diff --git a/bundle/src/Comms/Event/ToCore/Billing/RecordMeteredUsage.php b/bundle/src/Comms/Event/ToCore/Billing/RecordMeteredUsage.php
new file mode 100644
index 0000000..212c393
--- /dev/null
+++ b/bundle/src/Comms/Event/ToCore/Billing/RecordMeteredUsage.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace Hyvor\Internal\Bundle\Comms\Event\ToCore\Billing;
+
+use Hyvor\Internal\Bundle\Comms\Event\AbstractEvent;
+use Hyvor\Internal\Component\Component;
+
+class RecordMeteredUsage extends AbstractEvent
+{
+    public function __construct(
+        private Component $component,
+        private int $organizationId,
+        private int $amount,
+        private string $idempotencyKey,
+    ) {}
+
+    public function getComponent(): Component
+    {
+        return $this->component;
+    }
+
+    public function getOrganizationId(): int
+    {
+        return $this->organizationId;
+    }
+
+    public function getAmount(): int
+    {
+        return $this->amount;
+    }
+
+    public function getIdempotencyKey(): string
+    {
+        return $this->idempotencyKey;
+    }
+
+    public function from(): array
+    {
+        return [];
+    }
+
+    public function to(): array
+    {
+        return [Component::CORE];
+    }
+}
diff --git a/src/Billing/Billing.php b/src/Billing/Billing.php
index f5b1f20..813fa42 100644
--- a/src/Billing/Billing.php
+++ b/src/Billing/Billing.php
@@ -9,6 +9,7 @@
 use Hyvor\Internal\Component\Component;
 use Hyvor\Internal\Component\InstanceUrlResolver;
 use Hyvor\Internal\InternalConfig;
+use Hyvor\Internal\Bundle\Comms\Event\ToCore\Billing\RecordMeteredUsage;
 
 class Billing implements BillingInterface
 {
@@ -17,8 +18,7 @@ public function __construct(
         private InternalConfig $internalConfig,
         private InstanceUrlResolver $instanceUrlResolver,
         private CommsInterface $comms,
-    ) {
-    }
+    ) {}
 
     /**
      * @return array{urlNew: string, urlChange: string}
@@ -95,4 +95,25 @@ public function licenses(array $organizationIds, ?Component $component = null):
         return $response->getLicenses();
     }
 
+    /**
+     * @throws CommsApiFailedException
+     */
+    public function recordMeteredUsage(
+        int $organizationId,
+        int $amount,
+        string $idempotencyKey,
+        ?Component $component = null
+    ): void {
+        $component ??= $this->internalConfig->getComponent();
+
+        $this->comms->send(
+            new RecordMeteredUsage(
+                $component,
+                $organizationId,
+                $amount,
+                $idempotencyKey
+            ),
+            Component::CORE
+        );
+    }
 }
diff --git a/src/Billing/BillingFake.php b/src/Billing/BillingFake.php
index 6709d83..e6d9f78 100644
--- a/src/Billing/BillingFake.php
+++ b/src/Billing/BillingFake.php
@@ -15,7 +15,8 @@ class BillingFake implements BillingInterface
      * @param array<int, ResolvedLicense>|(callable(int[] $organizationIds, Component $component) : array<int, ResolvedLicense>) $licenses
      * @return void
      */
-    public static function enable(array|callable $licenses): void {
+    public static function enable(array|callable $licenses): void
+    {
         app()->singleton(Billing::class, function () use ($licenses) {
             return new BillingFake(
                 app(InternalConfig::class),
@@ -87,6 +88,26 @@ public function licenses(array $organizationIds, ?Component $component = null):
         return ($this->licenses)($organizationIds, $component);
     }
 
+    /**
+     * @var array<int, array{organizationId: int, amount: int, idempotencyKey: string, component: Component}>
+     */
+    public array $recordedUsage = [];
+
+    public function recordMeteredUsage(
+        int $organizationId,
+        int $amount,
+        string $idempotencyKey,
+        ?Component $component = null
+    ): void {
+        $component ??= $this->internalConfig->getComponent();
+
+        $this->recordedUsage[] = [
+            'organizationId' => $organizationId,
+            'amount' => $amount,
+            'idempotencyKey' => $idempotencyKey,
+            'component' => $component,
+        ];
+    }
     /**
      * @param array<int, ResolvedLicense>|(callable(int[] $organizationIds, Component $component) : array<int, ResolvedLicense>) $licenses
      */
diff --git a/src/Billing/BillingInterface.php b/src/Billing/BillingInterface.php
index 15efc2b..bb30c0f 100644
--- a/src/Billing/BillingInterface.php
+++ b/src/Billing/BillingInterface.php
@@ -19,4 +19,16 @@ public function license(int $organizationId, ?Component $component = null): Reso
      * @throws CommsApiFailedException
      */
     public function licenses(array $organizationIds, ?Component $component = null): array;
+
+    /**
+     * @param string $idempotencyKey A unique key within the component to ensure the same usage isn't recorded twice.
+     *  ex: orgId + date
+     * @throws CommsApiFailedException
+     */
+    public function recordMeteredUsage(
+        int $organizationId,
+        int $amount,
+        string $idempotencyKey,
+        ?Component $component = null
+    ): void;
 }
diff --git a/src/Billing/License/Plan/FortGuardPlan.php b/src/Billing/License/Plan/FortGuardPlan.php
index 490f7f8..a3b7905 100644
--- a/src/Billing/License/Plan/FortGuardPlan.php
+++ b/src/Billing/License/Plan/FortGuardPlan.php
@@ -11,6 +11,14 @@ class FortGuardPlan extends PlanAbstract
 {
     protected function config(): void
     {
+        // Meters
+        $this->meter(
+            name: 'base_credits',
+            nameReadable: 'Additional Usage (Base Plan)',
+            property: 'credits',
+            pricePerUnit: 0.0004, // 4 per 10,000
+        );
+
         // Version 1
         $this->version(1, function () {
             $this->plan(
@@ -21,6 +29,7 @@ protected function config(): void
                 ),
                 nameReadable: 'Base Plan',
                 monthlyOnly: true,
+                meterName: 'base_credits',
             );
         });
     }
diff --git a/src/Billing/License/Plan/Meter.php b/src/Billing/License/Plan/Meter.php
new file mode 100644
index 0000000..982cb1a
--- /dev/null
+++ b/src/Billing/License/Plan/Meter.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace Hyvor\Internal\Billing\License\Plan;
+
+class Meter
+{
+    public function __construct(
+        public string $name,
+        public string $property,
+        public string $nameReadable,
+        public float $pricePerUnit,
+    ) {}
+}
diff --git a/src/Billing/License/Plan/Plan.php b/src/Billing/License/Plan/Plan.php
index c1ba295..cc6e398 100644
--- a/src/Billing/License/Plan/Plan.php
+++ b/src/Billing/License/Plan/Plan.php
@@ -3,6 +3,7 @@
 namespace Hyvor\Internal\Billing\License\Plan;
 
 use Hyvor\Internal\Billing\License\License;
+use Hyvor\Internal\Billing\License\Plan\Meter;
 
 /**
  * @template T of License = License
@@ -38,6 +39,11 @@ public function __construct(
 
         // plan will only be available as a monthly subscription
         public bool $monthlyOnly = false,
+
+        /**
+         * Meter for usage-based billing
+         */
+        public ?Meter $meter = null,
     ) {
         $this->nameReadable = $nameReadable ?? ucfirst($this->name);
     }
diff --git a/src/Billing/License/Plan/PlanAbstract.php b/src/Billing/License/Plan/PlanAbstract.php
index 62bffbd..3bd6452 100644
--- a/src/Billing/License/Plan/PlanAbstract.php
+++ b/src/Billing/License/Plan/PlanAbstract.php
@@ -15,6 +15,11 @@ abstract class PlanAbstract
      */
     private array $versions;
 
+    /**
+     * @var array<string, Meter>
+     */
+    private array $meters = [];
+
     // this only helps with config() method. Do not use for anything else.
     private ?int $currentVersionForConfig = null;
 
@@ -50,8 +55,15 @@ protected function plan(
         ?string $group = null,
         bool $annualOnly = false,
         bool $monthlyOnly = false,
+        ?string $meterName = null,
     ): void {
         assert($this->currentVersionForConfig !== null);
+
+        $meter = $meterName ? $this->meters[$meterName] : null;
+        if ($meter) {
+            assert(property_exists($license, $meter->property));
+        }
+
         $plan = new Plan(
             $this->currentVersionForConfig,
             $name,
@@ -61,6 +73,7 @@ protected function plan(
             $group,
             $annualOnly,
             $monthlyOnly,
+            $meter,
         );
 
         $currentVersionPlans = $this->versions[$this->currentVersionForConfig];
@@ -69,6 +82,24 @@ protected function plan(
         $this->versions[$this->currentVersionForConfig] = $currentVersionPlans;
     }
 
+    protected function meter(
+        string $name,
+        string $nameReadable,
+        string $property,
+        float $pricePerUnit,
+    ): void {
+        if (isset($this->meters[$name])) {
+            throw new \Exception("Meter with name $name already exists");
+        }
+
+        $this->meters[$name] = new Meter(
+            name: $name,
+            property: $property,
+            nameReadable: $nameReadable,
+            pricePerUnit: $pricePerUnit,
+        );
+    }
+
     /**
      * @return array<int, array<string, Plan<T>>>
      */
@@ -110,4 +141,12 @@ public function tryGetPlan(string $name, ?int $version = null): ?Plan
         $version ??= $this->getCurrentVersion();
         return $this->versions[$version][$name] ?? null;
     }
+
+    /**
+     * @return array<string, Meter>
+     */
+    public function getMeters(): array
+    {
+        return $this->meters;
+    }
 }