diff --git a/src/Utils/AbiBase.php b/src/Utils/AbiBase.php
index 558240d..71cf80d 100644
--- a/src/Utils/AbiBase.php
+++ b/src/Utils/AbiBase.php
@@ -13,11 +13,24 @@ abstract class AbiBase
 
     public function __construct(ContractAbiType $type = ContractAbiType::CONSENSUS, ?string $path = null)
     {
-        $abiFilePath = $this->contractAbiPath($type, $path);
+        $abiFilePath = self::contractAbiPath($type, $path);
+        $decodedAbi  = self::loadAbiJson($abiFilePath);
 
-        $abiJson = file_get_contents($abiFilePath);
+        $this->abi = $decodedAbi['abi'];
+    }
+
+    public static function methodIdentifiers(
+        ContractAbiType $type = ContractAbiType::CONSENSUS,
+        ?string $path = null
+    ): array {
+        $abiFilePath = self::contractAbiPath($type, $path);
+        $decodedAbi  = self::loadAbiJson($abiFilePath);
+
+        if (! isset($decodedAbi['methodIdentifiers']) || ! is_array($decodedAbi['methodIdentifiers'])) {
+            throw new \RuntimeException("ABI JSON does not contain methodIdentifiers: {$abiFilePath}");
+        }
 
-        $this->abi = json_decode($abiJson, true)['abi'];
+        return $decodedAbi['methodIdentifiers'];
     }
 
     protected static function getArrayComponents(string $type): ?array
@@ -75,27 +88,38 @@ protected function toFunctionSelector(array $abiItem): string
         return $selector;
     }
 
-    private function contractAbiPath(ContractAbiType $type, ?string $path = null): ?string
+    protected static function contractAbiPath(ContractAbiType $type, ?string $path = null): string
     {
-        switch ($type) {
-            case ContractAbiType::CONSENSUS:
-                return __DIR__.'/Abi/json/Abi.Consensus.json';
-            case ContractAbiType::MULTIPAYMENT:
-                return __DIR__.'/Abi/json/Abi.Multipayment.json';
-            case ContractAbiType::USERNAMES:
-                return __DIR__.'/Abi/json/Abi.Usernames.json';
-            case ContractAbiType::ERC20BATCH_TRANSFER:
-                return __DIR__.'/Abi/json/Abi.ERC20BatchTransfer.json';
-            case ContractAbiType::TOKEN:
-                return __DIR__.'/Abi/json/Abi.Token.json';
-            case ContractAbiType::CUSTOM:
+        return match ($type) {
+            ContractAbiType::CONSENSUS           => __DIR__.'/Abi/json/Abi.Consensus.json',
+            ContractAbiType::MULTIPAYMENT        => __DIR__.'/Abi/json/Abi.Multipayment.json',
+            ContractAbiType::USERNAMES           => __DIR__.'/Abi/json/Abi.Usernames.json',
+            ContractAbiType::ERC20BATCH_TRANSFER => __DIR__.'/Abi/json/Abi.ERC20BatchTransfer.json',
+            ContractAbiType::TOKEN               => __DIR__.'/Abi/json/Abi.Token.json',
+            ContractAbiType::CUSTOM              => (function () use ($path): string {
                 if ($path === null || $path === '') {
                     throw new \InvalidArgumentException('A non-empty $path must be provided when using ContractAbiType::CUSTOM.');
                 }
 
                 return $path;
-            default:
-                throw new \InvalidArgumentException('Unhandled ContractAbiType: '.$type->name);
+            })(),
+        };
+    }
+
+    private static function loadAbiJson(string $path): array
+    {
+        $rawJson = file_get_contents($path);
+
+        if ($rawJson === false) {
+            throw new \RuntimeException("Unable to load ABI JSON: {$path}");
+        }
+
+        $decoded = json_decode($rawJson, true);
+
+        if (! is_array($decoded) || ! isset($decoded['abi']) || ! is_array($decoded['abi'])) {
+            throw new \RuntimeException("ABI JSON does not contain a valid abi array: {$path}");
         }
+
+        return $decoded;
     }
 }
diff --git a/src/Utils/TransactionTypeIdentifier.php b/src/Utils/TransactionTypeIdentifier.php
new file mode 100644
index 0000000..5e59f1b
--- /dev/null
+++ b/src/Utils/TransactionTypeIdentifier.php
@@ -0,0 +1,113 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ArkEcosystem\Crypto\Utils;
+
+use ArkEcosystem\Crypto\Enums\ContractAbiType;
+use ArkEcosystem\Crypto\Helpers;
+
+class TransactionTypeIdentifier
+{
+    private const TRANSFER_SIGNATURE = '';
+
+    private static ?array $signatures = null;
+
+    public static function isTransfer(string $data): bool
+    {
+        return $data === self::TRANSFER_SIGNATURE;
+    }
+
+    public static function isVote(string $data): bool
+    {
+        return self::startsWithSignature($data, self::signatures()['vote']);
+    }
+
+    public static function isUnvote(string $data): bool
+    {
+        return self::startsWithSignature($data, self::signatures()['unvote']);
+    }
+
+    public static function isMultiPayment(string $data): bool
+    {
+        return self::startsWithSignature($data, self::signatures()['multiPayment']);
+    }
+
+    public static function isUsernameRegistration(string $data): bool
+    {
+        return self::startsWithSignature($data, self::signatures()['registerUsername']);
+    }
+
+    public static function isUsernameResignation(string $data): bool
+    {
+        return self::startsWithSignature($data, self::signatures()['resignUsername']);
+    }
+
+    public static function isValidatorRegistration(string $data): bool
+    {
+        return self::startsWithSignature($data, self::signatures()['registerValidator']);
+    }
+
+    public static function isValidatorResignation(string $data): bool
+    {
+        return self::startsWithSignature($data, self::signatures()['resignValidator']);
+    }
+
+    public static function isUpdateValidator(string $data): bool
+    {
+        return self::startsWithSignature($data, self::signatures()['updateValidator']);
+    }
+
+    public static function isTokenTransfer(string $data): bool
+    {
+        $decodedData = static::decodeTokenFunction($data);
+
+        return $decodedData ? $decodedData['functionName'] === 'transfer' : false;
+    }
+
+    private static function startsWithSignature(string $data, string $signature): bool
+    {
+        return str_starts_with(
+            strtolower(Helpers::removeLeadingHexZero($data)),
+            strtolower($signature)
+        );
+    }
+
+    private static function signatures(): array
+    {
+        if (self::$signatures !== null) {
+            return self::$signatures;
+        }
+
+        $consensusMethods    = AbiBase::methodIdentifiers(ContractAbiType::CONSENSUS);
+        $multipaymentMethods = AbiBase::methodIdentifiers(ContractAbiType::MULTIPAYMENT);
+        $usernamesMethods    = AbiBase::methodIdentifiers(ContractAbiType::USERNAMES);
+
+        self::$signatures = [
+            'multiPayment'      => $multipaymentMethods['pay(address[],uint256[])'],
+            'registerUsername'  => $usernamesMethods['registerUsername(string)'],
+            'resignUsername'    => $usernamesMethods['resignUsername()'],
+            'registerValidator' => $consensusMethods['registerValidator(bytes)'],
+            'resignValidator'   => $consensusMethods['resignValidator()'],
+            'vote'              => $consensusMethods['vote(address)'],
+            'unvote'            => $consensusMethods['unvote()'],
+            'updateValidator'   => $consensusMethods['updateValidator(bytes)'],
+            'transfer'          => 'transfer',
+        ];
+
+        return self::$signatures;
+    }
+
+    private static function decodeTokenFunction(string $data): ?array
+    {
+        try {
+            $decodedData = (new AbiDecoder(ContractAbiType::TOKEN))->decodeFunctionData($data);
+
+            return ['functionName' => $decodedData['functionName'], 'args' => $decodedData['args']];
+        } catch (\Exception $e) {
+            // Different abi type. Ignore.
+        }
+
+        return null;
+    }
+}
diff --git a/tests/Unit/Enums/AbiFunctionTest.php b/tests/Unit/Enums/AbiFunctionTest.php
index a6e73ee..d7cee8f 100644
--- a/tests/Unit/Enums/AbiFunctionTest.php
+++ b/tests/Unit/Enums/AbiFunctionTest.php
@@ -3,6 +3,7 @@
 declare(strict_types=1);
 
 use ArkEcosystem\Crypto\Enums\AbiFunction;
+use ArkEcosystem\Crypto\Transactions\Types\EvmCall;
 use ArkEcosystem\Crypto\Transactions\Types\Multipayment;
 use ArkEcosystem\Crypto\Transactions\Types\Unvote;
 use ArkEcosystem\Crypto\Transactions\Types\UsernameRegistration;
@@ -21,4 +22,6 @@
     'UsernameRegistration'  => ['USERNAME_REGISTRATION', UsernameRegistration::class],
     'UsernameResignation'   => ['USERNAME_RESIGNATION', UsernameResignation::class],
     'Multipayment'          => ['MULTIPAYMENT', Multipayment::class],
+    'Transfer'              => ['TRANSFER', EvmCall::class],
+    'Approve'               => ['APPROVE', EvmCall::class],
 ]);
diff --git a/tests/Unit/Utils/AbiEncoderTest.php b/tests/Unit/Utils/AbiEncoderTest.php
index fcc715c..14a5189 100644
--- a/tests/Unit/Utils/AbiEncoderTest.php
+++ b/tests/Unit/Utils/AbiEncoderTest.php
@@ -20,6 +20,32 @@ function testPrivateMethod(string $methodName, &$object): ReflectionMethod
     $this->encoder = new AbiEncoder();
 });
 
+it('should require a non-empty custom ABI path', function () {
+    new AbiEncoder(ContractAbiType::CUSTOM);
+})->throws(
+    InvalidArgumentException::class,
+    'A non-empty $path must be provided when using ContractAbiType::CUSTOM.'
+);
+
+it('should fail when custom ABI file cannot be read', function () {
+    $previousErrorReporting = error_reporting();
+    error_reporting($previousErrorReporting & ~E_WARNING);
+
+    try {
+        new AbiEncoder(ContractAbiType::CUSTOM, dirname(__DIR__, 3).'/tests/fixtures/does-not-exist.json');
+    } finally {
+        error_reporting($previousErrorReporting);
+    }
+})->throws(RuntimeException::class, 'Unable to load ABI JSON');
+
+it('should fail when custom ABI JSON is missing abi array', function () {
+    new AbiEncoder(ContractAbiType::CUSTOM, dirname(__DIR__, 3).'/tests/fixtures/message-sign.json');
+})->throws(RuntimeException::class, 'ABI JSON does not contain a valid abi array');
+
+it('should fail when custom ABI JSON is missing method identifiers', function () {
+    AbiEncoder::methodIdentifiers(ContractAbiType::CUSTOM, dirname(__DIR__, 3).'/tests/fixtures/mock-abi.json');
+})->throws(RuntimeException::class, 'ABI JSON does not contain methodIdentifiers');
+
 it('should encode vote function call', function () {
     $functionName        = 'vote';
     $args                = ['0x512F366D524157BcF734546eB29a6d687B762255'];
diff --git a/tests/Unit/Utils/TransactionTypeIdentifierTest.php b/tests/Unit/Utils/TransactionTypeIdentifierTest.php
new file mode 100644
index 0000000..ec8737c
--- /dev/null
+++ b/tests/Unit/Utils/TransactionTypeIdentifierTest.php
@@ -0,0 +1,101 @@
+<?php
+
+declare(strict_types=1);
+
+use ArkEcosystem\Crypto\Utils\TransactionTypeIdentifier;
+
+function loadMethodIdentifiers(string $path): array
+{
+    $json = file_get_contents($path);
+
+    expect($json)->not->toBeFalse();
+
+    $decoded = json_decode($json, true);
+
+    expect($decoded)->toBeArray();
+    expect($decoded)->toHaveKey('methodIdentifiers');
+
+    return $decoded['methodIdentifiers'];
+}
+
+beforeEach(function () {
+    $this->consensusMethods    = loadMethodIdentifiers(dirname(__DIR__, 3).'/src/Utils/Abi/json/Abi.Consensus.json');
+    $this->multipaymentMethods = loadMethodIdentifiers(dirname(__DIR__, 3).'/src/Utils/Abi/json/Abi.Multipayment.json');
+    $this->usernamesMethods    = loadMethodIdentifiers(dirname(__DIR__, 3).'/src/Utils/Abi/json/Abi.Usernames.json');
+});
+
+it('identifies transfer by empty payload', function () {
+    expect(TransactionTypeIdentifier::isTransfer(''))->toBeTrue();
+    expect(TransactionTypeIdentifier::isTransfer('0x'))->toBeFalse();
+    expect(TransactionTypeIdentifier::isTransfer('12345678'))->toBeFalse();
+});
+
+it('identifies vote signature', function () {
+    $signature = $this->consensusMethods['vote(address)'];
+
+    expect(TransactionTypeIdentifier::isVote($signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isVote('0x'.$signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isVote('1234567'))->toBeFalse();
+});
+
+it('identifies unvote signature', function () {
+    $signature = $this->consensusMethods['unvote()'];
+
+    expect(TransactionTypeIdentifier::isUnvote($signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isUnvote('0x'.$signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isUnvote('1234567'))->toBeFalse();
+});
+
+it('identifies multipayment signature', function () {
+    $signature = $this->multipaymentMethods['pay(address[],uint256[])'];
+
+    expect(TransactionTypeIdentifier::isMultiPayment($signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isMultiPayment('0x'.$signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isMultiPayment('1234567'))->toBeFalse();
+});
+
+it('identifies username registration signature', function () {
+    $signature = $this->usernamesMethods['registerUsername(string)'];
+
+    expect(TransactionTypeIdentifier::isUsernameRegistration($signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isUsernameRegistration('0x'.$signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isUsernameRegistration('1234567'))->toBeFalse();
+});
+
+it('identifies username resignation signature', function () {
+    $signature = $this->usernamesMethods['resignUsername()'];
+
+    expect(TransactionTypeIdentifier::isUsernameResignation($signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isUsernameResignation('0x'.$signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isUsernameResignation('1234567'))->toBeFalse();
+});
+
+it('identifies validator registration signature', function () {
+    $signature = $this->consensusMethods['registerValidator(bytes)'];
+
+    expect(TransactionTypeIdentifier::isValidatorRegistration($signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isValidatorRegistration('0x'.$signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isValidatorRegistration('1234567'))->toBeFalse();
+});
+
+it('identifies validator resignation signature', function () {
+    $signature = $this->consensusMethods['resignValidator()'];
+
+    expect(TransactionTypeIdentifier::isValidatorResignation($signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isValidatorResignation('0x'.$signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isValidatorResignation('1234567'))->toBeFalse();
+});
+
+it('identifies update validator signature', function () {
+    $signature = $this->consensusMethods['updateValidator(bytes)'];
+
+    expect(TransactionTypeIdentifier::isUpdateValidator($signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isUpdateValidator('0x'.$signature))->toBeTrue();
+    expect(TransactionTypeIdentifier::isUpdateValidator('1234567'))->toBeFalse();
+});
+
+it('identifies token transfer payloads', function () {
+    expect(TransactionTypeIdentifier::isTokenTransfer('0xa9059cbb000000000000000000000000a5cc0bfeb09742c5e4c610f2ebaab82eb142ca10000000000000000000000000000000000000009bd2ffdd71438a49e803314000'))->toBeTrue();
+    expect(TransactionTypeIdentifier::isTokenTransfer('0x'.str_repeat('0', 64)))->toBeFalse();
+    expect(TransactionTypeIdentifier::isTokenTransfer('1234567'))->toBeFalse();
+});