diff --git a/container/src/finance/lib/internal/fetch/blockchains/fetch.php b/container/src/finance/lib/internal/fetch/blockchains/fetch.php
index 6cc291e..7c6eed4 100644
--- a/container/src/finance/lib/internal/fetch/blockchains/fetch.php
+++ b/container/src/finance/lib/internal/fetch/blockchains/fetch.php
@@ -51,7 +51,7 @@ namespace docker_finance\blockchains
             parent::__construct($env);
         }
 
-        public function fetch(internal\Metadata $metadata = null): void
+        public function fetch(internal\Metadata|null $metadata = null): void
         {
             // API_SUBACCOUNT format: blockchain/account/address[,blockchain/account/address,...]"
             // TODO: if caller is using a custom delimiter, this will break!
diff --git a/container/src/finance/lib/internal/fetch/blockchains/internal/base.php b/container/src/finance/lib/internal/fetch/blockchains/internal/base.php
index b611ff6..2957a41 100644
--- a/container/src/finance/lib/internal/fetch/blockchains/internal/base.php
+++ b/container/src/finance/lib/internal/fetch/blockchains/internal/base.php
@@ -296,7 +296,7 @@ namespace docker_finance\blockchains
          *
          * @warning Implementation *should* param check for null.
          */
-        abstract public function fetch(internal\Metadata $metadata = null): void;
+        abstract public function fetch(internal\Metadata|null $metadata = null): void;
     }
 }  // namespace docker_finance\blockchains
 
diff --git a/container/src/finance/lib/internal/fetch/blockchains/internal/blockchains/algorand.php b/container/src/finance/lib/internal/fetch/blockchains/internal/blockchains/algorand.php
index 90aba85..82f846d 100644
--- a/container/src/finance/lib/internal/fetch/blockchains/internal/blockchains/algorand.php
+++ b/container/src/finance/lib/internal/fetch/blockchains/internal/blockchains/algorand.php
@@ -290,7 +290,7 @@ namespace docker_finance\blockchains\internal\blockchains
             $this->explorer = new algorand\AlgoIndexer($env);
         }
 
-        public function fetch(internal\Metadata $metadata = null): void
+        public function fetch(internal\Metadata|null $metadata = null): void
         {
             if (is_null($metadata)) {
                 utils\CLI::throw_fatal("metadata unavailable");
diff --git a/container/src/finance/lib/internal/fetch/blockchains/internal/blockchains/ethereum.php b/container/src/finance/lib/internal/fetch/blockchains/internal/blockchains/ethereum.php
index 66f860c..4ef2c1d 100644
--- a/container/src/finance/lib/internal/fetch/blockchains/internal/blockchains/ethereum.php
+++ b/container/src/finance/lib/internal/fetch/blockchains/internal/blockchains/ethereum.php
@@ -65,7 +65,7 @@ namespace docker_finance\blockchains\internal\blockchains\ethereum
          * @details Upstream returns a variable-size string with the higher length
          *   being ETH transferred. Example: 279006000000000000000 = 279.006
          */
-        private function amount_calculator(string $value, string $decimal = null): string
+        private function amount_calculator(string $value, string|null $decimal = null): string
         {
             // non-ERC-20
             if (empty($decimal)) {
@@ -342,7 +342,7 @@ namespace docker_finance\blockchains\internal\blockchains
             $this->explorer = new ethereum\Etherscan($env);
         }
 
-        public function fetch(internal\Metadata $metadata = null): void
+        public function fetch(internal\Metadata|null $metadata = null): void
         {
             if (is_null($metadata)) {
                 utils\CLI::throw_fatal("metadata unavailable");
diff --git a/container/src/finance/lib/internal/fetch/blockchains/internal/blockchains/tezos.php b/container/src/finance/lib/internal/fetch/blockchains/internal/blockchains/tezos.php
index 541e514..5119385 100644
--- a/container/src/finance/lib/internal/fetch/blockchains/internal/blockchains/tezos.php
+++ b/container/src/finance/lib/internal/fetch/blockchains/internal/blockchains/tezos.php
@@ -285,7 +285,7 @@ namespace docker_finance\blockchains\internal\blockchains
             $this->explorer = new tezos\TzKt($env);
         }
 
-        public function fetch(internal\Metadata $metadata = null): void
+        public function fetch(internal\Metadata|null $metadata = null): void
         {
             if (is_null($metadata)) {
                 utils\CLI::throw_fatal("metadata unavailable");
diff --git a/container/src/finance/lib/internal/fetch/exchanges/internal/exchanges/gemini.php b/container/src/finance/lib/internal/fetch/exchanges/internal/exchanges/gemini.php
index 99c7f49..5107e1a 100644
--- a/container/src/finance/lib/internal/fetch/exchanges/internal/exchanges/gemini.php
+++ b/container/src/finance/lib/internal/fetch/exchanges/internal/exchanges/gemini.php
@@ -97,7 +97,7 @@ namespace docker_finance\exchanges\internal\exchanges\gemini
          * @param string $path URI path
          * @param string $api API scope
          * @param string $method HTTP method
-         * @param array<string> $params Optional parameters
+         * @param array<string, int|string> $params Optional parameters
          * @return mixed Raw requested data
          */
         protected function request(