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black-forest-labs/flux-1-dev-lora/edit

FLUX.1 Dev LoRA image editing from Black Forest Labs' FLUX.1 [dev], with up to three of your own LoRA files per request. A strength control sets how far the result moves from one source image, and a mask can limit the redraw to one area.

From $0.018/image
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Quickstart

Examples use the selected endpoint’s public parameter definitions. Replace the API key and example media, then send the request from your server.

SDKs & integrations
POSThttps://api.spicyapi.ai/api/v1/jobs/createTask

API authentication

Keep the API key in the server environment variable SPICY_API_KEY. Use Bearer authentication and Content-Type: application/json for JSON requests.

Authorization: Bearer $SPICY_API_KEY
FLUX.1 Dev LoRA · Image Editing · Sample output
Sample outputUse this example
# Generate the idempotency key once; reuse it when retrying after a lost response.
export SPICY_IDEMPOTENCY_KEY="${SPICY_IDEMPOTENCY_KEY:-$(uuidgen)}"
curl -X POST https://api.spicyapi.ai/api/v1/jobs/createTask \
  -H "Authorization: Bearer $SPICY_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $SPICY_IDEMPOTENCY_KEY" \
  -d '{
  "model": "black-forest-labs/flux-1-dev-lora/edit",
  "input": {
    "image_url": "https://example.com/reference.png",
    "output_format": "jpeg",
    "prompt": "A ceramic teapot on a linen cloth, soft window light, muted palette"
  }
}'

# Copy data.taskId from the response into TASK_ID, then poll the status.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.spicyapi.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $SPICY_API_KEY"

Generated from this model’s input schema — the same one the API validates every request against.

Input parameters

Place these fields inside the request body’s input object. Names and types match the API. Do not assume a default when none is specified.

image_urlstringRequired

The picture to edit. The result keeps its shape at about 0.7 megapixels: in our tests a 1024 x 1536 source came back as 672 x 1008.

Default
Not specified
Constraints
format:"uri"
contentMediaType:["image/jpeg","image/png","image/webp","image/gif"]
promptstringRequired

Describe the whole image you want back. With a mask, describe what should appear in the white area. Put a LoRA's trigger phrase first.

Default
Not specified
Constraints
minLength:1
maxLength:5000
seedintegerOptional

Keeps results comparable while you adjust strength or the mask; the same seed does not promise an identical image.

Default
Not specified
Constraints
minimum:0
maximum:2147483647
output_formatstringOptional

JPEG by default, PNG or WebP if you need them. Does not change the price.

Default
"jpeg"
Allowed values
"jpeg""png""webp"
stepsintegerOptional

Denoising steps, 1 to 50 (default 28). More steps take longer to generate. The price is the same at any value.

Default
28
Constraints
minimum:1
maximum:50
guidance_scalenumberOptional

How closely the result follows the prompt, 0 to 20 (default 3.5). Realism LoRAs often look more natural a little lower.

Default
3.5
Constraints
minimum:0
maximum:20
lorasarray<object>Optional

Up to three {path, scale} entries trained for FLUX.1 [dev]; scale 0 to 4, 1 is neutral. Use a public direct link to the .safetensors file.

Default
[]
Constraints
maxItems:3
strengthnumberOptional

How far to move from the source, 0 to 1 (default 0.8). With a mask, use 0.9 to 1 so the white area really changes. Without one, 0.8 keeps pose and layout, while 0.95 lets the model redraw almost everything, the face included.

Default
0.8
Constraints
minimum:0
maximum:1
mask_urlstringOptional

Optional. A black-and-white image the same size as the source: white areas are redrawn from the prompt, black areas are kept as they are. Leave it out to restyle the whole frame. Does not change the price.

Default
Not specified
Constraints
format:"uri"
contentMediaType:["image/jpeg","image/png","image/webp","image/gif"]

Track the task

HTTP 202 means the task was accepted, not completed. Save the returned taskId and query that task. Do not create another task while waiting for its result.

Accepted response
HTTP/1.1 202 Accepted
Location: /api/v1/jobs/recordInfo?taskId=job_01k3m8x9q2z4v7n5p6r8s0t1w3

{
  "code": 200,
  "msg": "success",
  "request_id": "req_example_create",
  "data": {
    "taskId": "job_01k3m8x9q2z4v7n5p6r8s0t1w3",
    "state": "queued",
    "estimatedCost": "0.750000"
  }
}

The accepted response includes the estimate so your app can show the same amount in task history and billing.

Read the job
curl --get "https://api.spicyapi.ai/api/v1/jobs/recordInfo" \
  --data-urlencode "taskId=$TASK_ID" \
  -H "Authorization: Bearer $SPICY_API_KEY"

Start polling at about 2 seconds and gradually increase the interval. Stop at a terminal state. After a connection failure, query the original taskId. Retry creation only with the original idempotency key and body.

Or let the callback find you
import { verifyWebhook } from "@spicyapi/sdk";

// express.raw keeps the bytes we signed; express.json never matches.
app.post("/hooks/spicy", express.raw({ type: "application/json" }), (req, res) => {
  const { payload } = verifyWebhook({
    rawBody: req.body,
    timestamp: req.header("X-Webhook-Timestamp"),
    signature: req.header("X-Webhook-Signature"),
    payloadVersion: Number(req.header("X-Webhook-Payload-Version")),
    secret: process.env.SPICY_WEBHOOK_SECRET,
  });
  res.status(200).end();
  void handleFinishedTask(payload);
});

Pass callBackUrl when you create the task and the finished record is POSTed to you — no polling loop at all. Every delivery carries X-Webhook-Timestamp, X-Webhook-Signature and X-Webhook-Payload-Version. The signature is a base64 HMAC-SHA256 over taskId.timestamp.sha256(body), so it must be checked against the raw bytes: parsing the JSON and re-serialising it changes them and the check will fail. Failed deliveries are retried, so the same taskId can arrive twice — make the handler idempotent. Answer 2xx first and do the work afterwards; a slow handler is treated as a failed delivery.

Read the result

Consume output only when state is succeeded. On failure, use errorCode, errorMessage and request_id to investigate. Example costs and states do not represent an actual bill.

Completed response example
{
  "code": 200,
  "msg": "success",
  "request_id": "req_example_record",
  "data": {
    "taskId": "job_01k3m8x9q2z4v7n5p6r8s0t1w3",
    "model": "black-forest-labs/flux-1-dev-lora/edit",
    "state": "succeeded",
    "output": {
      "assets": [
        {
          "key": "tasks/2026/08/28/job_01k3m8x9q2z4v7n5p6r8s0t1w3/3f7a1c9e5b2d48f0a6c1e3d5b7f9a1c3.png",
          "mime": "image/png",
          "url": "https://example.r2.cloudflarestorage.com/results/job_01k3m8x9q2z4v7n5p6r8s0t1w3/result.png?X-Amz-Signature=SIGNATURE_FROM_RESPONSE",
          "expiresAt": "2026-08-28T12:20:08.000Z"
        }
      ]
    },
    "cost": "0.750000",
    "settled": true,
    "createdAt": "2026-08-28T12:00:00Z",
    "completedAt": "2026-08-28T12:00:30Z"
  }
}

For each available asset, open or download assets[].url directly without an API Authorization header. The signed URL expires at expiresAt; poll the task again to refresh it while the asset remains within its retention period. A pending or unavailable asset has no URL. Treat signed URLs as private.

SDKs & integrations

Use SpicyAPI in your app, terminal, AI assistant or visual workflow. Choose a setup guide below.

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Self-hosted community nodes and importable HTTP Request templates for n8n Cloud.
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Image, video and audio workflows on a node canvas.

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Use it in ComfyUI

Install the SpicyAPI nodes from ComfyUI Manager or with the command below, then search for FLUX.1 Dev LoRA · Image Editing on the canvas. The node has the same options as this page and shows its price before it runs.

cd ComfyUI/custom_nodes
git clone https://github.com/spicyapi-ai/comfyui-spicyapi
Workflow examplesSetup guideSource on GitHub