[ZeroGPU] Update the documentation (#2348)

* ZeroGPU: update the documentation

* Update docs/hub/spaces-zerogpu.md

Co-authored-by: Pierric Cistac <Pierrci@users.noreply.github.com>

---------

Co-authored-by: Pierric Cistac <Pierrci@users.noreply.github.com>

Author: SBrandeis

docs/hub/billing.md

@@ -28,7 +28,7 @@ The PRO subscription unlocks essential features for serious users, including:
 - Higher [storage capacity](./storage-limits) for public and private repositories
 - Higher bandwidth and API [rate limits](./rate-limits)
 - Included credits for [Inference Providers](/docs/inference-providers/)
-- Higher tier for ZeroGPU Spaces usage
+- Higher tier for ZeroGPU Spaces usage, and pay-as-you-go quota extension
 - Ability to create ZeroGPU Spaces and use Dev Mode
 - Ability to publish Social Posts and Community Blogs
 - Leverage the [Data Studio](./data-studio) on private datasets

docs/hub/enterprise.md

@@ -39,21 +39,21 @@ Team & Enterprise organization plans add advanced capabilities to organizations,
 | Scale deployment with Inference Endpoints                                                                              | ✅ PAYG | ✅ PAYG                           | ✅ PAYG                           | ✅ PAYG                           |
 | Hub credits\* included in plan                                                                                         | ❌      | ❌ (bulk purchase available)      | $2k included                      | 5% of ACV included                |
 
-\* Hub credits can be utilized for inference providers, inference endpoints, Jobs, Space upgrade
+\* Hub credits can be utilized for inference providers, inference endpoints, Jobs, Space upgrade, ZeroGPU quota extension
 
 ### Spaces & Jobs
 
 | Feature                                | Free      | Team        | Enterprise  | Enterprise Plus |
 | -------------------------------------- | --------- | ----------- | ----------- | --------------- |
 | Spaces – CPU-based runtime             | 8 units\* | ✅ No limit | ✅ No limit | ✅ No limit     |
-| Spaces – ZeroGPU usage tiers           | 3.5 min†  | 25 min      | 45 min      | 45 min          |
+| Spaces – ZeroGPU usage tiers           | 3.5 min†  | 25 min†     | 45 min†     | 45 min†         |
 | Spaces – Upgraded hardware             | PAYG      | PAYG        | PAYG        | PAYG            |
 | Dev Mode / Custom domain for Spaces    | ❌        | ✅          | ✅          | ✅              |
 | Jobs & Scripts (train/fine-tune, eval) | PAYG      | PAYG        | PAYG        | PAYG            |
 
 \* running at the same time
 
-† daily quota
+† included daily quota; paid plans can extend beyond quota using credits at $1 per 10 min of GPU time
 
 ### Repo rules, access control, visibility
 

docs/hub/pro.md

@@ -5,7 +5,7 @@ The PRO subscription unlocks essential features for serious users, including:
 - Higher [storage capacity](./storage-limits) for public and private repositories
 - Higher bandwidth and API [rate limits](./rate-limits)
 - Included credits for [Inference Providers](/docs/inference-providers/)
-- Higher tier for [ZeroGPU Spaces](./spaces-zerogpu) usage
+- Higher tier for [ZeroGPU Spaces](./spaces-zerogpu) usage, and pay-as-you-go quota extension
 - Ability to create ZeroGPU Spaces and use [Dev Mode](./spaces-dev-mode)
 - Ability to publish Social Posts and Community Blogs
 - Leverage the [Data Studio](./data-studio) on private datasets

docs/hub/spaces-api-endpoints.md

@@ -225,16 +225,18 @@ The `Authorization` header is required for private Spaces and gives better rate
 
 ZeroGPU Spaces have usage quotas based on your account type:
 
-| Account Type | Daily GPU Quota |
-|-------------|----------------|
+| Account Type | Included Daily GPU Quota |
+|-------------|--------------------------|
 | Unauthenticated | 2 minutes |
 | Free account | 3.5 minutes |
 | PRO account | 25 minutes |
 
 When you authenticate with your token, your account's GPU quota is consumed. Unauthenticated requests use a shared pool with stricter limits.
 
+PRO, Team, and Enterprise users can go beyond their included daily quota using pre-paid credits at the rate of **$1 per 10 minutes** of GPU time.
+
 > [!TIP]
-> You can [subscribe to PRO](https://huggingface.co/subscribe/pro) for 25 minutes of daily GPU quota and higher queue priority.
+> You can [subscribe to PRO](https://huggingface.co/subscribe/pro) for 25 minutes of daily GPU quota, higher queue priority, and the ability to extend your quota with credits.
 
 ## Common patterns
 

docs/hub/spaces-zerogpu.md

@@ -13,7 +13,7 @@ Unlike traditional single-GPU allocations, ZeroGPU's efficient system lowers bar
 
 - **Using existing ZeroGPU Spaces**
   - ZeroGPU Spaces are available to use for free to all users. (Visit [the curated list](https://huggingface.co/spaces/enzostvs/zero-gpu-spaces)).
-  - [PRO users](https://huggingface.co/subscribe/pro) get x7 more daily usage quota and highest priority in GPU queues when using any ZeroGPU Spaces.
+  - [PRO users](https://huggingface.co/subscribe/pro) get x7 more daily usage quota, highest priority in GPU queues, and can go beyond their daily quota using pre-paid credits when using any ZeroGPU Spaces.
 - **Hosting your own ZeroGPU Spaces**
   - Personal accounts: [Subscribe to PRO](https://huggingface.co/settings/billing/subscription) to access ZeroGPU in the hardware options when creating a new Gradio SDK Space.
   - Organizations: [Subscribe to a Team or Enterprise plan](https://huggingface.co/enterprise) to enable ZeroGPU Spaces for all organization members.
@@ -150,19 +150,26 @@ Check out this [blogpost](https://huggingface.co/blog/zerogpu-aoti) for a comple
 
 GPU usage is subject to **daily** quotas, per account tier:
 
-| Account type                   | Daily GPU quota  | Queue priority  |
-| ------------------------------ | ---------------- | --------------- |
-| Unauthenticated                | 2 minutes        | Low             |
-| Free account                   | 3.5 minutes      | Medium          |
-| PRO account                    | 25 minutes       | Highest         |
-| Team organization member       | 25 minutes       | Highest         |
-| Enterprise organization member | 45 minutes       | Highest         |
+| Account type                   | Included daily GPU quota | Queue priority  |
+| ------------------------------ | ------------------------ | --------------- |
+| Unauthenticated                | 2 minutes                | Low             |
+| Free account                   | 3.5 minutes              | Medium          |
+| PRO account                    | 25 minutes (extensible)  | Highest         |
+| Team organization member       | 25 minutes (extensible)  | Highest         |
+| Enterprise organization member | 45 minutes (extensible)  | Highest         |
 
-Quota resets exactly 24 hours after your first GPU usage.
+Included daily quota resets exactly 24 hours after your first GPU usage.
 
 > [!NOTE]
 > Remaining quota directly impacts priority in ZeroGPU queues.
 
+### Extending quota with credits
+
+PRO, Team, and Enterprise users can continue using ZeroGPU Spaces beyond their included daily quota by consuming pre-paid credits at the rate of **$1 per 10 minutes** of GPU time.
+Once your daily quota is exhausted, any additional GPU usage is automatically billed against your credit balance.
+
+You can add credits from your [billing settings](https://huggingface.co/settings/billing).
+
 ## Hosting Limitations
 
 - **Personal accounts ([PRO subscribers](https://huggingface.co/subscribe/pro))**: Maximum of 10 ZeroGPU Spaces.