Name: lucataco Flux Watercolor Style Image Generator API
Brand: magicapi
SKU: api-magicapi-watercolor-style-image-generator-lucataco-flux-watercolor
Availability: InStock
Author: API Market

Shashank Agarwal

# 🎨 Watercolor Style Image Generator API (lucataco Flux Watercolor)

## Overview
Flux Watercolor is a FLUX LoRA by lucataco that generates images in a watercolor painting style. Its developer describes it as a FLUX LoRA trained on watercolor style photos. The style is triggered by the word `TOK` in the prompt, for example "a boat in the style of TOK".

Send a text `prompt` to generate up to 4 images. You can also pass an input `image` for image-to-image generation, or an `image` plus a `mask` for inpainting. Each request returns a list of image URLs.

## Features
- **Watercolor style**: include the trigger word `TOK` in the prompt to apply the trained style.
- **Two base models**: `dev` (default, best around 28 steps) or `schnell` (needs about 4 steps).
- **Image-to-image and inpainting**: pass `image` (and optionally `mask`); `prompt_strength` controls how much of the input image is replaced.
- **Aspect ratios**: `1:1` (default), `16:9`, `21:9`, `3:2`, `2:3`, `4:5`, `5:4`, `3:4`, `4:3`, `9:16`, `9:21`, or `custom` with `width` and `height` (256 to 1440).
- **Multiple outputs**: `num_outputs` from 1 to 4.
- **LoRA strength**: `lora_scale` for the watercolor LoRA, plus an optional `extra_lora` with its own `extra_lora_scale`.
- **Output formats**: `webp` (default), `jpg` or `png`, with `output_quality` from 0 to 100.
- **Seed**: set `seed` to reproduce a result.

## Use Cases
1. **Watercolor illustrations**: scenes, objects and landscapes in a painted watercolor look.
2. **Cards and prints**: artwork for greeting cards, invitations and posters.
3. **Blog and book images**: soft illustrated headers and chapter images.
4. **Restyling images**: turn an existing picture into a watercolor style image with image-to-image mode.

## Visual Examples
### Example Input
Prompt: `a boat in the style of TOK`

Settings: `model` `dev`, `num_outputs` 1, `aspect_ratio` `1:1`, `num_inference_steps` 28, `guidance_scale` 3.5, `lora_scale` 1, `output_format` `webp`, `output_quality` 80.

### Example Output
![Flux Watercolor output: a watercolor style painting of a boat](https://blog.api.market/wp-content/uploads/2026/10/flux-watercolor-output-73w9f1ze-api-market.webp)

## Input Parameters
| Field | Type | Required | Default | Allowed values | Description |
| --- | --- | --- | --- | --- | --- |
| `prompt` | string | Yes |  |  | Prompt for the generated image. Include the trigger word `TOK` to activate the trained watercolor style. |
| `image` | string (URL) | No | none |  | Input image (jpeg, png, gif or webp) for image-to-image or inpainting mode. If provided, `aspect_ratio`, `width` and `height` are ignored. |
| `mask` | string (URL) | No | none |  | Image mask for inpainting mode. If provided, `aspect_ratio`, `width` and `height` are ignored. |
| `aspect_ratio` | string | No | `1:1` | `1:1`, `16:9`, `21:9`, `3:2`, `2:3`, `4:5`, `5:4`, `3:4`, `4:3`, `9:16`, `9:21`, `custom` | Aspect ratio of the generated image. `custom` uses `width` and `height` and runs in bf16 mode. |
| `height` | integer | No | none | 256 to 1440 | Height of the generated image. Only used when `aspect_ratio` is `custom`. Rounded to the nearest multiple of 16. Not compatible with `go_fast`. |
| `width` | integer | No | none | 256 to 1440 | Width of the generated image. Only used when `aspect_ratio` is `custom`. Rounded to the nearest multiple of 16. Not compatible with `go_fast`. |
| `prompt_strength` | number | No | `0.8` | 0 to 1 | Prompt strength in image-to-image mode. 1.0 fully replaces the information in the input image. |
| `model` | string | No | `dev` | `dev`, `schnell` | Base model. `dev` works best with about 28 steps, `schnell` needs only 4. |
| `num_outputs` | integer | No | `1` | 1 to 4 | Number of images to generate. |
| `num_inference_steps` | integer | No | `28` | 1 to 50 | Number of denoising steps. More steps can give more detail but take longer. |
| `guidance_scale` | number | No | `3` | 0 to 10 | Guidance scale. Lower values can give more realistic images. Good values to try are 2, 2.5, 3 and 3.5. |
| `seed` | integer | No | none |  | Random seed for reproducible generation. |
| `output_format` | string | No | `webp` | `webp`, `jpg`, `png` | Format of the output images. |
| `output_quality` | integer | No | `80` | 0 to 100 | Quality of saved images. 100 is best. Not used for `png`. |
| `disable_safety_checker` | boolean | No | `false` |  | Disable the safety checker for generated images. |
| `go_fast` | boolean | No | `false` |  | Run a speed-optimized (fp8 quantized) model. Set to `false` to run in the original bf16. |
| `megapixels` | string | No | `1` | `1`, `0.25` | Approximate number of megapixels of the generated image. |
| `lora_scale` | number | No | `1` | -1 to 3 | How strongly the watercolor LoRA is applied. Values between 0 and 1 work for standard inference; with `go_fast` a 1.5x multiplier is applied. |
| `extra_lora` | string | No | none |  | Extra LoRA weights to load: a Hugging Face model, a CivitAI model or a direct `.safetensors` file URL. |
| `extra_lora_scale` | number | No | `1` | -1 to 3 | How strongly the extra LoRA is applied. Values between 0 and 1 work for standard inference; with `go_fast` a 1.5x multiplier is applied. |

## Pricing
- **Pay As You Go (PAYG) pricing**: you only pay for what you use.
- **Price**: $0.046 per API unit.
- **1 API unit = 1 request with up to 24 seconds of processing.** A request that runs longer is billed one more unit for each started 24-second block (for example, more than 24 and up to 48 seconds of processing is 2 units, $0.092).
- Settings that add work, such as more `num_outputs` or more `num_inference_steps`, take longer and can use more units.
- **Example cost**: the example request (1 image at 28 steps) took 13.4 seconds of processing, which fits in one 24-second block: 1 API unit, $0.046.
- **Failed or cancelled predictions are not billed.**
- **GET requests to check prediction status** are free and don't count toward API unit usage.
- **No monthly subscription fee.**

## API Documentation

### Base URL
All API requests go to: `https://prod.api.market/api/v1/magicapi/watercolor-style-image-generator-lucataco-flux-watercolor`

### Authentication
Send your api.market API key in the `x-api-market-key` header:
```
x-api-market-key: YOUR_API_MARKET_KEY
```

### Asynchronous Processing
**IMPORTANT**: This API is asynchronous. The flow is:
1. Send a POST request to `/predictions`. A successful request returns **201 Created** with a prediction `id` and a `status` of `starting` or `processing`.
2. Poll GET `/predictions/{id}` with that ID.
3. Keep polling while `status` is `starting` or `processing`.
4. Stop when `status` is `succeeded` (read `output`), `failed` or `canceled` (read `error`).

A polling interval of 1 second and an overall timeout of 600 seconds (10 minutes) work well.

### Endpoints

#### Create a Prediction
```bash
curl -X POST "https://prod.api.market/api/v1/magicapi/watercolor-style-image-generator-lucataco-flux-watercolor/predictions" \
  -H "Content-Type: application/json" \
  -H "x-api-market-key: YOUR_API_MARKET_KEY" \
  -d '{
    "version": "846d1eb37059ed2ed268ff8dd4aa1531487fcdc3425a7a44c2a0a10723ef8383",
    "input": {
      "model": "dev",
      "prompt": "a boat in the style of TOK",
      "lora_scale": 1,
      "num_outputs": 1,
      "aspect_ratio": "1:1",
      "output_format": "webp",
      "guidance_scale": 3.5,
      "output_quality": 80,
      "num_inference_steps": 28
    }
  }'
```

Response (201 Created):
```json
{
  "id": "73w9f1zewdrmr0d1f1kvwdxghc",
  "version": "846d1eb37059ed2ed268ff8dd4aa1531487fcdc3425a7a44c2a0a10723ef8383",
  "status": "starting",
  "created_at": "2026-10-26T13:30:39.881Z"
}
```

#### Check Prediction Status
```bash
curl -X GET "https://prod.api.market/api/v1/magicapi/watercolor-style-image-generator-lucataco-flux-watercolor/predictions/{id}" \
  -H "x-api-market-key: YOUR_API_MARKET_KEY"
```

Response when the prediction has finished (200 OK):
```json
{
  "id": "73w9f1zewdrmr0d1f1kvwdxghc",
  "status": "succeeded",
  "output": [
    "https://blog.api.market/wp-content/uploads/2026/10/flux-watercolor-output-73w9f1ze-api-market.webp"
  ],
  "error": null,
  "created_at": "2026-10-26T13:30:39.881Z",
  "started_at": "2026-10-26T13:30:39.975Z",
  "completed_at": "2026-10-26T13:30:53.419Z"
}
```

`output` is a list of image URLs, one per requested output (`num_outputs`).

### Status Codes
- **201 Created**: prediction created (POST `/predictions`). This is the normal success response.
- **200 OK**: prediction details returned (GET `/predictions/{id}`).
- **400 Bad Request**: invalid input, for example a missing `prompt` or an `aspect_ratio` that is not in the list.
- **401 Unauthorized**: missing or invalid API key.
- **404 Not Found**: no prediction with that ID.
- **429 Too Many Requests**: rate limit exceeded.
- **500 Internal Server Error** or **503 Service Unavailable**: temporary server problem; retry later.

## Rate Limits
Requests are rate limited to keep usage fair. If you receive a 429 response, wait and retry with exponential backoff.

## Error Handling
- Check the HTTP status code of every request and read the response body for the error message.
- A prediction can also end with `status` set to `failed`; the `error` field then explains why. Failed predictions are not billed.
- Retry 429, 500 and 503 responses with exponential backoff. Fix the input before retrying a 400.

## Implementation Guide
### Example Code

#### JavaScript
```javascript
const apiKey = "YOUR_API_MARKET_KEY";
const baseUrl = "https://prod.api.market/api/v1/magicapi/watercolor-style-image-generator-lucataco-flux-watercolor";

async function createAndWaitForPrediction(input) {
  const response = await fetch(`${baseUrl}/predictions`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "x-api-market-key": apiKey
    },
    body: JSON.stringify({ version: "846d1eb37059ed2ed268ff8dd4aa1531487fcdc3425a7a44c2a0a10723ef8383", input })
  });

  if (response.status !== 201) {
    throw new Error(`API error: ${response.status} ${await response.text()}`);
  }

  const prediction = await response.json();
  return pollForResults(prediction.id);
}

const delay = (ms) => new Promise((resolve) => setTimeout(resolve, ms));

async function pollForResults(predictionId) {
  const maxTimeout = 600000;
  const pollInterval = 1000;
  const startTime = Date.now();

  while (Date.now() - startTime < maxTimeout) {
    const response = await fetch(`${baseUrl}/predictions/${predictionId}`, {
      headers: { "x-api-market-key": apiKey }
    });

    if (!response.ok) {
      throw new Error(`API error: ${response.status} ${await response.text()}`);
    }

    const prediction = await response.json();

    if (prediction.status === "succeeded") {
      return prediction.output;
    }

    if (prediction.status === "failed" || prediction.status === "canceled") {
      throw new Error(`Prediction ${prediction.status}: ${prediction.error || "Unknown error"}`);
    }

    await delay(pollInterval);
  }

  throw new Error("Prediction timed out after 10 minutes");
}

createAndWaitForPrediction({
  "model": "dev",
  "prompt": "a boat in the style of TOK",
  "lora_scale": 1,
  "num_outputs": 1,
  "aspect_ratio": "1:1",
  "output_format": "webp",
  "guidance_scale": 3.5,
  "output_quality": 80,
  "num_inference_steps": 28
}).then((output) => console.log(output));
```

#### Python
```python
import time
import requests

API_KEY = "YOUR_API_MARKET_KEY"
BASE_URL = "https://prod.api.market/api/v1/magicapi/watercolor-style-image-generator-lucataco-flux-watercolor"


def create_and_wait_for_prediction(input_data):
    headers = {"Content-Type": "application/json", "x-api-market-key": API_KEY}
    response = requests.post(
        f"{BASE_URL}/predictions",
        headers=headers,
        json={"version": "846d1eb37059ed2ed268ff8dd4aa1531487fcdc3425a7a44c2a0a10723ef8383", "input": input_data},
    )

    if response.status_code != 201:
        raise Exception(f"API error: {response.status_code} {response.text}")

    return poll_for_results(response.json()["id"])


def poll_for_results(prediction_id):
    max_timeout = 600
    poll_interval = 1
    headers = {"x-api-market-key": API_KEY}
    start_time = time.time()

    while time.time() - start_time < max_timeout:
        response = requests.get(f"{BASE_URL}/predictions/{prediction_id}", headers=headers)

        if response.status_code != 200:
            raise Exception(f"API error: {response.status_code} {response.text}")

        prediction = response.json()

        if prediction["status"] == "succeeded":
            return prediction["output"]

        if prediction["status"] in ("failed", "canceled"):
            raise Exception(f"Prediction {prediction['status']}: {prediction.get('error') or 'Unknown error'}")

        time.sleep(poll_interval)

    raise Exception("Prediction timed out after 10 minutes")


print(create_and_wait_for_prediction({
    "model": "dev",
    "prompt": "a boat in the style of TOK",
    "lora_scale": 1,
    "num_outputs": 1,
    "aspect_ratio": "1:1",
    "output_format": "webp",
    "guidance_scale": 3.5,
    "output_quality": 80,
    "num_inference_steps": 28
}))
```

## FAQ
- **How do I get the watercolor style?**
  - Add the trigger word to your prompt, for example "a boat in the style of TOK". Raise or lower `lora_scale` to make the style stronger or weaker.
- **Should I use `dev` or `schnell`?**
  - `dev` (default) works best with about 28 `num_inference_steps`. `schnell` needs only about 4 steps, so it finishes faster and uses fewer API units.
- **Can I restyle an existing image?**
  - Yes. Pass it as `image` and set `prompt_strength` (default 0.8; 1.0 replaces the input entirely). Add a `mask` to repaint only part of the image.
- **How many images does one request return?**
  - Between 1 and 4, set by `num_outputs`. More images take longer to generate, so a request can use more than one 24-second API unit ($0.046 each).
- **Is the 201 response from POST an error?**
  - No. 201 Created means the prediction was accepted. Use the returned `id` to poll GET `/predictions/{id}` until `status` is `succeeded`, `failed` or `canceled`.
- **What if my prediction fails?**
  - Failed predictions are not billed. Read the `error` field, adjust the input and try again.

## Contact Us
If you have any questions or need assistance, you can reach out to us through the embedded chat on the bottom right corner of the page or send an email to hello@magicapi.com.


Generate watercolor style images from text or an input image with lucataco's Flux Watercolor FLUX LoRA. $0.046 per request, pay as you go.