> ## Documentation Index
> Fetch the complete documentation index at: https://docs.runcomfy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Pricing

Serverless API (ComfyUI) offers flexible, pay-per-use pricing with no upfront costs.

Unlike the **Model API** (per-request pricing), Serverless API pricing is based on **GPU instance uptime** for your deployments (billed per second).

***

## Pricing overview

Serverless API (ComfyUI) supports two billing plans:

* **Pay as You Go**: standard hourly rates by machine tier
* **Pro (subscription)**: **20%–30%** discount on Pay as You Go rates

Prices and machine availability may change. Refer to [RunComfy Pricing](https://www.runcomfy.com/pricing) for the latest machine rates, plan benefits, and extras.

| Machine Type  | GPU Options | VRAM  | RAM   | vCPUs | Pay as You Go Price | Pro Price   |
| ------------- | ----------- | ----- | ----- | ----- | ------------------- | ----------- |
| Medium        | T4, A4000   | 16GB  | 16GB  | 8     | \$0.99/hour         | \$0.79/hour |
| Large         | A10G, A5000 | 24GB  | 32GB  | 8     | \$1.75/hour         | \$1.39/hour |
| X-Large       | A6000       | 48GB  | 48GB  | 28    | \$2.50/hour         | \$1.99/hour |
| X-Large Plus  | L40S, L40   | 48GB  | 64GB  | 28    | \$2.99/hour         | \$2.15/hour |
| 2X-Large      | A100        | 80GB  | 96GB  | 28    | \$4.99/hour         | \$3.99/hour |
| 2X-Large Plus | H100        | 80GB  | 180GB | 28    | \$7.49/hour         | \$5.99/hour |
| 3X-Large      | H200        | 141GB | 240GB | 24    | \$8.75/hour         | \$6.99/hour |

***

## How billing works

Billing is usage-based and calculated **per second**:

* Billing starts when an instance is signaled to wake up (cold start + initialization).
* Billing stops when the instance is fully shut down.

Your deployment can run a mix of persistent and on-demand instances, controlled by:

* `min_instances` / `max_instances` (autoscaling bounds)
* `keep_warm_duration_in_seconds` (how long to keep idle instances warm)

See also: **[Creating a Deployment](/serverless/create-a-deployment)**

### Persistent instances

* Set `min_instances > 0` to keep that many instances running.
* You are billed for the full uptime (including idle time) until you scale down.

### On-demand instances

* Additional instances spin up to handle demand above `min_instances` (or all demand when `min_instances = 0`).
* Instances scale down after the keep-warm period.
* You are billed for cold start, execution, and keep-warm time.

***

## Instance cost breakdown

* **Cold start**: instance boots and loads models/assets. Duration depends on machine tier, workflow complexity, and model size.
* **Execution time**: workflows run. This is the main compute time.
* **Keep-warm time**: idle time before scale-down. This time is billed.

> **Note:** You may also see **Queue Time** (waiting for resources or concurrency). Queue time is **not** billed.

***

## Support

If you believe you’ve been incorrectly billed, contact us at [**hi@runcomfy.com**](mailto:hi@runcomfy.com) with your `deployment_id`, the `request_id` (if applicable), and the approximate time of the issue.