exchangerates'] ?? null
+        );
+    }
+
+    public function toArray(): array
+    {
+        return array_filter([
+            'currency' => $this->currency,
+            'exchangerates' => $this->exchangerates ?? null,
+        ], function ($x) {
+            return ! is_null($x);
+        });
+    }
+}
diff --git a/src/Domain/Transaction.php b/src/Domain/Transaction.php
new file mode 100644
index 0000000..b6a0d54
--- /dev/null
+++ b/src/Domain/Transaction.php
@@ -0,0 +1,75 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace SandwaveIo\RealtimeRegister\Domain;
+
+use DateTimeImmutable;
+use DateTimeInterface;
+use Exception;
+use Webmozart\Assert\Assert;
+
+final class Transaction implements DomainObjectInterface
+{
+    private function __construct(
+        public int $id,
+        public string $customer,
+        public DateTimeInterface $date,
+        public int $amount,
+        public string $currency,
+        public int $processId,
+        public string $processType,
+        public string $processIdentifier,
+        public string $processAction,
+        /** @var array<string, int>|null */
+        public ?array $chargesPerAccount,
+        public ?BillableCollection $billables
+    ) {
+    }
+
+    public function toArray(): array
+    {
+        return array_filter(
+            [
+                'id' => $this->id,
+                'customer' => $this->customer,
+                'date' => $this->date->format('Y-m-d\TH:i:s\Z'),
+                'amount' => $this->amount,
+                'currency' => $this->currency,
+                'processId' => $this->processId,
+                'processType' => $this->processType,
+                'processIdentifier' => $this->processIdentifier,
+                'processAction' => $this->processAction,
+                'chargesPerAccount' => $this->chargesPerAccount,
+                'billables' => $this->billables?->toArray(),
+            ],
+            static function ($x) {
+                return ! is_null($x);
+            }
+        );
+    }
+
+    /**
+     * @throws Exception
+     */
+    public static function fromArray(array $json): Transaction
+    {
+        if (array_key_exists('chargesPerAccount', $json)) {
+            Assert::isArray($json['chargesPerAccount']);
+        }
+
+        return new Transaction(
+            id: $json['id'],
+            customer: $json['customer'],
+            date: new DateTimeImmutable($json['date']),
+            amount: $json['amount'],
+            currency: $json['currency'],
+            processId: $json['processId'],
+            processType: $json['processType'],
+            processIdentifier: $json['processIdentifier'],
+            processAction: $json['processAction'],
+            chargesPerAccount: $json['chargesPerAccount'] ?? null,
+            billables: isset($json['billables']) ? BillableCollection::fromArray($json['billables']) : null
+        );
+    }
+}
diff --git a/src/Domain/TransactionCollection.php b/src/Domain/TransactionCollection.php
new file mode 100644
index 0000000..f48153e
--- /dev/null
+++ b/src/Domain/TransactionCollection.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace SandwaveIo\RealtimeRegister\Domain;
+
+use Exception;
+
+class TransactionCollection extends AbstractCollection
+{
+    /** @var Transaction[] */
+    public array $entities;
+
+    public static function fromArray(array $json): TransactionCollection
+    {
+        return parent::fromArray($json);
+    }
+
+    public function offsetGet($offset): ?Transaction
+    {
+        return $this->entities[$offset] ?? null;
+    }
+
+    /**
+     * @throws Exception
+     */
+    public static function parseChild(array $json): Transaction
+    {
+        return Transaction::fromArray($json);
+    }
+}
diff --git a/src/RealtimeRegister.php b/src/RealtimeRegister.php
index 016b9e4..03d7558 100644
--- a/src/RealtimeRegister.php
+++ b/src/RealtimeRegister.php
@@ -9,6 +9,7 @@
 use SandwaveIo\RealtimeRegister\Api\CustomersApi;
 use SandwaveIo\RealtimeRegister\Api\DnsTemplatesApi;
 use SandwaveIo\RealtimeRegister\Api\DomainsApi;
+use SandwaveIo\RealtimeRegister\Api\FinancialApi;
 use SandwaveIo\RealtimeRegister\Api\NotificationsApi;
 use SandwaveIo\RealtimeRegister\Api\ProcessesApi;
 use SandwaveIo\RealtimeRegister\Api\ProvidersApi;
@@ -39,6 +40,8 @@ final class RealtimeRegister
 
     public TLDsApi $tlds;
 
+    public FinancialApi $financial;
+
     public function __construct(
         string $apiKey,
         ?string $baseUrl = null,
@@ -60,5 +63,6 @@ public function setClient(AuthorizedClient $client): void
         $this->providers = new ProvidersApi($client);
         $this->dnstemplates = new DnsTemplatesApi($client);
         $this->tlds = new TLDsApi($client);
+        $this->financial = new FinancialApi($client);
     }
 }
diff --git a/tests/Clients/FinancialApiExchangeRatesTest.php b/tests/Clients/FinancialApiExchangeRatesTest.php
new file mode 100644
index 0000000..1defc04
--- /dev/null
+++ b/tests/Clients/FinancialApiExchangeRatesTest.php
@@ -0,0 +1,27 @@
+<?php
+declare(strict_types = 1);
+
+namespace Clients;
+
+use PHPUnit\Framework\TestCase;
+use SandwaveIo\RealtimeRegister\Domain\ExchangeRates;
+use SandwaveIo\RealtimeRegister\Tests\Helpers\MockedClientFactory;
+use Webmozart\Assert\Assert;
+
+class FinancialApiExchangeRatesTest extends TestCase
+{
+    public function test_exchangerates(): void
+    {
+        /** @var string $responseBody */
+        $responseBody = json_encode(include __DIR__ . '/../Domain/data/exchangerates_valid.php');
+        Assert::string($responseBody);
+        $sdk = MockedClientFactory::makeSdk(
+            200,
+            $responseBody,
+            MockedClientFactory::assertRoute('GET', 'v2/exchangerates/EUR', $this)
+        );
+
+        $response = $sdk->financial->exchangeRates('EUR');
+        $this->assertInstanceOf(ExchangeRates::class, $response);
+    }
+}
diff --git a/tests/Clients/FinancialApiGetTransactionTest.php b/tests/Clients/FinancialApiGetTransactionTest.php
new file mode 100644
index 0000000..5279725
--- /dev/null
+++ b/tests/Clients/FinancialApiGetTransactionTest.php
@@ -0,0 +1,27 @@
+<?php
+declare(strict_types = 1);
+
+namespace Clients;
+
+use PHPUnit\Framework\TestCase;
+use SandwaveIo\RealtimeRegister\Domain\Transaction;
+use SandwaveIo\RealtimeRegister\Tests\Helpers\MockedClientFactory;
+use Webmozart\Assert\Assert;
+
+class FinancialApiGetTransactionTest extends TestCase
+{
+    public function test_get_transaction(): void
+    {
+        /** @var string $responseBody */
+        $responseBody = json_encode(include __DIR__ . '/../Domain/data/transaction_valid.php');
+        Assert::string($responseBody);
+        $sdk = MockedClientFactory::makeSdk(
+            200,
+            $responseBody,
+            MockedClientFactory::assertRoute('GET', 'v2/billing/financialtransactions/654563', $this)
+        );
+
+        $response = $sdk->financial->getTransaction(654563);
+        $this->assertInstanceOf(Transaction::class, $response);
+    }
+}
diff --git a/tests/Clients/FinancialApiListTransactionsTest.php b/tests/Clients/FinancialApiListTransactionsTest.php
new file mode 100644
index 0000000..ad19043
--- /dev/null
+++ b/tests/Clients/FinancialApiListTransactionsTest.php
@@ -0,0 +1,102 @@
+<?php
+declare(strict_types = 1);
+
+namespace Clients;
+
+use PHPUnit\Framework\TestCase;
+use SandwaveIo\RealtimeRegister\Tests\Helpers\MockedClientFactory;
+use Webmozart\Assert\Assert;
+
+class FinancialApiListTransactionsTest extends TestCase
+{
+    public function test_list_transactions(): void
+    {
+        /** @var string $responseBody */
+        $responseBody = json_encode(
+            [
+                'entities' => [
+                    include __DIR__ . '/../Domain/data/transaction_valid.php',
+                    include __DIR__ . '/../Domain/data/transaction_valid.php',
+                    include __DIR__ . '/../Domain/data/transaction_valid.php',
+                ],
+                'pagination' => [
+                    'total' => 3,
+                    'offset' => 0,
+                    'limit' => 10,
+                ],
+            ]
+        );
+        Assert::string($responseBody);
+        $sdk = MockedClientFactory::makeSdk(
+            200,
+            $responseBody,
+            MockedClientFactory::assertRoute('GET', 'v2/billing/financialtransactions', $this)
+        );
+
+        $sdk->financial->listTransactions();
+    }
+
+    public function test_list_with_queries(): void
+    {
+        /** @var string $responseBody */
+        $responseBody = json_encode(
+            [
+                'entities' => [
+                    include __DIR__ . '/../Domain/data/transaction_valid.php',
+                    include __DIR__ . '/../Domain/data/transaction_valid.php',
+                ],
+                'pagination' => [
+                    'total' => 2,
+                    'offset' => 0,
+                    'limit' => 2,
+                ],
+            ]
+        );
+        Assert::string($responseBody);
+
+        $sdk = MockedClientFactory::makeSdk(
+            200,
+            $responseBody,
+            MockedClientFactory::assertRoute('GET', 'v2/billing/financialtransactions', $this)
+        );
+
+        $sdk->financial->listTransactions(2, 0, 'identifier:eq=something');
+    }
+
+    public function test_list_with_search_and_parameters(): void
+    {
+        $parameters = [
+            'processType' => 'incomingTransfer',
+            'order' => '-updatedDate',
+        ];
+
+        /** @var string $responseBody */
+        $responseBody = json_encode(
+            [
+                'entities' => [
+                    include __DIR__ . '/../Domain/data/transaction_valid.php',
+                    include __DIR__ . '/../Domain/data/transaction_valid.php',
+                ],
+                'pagination' => [
+                    'total' => 2,
+                    'offset' => 0,
+                    'limit' => 2,
+                ],
+            ]
+        );
+
+        $sdk = MockedClientFactory::makeSdk(
+            200,
+            $responseBody,
+            MockedClientFactory::assertRoute('GET', 'v2/billing/financialtransactions', $this, [
+                'processType' => 'incomingTransfer',
+                'order' => '-updatedDate',
+                'limit' => '2',
+                'offset' => '0',
+                'q' => 'search',
+            ])
+        );
+
+        $sdk->financial->listTransactions(2, 0, 'search', $parameters);
+    }
+}
diff --git a/tests/Domain/data/exchangerates_valid.php b/tests/Domain/data/exchangerates_valid.php
new file mode 100644
index 0000000..a2a58db
--- /dev/null
+++ b/tests/Domain/data/exchangerates_valid.php
@@ -0,0 +1,8 @@
+<?php declare(strict_types = 1);
+
+return  [
+    'currency' => 'EUR',
+    'exchangerates' => [
+        'USD' => 1000000,
+    ],
+];
diff --git a/tests/Domain/data/transaction_valid.php b/tests/Domain/data/transaction_valid.php
new file mode 100644
index 0000000..78dfe67
--- /dev/null
+++ b/tests/Domain/data/transaction_valid.php
@@ -0,0 +1,20 @@
+<?php declare(strict_types = 1);
+
+return  [
+    'id' => 654563,
+    'customer' => 'johndoe',
+    'date' => '2021-08-11T06:17:15Z',
+    'amount' => 1000000,
+    'currency' => 'EUR',
+    'processId' => 46069000,
+    'processType' => 'contact',
+    'processIdentifier' => 'rtr-handle123',
+    'processAction' => 'update',
+    'chargesPerAccount' => [
+        'USD' => 1000000,
+    ],
+    'billables' => [
+        include __DIR__ . '/billable_valid.php',
+        include __DIR__ . '/billable_valid.php',
+    ],
+];