Flux Krea Dev LoRA API Documentation

Flux Krea Dev LoRA API Documentation

Playground

FLUX.1 Krea [dev] is the open-weights Krea 1 model with LoRA support, delivering distinctive, realistic outputs for creative projects. Ready-to-use REST API, best performance, no coldstarts, affordable pricing.

Features

FLUX Krea Dev LoRA is a versatile text-to-image and image-to-image generation model with full LoRA support. Generate stunning images with custom styles, apply artistic effects, or transform existing images — all with fine-tuned control over the output.

Why It Stands Out

• Dual mode support: Works as both text-to-image and image-to-image generator.
• LoRA support: Apply custom LoRA models for specific styles, characters, or aesthetics.
• Prompt Enhancer: Built-in AI-powered prompt optimization for better results.
• Flexible resolution: Customize width and height independently for any aspect ratio.
• Fine-tuned control: Adjust strength, guidance scale for precise results.
• Multiple output formats: Export as JPEG or PNG based on your needs.
• Affordable pricing: High-quality generation at just $0.02 per image.
• Reproducibility: Use the seed parameter to recreate exact results.

Parameters

How to Use

Text-to-Image:

1. Write a prompt describing the image you want. Use the Prompt Enhancer for AI-assisted optimization.
2. Set dimensions — adjust width and height for your desired aspect ratio.
3. Add LoRAs (optional) — apply custom style models.
4. Click Run and download your image.

Image-to-Image:

1. Upload a source image.
2. Write a prompt describing the transformation.
3. Adjust strength — lower values preserve more of the original.
4. Add LoRAs (optional) for style transfer.
5. Click Run and download your image.

Best Use Cases

• Portrait Photography — Generate photorealistic portraits with custom styles.
• Style Transfer — Apply LoRA styles to existing images.
• Creative Projects — Generate unique images with specific aesthetics.
• Character Consistency — Use LoRAs for consistent character appearances.
• Product Visualization — Create stylized product concepts.

Pricing

Pro Tips for Best Quality

• Be detailed in your prompt — include subject, style, lighting, mood, and technical details.
• Use LoRAs to apply consistent styles across multiple generations.
• For image-to-image, use lower strength (0.3–0.5) to preserve more of the original.
• Use higher strength (0.7–0.9) for more dramatic transformations.
• Fix the seed when iterating to compare different LoRA or parameter combinations.

Notes

• Ensure uploaded image URLs are publicly accessible.
• Processing time varies based on resolution and current queue load.
• Please ensure your prompts comply with content guidelines.

Authentication

For authentication details, please refer to the Authentication Guide.

API Endpoints

Submit Task & Query Result

set -euo pipefail

export WAVESPEED_API_KEY="your-api-key"

REQUEST_BODY=$(cat <<'JSON'
{
  "prompt": "A cinematic ocean wave at sunrise, highly detailed",
  "size": "1024*1024",
  "strength": 0.8,
  "guidance_scale": 3.5,
  "seed": -1,
  "output_format": "jpeg"
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/flux-krea-dev-lora" \
  -H "Authorization: Bearer ${WAVESPEED_API_KEY}" \
  -H "Content-Type: application/json" \
  -d "${REQUEST_BODY}")

TASK=$(printf '%s' "${SUBMIT_RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
PREDICTION_ID=$(printf '%s' "${TASK}" | jq -r '.id // empty')
if [ -z "${PREDICTION_ID}" ]; then
  printf 'Submission response did not contain a prediction id
' >&2
  exit 1
fi
RESULT_URL=$(printf '%s' "${TASK}" | jq -r '.urls.get // empty')
if [ -z "${RESULT_URL}" ]; then RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/${PREDICTION_ID}/result"; fi

# 2. Poll until the prediction finishes.
while true; do
  RESPONSE=$(curl --silent --show-error --fail-with-body \
    "${RESULT_URL}" \
    -H "Authorization: Bearer ${WAVESPEED_API_KEY}")
  RESULT=$(printf '%s' "${RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
  STATUS=$(printf '%s' "${RESULT}" | jq -r '.status // empty')

  case "${STATUS}" in
    completed) printf '%s\n' "${RESULT}" | jq '.outputs'; break ;;
    failed|cancelled|timeout) printf '%s\n' "${RESULT}" | jq . >&2; exit 1 ;;
    created|processing) sleep 2 ;;
    *) printf 'Unexpected status: %s
' "${STATUS}" >&2; exit 1 ;;
  esac
done

Parameters

Task Submission Parameters

Request Parameters

Response Parameters

Result Request Parameters

Result Response Parameters