# Stable Diffusion v3 text to image fal AI medium

Needs prompt.

Stable Diffusion V3, served by fal.ai. $0.035 per images One submitted item is offered per call; the exact receipt determines the final charge. Asynchronous: returns a request_id; poll fal/status and fetch fal/result with model "fal-ai/stable-diffusion-v3-medium" and that request_id. The exact endpoint/request billing receipt is required before settlement.

- Tool ID: `fal/fal-ai-stable-diffusion-v3-medium`
- Name in the catalog: Stable Diffusion V3, text to image
- Provider: [fal.ai](/providers/fal.md)
- Capability: [AI image generation](/tools/image-generation.md)
- Price: $0.035 per call
- Authentication: an authorised Agentik workspace is required for execution, including zero-price tools.

## Pricing contract

The provider’s price, with no markup. Billed for measured usage.


```json
{
  "model": "per_call",
  "amountUsd": 0.035
}
```

Pricing source: [https://fal.ai/models/fal-ai/stable-diffusion-v3-medium/llms.txt](https://fal.ai/models/fal-ai/stable-diffusion-v3-medium/llms.txt). $0.035 per images One submitted item is offered per call; the exact receipt determines the final charge..

Price verification date: 2026-11-03.

## Complete input schema


```json
{
  "type": "object",
  "properties": {
    "num_images": {
      "description": "The number of images to generate.",
      "title": "Num Images",
      "type": "integer",
      "maximum": 1,
      "minimum": 1,
      "default": 1,
      "enum": [
        1
      ]
    },
    "seed": {
      "description": "\n            The same seed and the same prompt given to the same version of Stable Diffusion\n            will output the same image every time.\n        ",
      "anyOf": [
        {
          "type": "integer"
        },
        {
          "type": "null"
        }
      ],
      "title": "Seed"
    },
    "guidance_scale": {
      "description": "\n            The CFG (Classifier Free Guidance) scale is a measure of how close you want\n            the model to stick to your prompt when looking for a related image to show you.\n        ",
      "title": "Guidance scale (CFG)",
      "type": "number",
      "maximum": 20,
      "minimum": 0,
      "default": 5
    },
    "negative_prompt": {
      "title": "Negative Prompt",
      "type": "string",
      "description": "The negative prompt to generate an image from.",
      "default": ""
    },
    "prompt": {
      "title": "Prompt",
      "type": "string",
      "description": "The prompt to generate an image from."
    },
    "image_size": {
      "title": "Image Size",
      "anyOf": [
        {
          "x-fal-order-properties": [
            "width",
            "height"
          ],
          "properties": {
            "height": {
              "description": "The height of the generated image.",
              "title": "Height",
              "type": "integer",
              "exclusiveMinimum": 0,
              "maximum": 14142,
              "default": 512
            },
            "width": {
              "description": "The width of the generated image.",
              "title": "Width",
              "type": "integer",
              "exclusiveMinimum": 0,
              "maximum": 14142,
              "default": 512
            }
          },
          "title": "ImageSize",
          "type": "object"
        },
        {
          "enum": [
            "square_hd",
            "square",
            "portrait_4_3",
            "portrait_16_9",
            "landscape_4_3",
            "landscape_16_9"
          ],
          "type": "string"
        }
      ],
      "description": "The size of the generated image.",
      "default": "square_hd"
    },
    "enable_safety_checker": {
      "title": "Enable Safety Checker",
      "type": "boolean",
      "description": "If set to true, the safety checker will be enabled. Disabling it requires account authorization; unauthorized requests are always checked, and images flagged as unsafe are returned as black images.",
      "default": true
    },
    "num_inference_steps": {
      "description": "The number of inference steps to perform.",
      "title": "Num Inference Steps",
      "type": "integer",
      "maximum": 50,
      "minimum": 1,
      "default": 28,
      "enum": [
        28
      ]
    },
    "prompt_expansion": {
      "title": "Enhance Prompt",
      "type": "boolean",
      "description": "If set to true, prompt will be upsampled with more details.",
      "default": false,
      "enum": [
        false
      ]
    }
  },
  "required": [
    "prompt"
  ],
  "additionalProperties": false
}
```

## Published example

This is the provider tool’s published example. Replace example values with the user’s requested inputs, respecting the schema; do not execute an example merely to test a connection.


```json
{
  "tool_id": "fal/fal-ai-stable-diffusion-v3-medium",
  "input": {
    "prompt": "Digital art, portrait of an anthropomorphic roaring Tiger warrior with full armor, close up in the middle of a battle, behind him there is a banner with the text \"Open Source\"",
    "num_images": 1,
    "num_inference_steps": 28,
    "prompt_expansion": false,
    "guidance_scale": 5,
    "negative_prompt": "",
    "image_size": "square_hd",
    "enable_safety_checker": true
  }
}
```

## Execute and retrieve

Inspect again before execution, explain the price and obtain the required authority. Use MCP run_tool or POST /v1/run with this tool ID, valid input and an idempotency key. Save the returned run ID and follow the actual state. If Agentik answers that the tool is temporarily unavailable, do not retry it blindly; use discovery to propose an alternative.

This tool uses deferred settlement. Follow its returned task/run instructions; preserve the existing reservation until the result is reconciled.

A partial or uncertain result can still have consumed provider resources. Consult [billing](/docs/billing.md), [idempotency](/docs/idempotency.md) and [asynchronous results](/docs/async.md).

[Provider documentation](https://fal.ai/models/fal-ai/stable-diffusion-v3-medium)

[REST inspection](https://api.agentik.cc/v1/tools/fal/fal-ai-stable-diffusion-v3-medium) · [OpenAPI](/openapi.json) · [Connection guide](/connect.md)

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[HTML page](/providers/fal/fal-ai-stable-diffusion-v3-medium) · [Agent index](/llms.txt)