black-forest-labs/flux-2-klein-4b-lora/edit4 积分起 /张· 编辑图片

FLUX.2 Klein 4B LoRA 运行 Black Forest Labs 小巧的开源 FLUX.2 Klein 4B,可加载最多三个你自己的 LoRA 文件,大约四秒出图。文生图有九种比例,最大 2048 像素,改图最多用三张原图。

在 POST /jobs/createTask 里把模型名写成 black-forest-labs/flux-2-klein-4b-lora/edit 即可调用,4 积分/张起(US$0.04)。新账户送 30 积分,可以先在 Playground 里免费试。

  • 生成图片
  • 编辑图片
  • 最高 2K
  • 最多 3 张参考图
  • 9 种画幅
  • 可加载自己的 LoRA
调用名black-forest-labs/flux-2-klein-4b-lora/edit
接口POST https://api.popnow.ai/api/v1/jobs/createTask
# 1. Create the task. Keep the Idempotency-Key if you retry after a network error.
export IDEMPOTENCY_KEY="$(uuidgen)"
curl -X POST https://api.popnow.ai/api/v1/jobs/createTask \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $IDEMPOTENCY_KEY" \
  -d '{
  "model": "black-forest-labs/flux-2-klein-4b-lora/edit",
  "input": {
    "prompt": "A ceramic teapot on a linen cloth, soft window light, muted palette",
    "image_urls": [
      "https://media.popnow.ai/influencer/examples/marco.webp"
    ],
    "aspect_ratio": "auto",
    "resolution": "1k"
  }
}'

# 2. Copy data.taskId from the response, then poll until state is succeeded, failed, canceled or expired.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

input 按下面的 Schema 生成,原样就能通过校验。把提示词和链接换成你自己的即可。

价格

选项积分 /张≈ 美元
标准3.06US$0.031

1 积分 = $0.01 · 全部选项及价格:GET /models/black-forest-labs/flux-2-klein-4b-lora/edit

每个任务按整数积分向上取整,所以最低档跑一次是 4 积分/张(US$0.04)。

限制

分辨率
1K · 2K
画面比例
auto · 1:1 · 16:9 · 9:16 · 4:3 · 3:4 +4
参考图
3
提示词长度(字符)
5,000
单个上传上限
10 MB

参数

这些字段来自我们校验每个请求所用的同一份 Schema。没列出的字段会被拒绝。

  • promptstring必填

    Say what to change and what must stay the same. Put a LoRA trigger phrase first.

    范围
    1 – 5000 chars
  • image_urlsarray<string>必填

    要编辑或合成的照片。在提示词里说明每张的作用。

    范围
    1 – 3 items · image/jpeg, image/png, image/webp, image/gif · ≤ 10 MB
  • aspect_ratiostring可选

    画面形状:横版、方形或竖版。

    默认值
    "auto"
    可选值
    "auto""1:1""16:9""9:16""4:3""3:4""3:2""2:3""21:9""9:21"
  • resolutionstring可选

    输出尺寸。越大越清晰,价格也越高。

    默认值
    "1k"
    可选值
    "1k""2k"
  • lorasarray<object>可选

    加载你自己的 LoRA,锁定风格或角色。

    默认值
    []
    范围
    0 – 3 items
    内部字段
    • loras[].pathstring必填

      Direct URL of a LoRA weights file.

      范围
      1 – … chars · application/octet-stream
    • loras[].scalenumber必填

      Weight strength from zero to four.

      默认值
      1
      范围
      0 – 4
  • seedinteger可选

    用同一个数字,结果就能复现。

    范围
    0 – 2147483647
原始 JSON Schema
{
  "additionalProperties": false,
  "properties": {
    "aspect_ratio": {
      "default": "auto",
      "description": "Output aspect ratio; auto keeps the shape of the first source image.",
      "enum": [
        "auto",
        "1:1",
        "16:9",
        "9:16",
        "4:3",
        "3:4",
        "3:2",
        "2:3",
        "21:9",
        "9:21"
      ],
      "type": "string"
    },
    "image_urls": {
      "description": "One to three source images, in the order your prompt refers to them.",
      "items": {
        "contentMediaType": [
          "image/jpeg",
          "image/png",
          "image/webp",
          "image/gif"
        ],
        "format": "uri",
        "minLength": 1,
        "type": "string"
      },
      "maxItems": 3,
      "minItems": 1,
      "type": "array"
    },
    "loras": {
      "default": [],
      "description": "Up to three LoRA weight files trained for FLUX.2 [klein] 4B or FLUX.2 [klein] Base 4B, each with its own strength.",
      "items": {
        "additionalProperties": false,
        "properties": {
          "path": {
            "contentMediaType": [
              "application/octet-stream"
            ],
            "description": "Direct URL of a LoRA weights file.",
            "format": "uri",
            "minLength": 1,
            "type": "string"
          },
          "scale": {
            "default": 1,
            "description": "Weight strength from zero to four.",
            "maximum": 4,
            "minimum": 0,
            "type": "number"
          }
        },
        "required": [
          "path",
          "scale"
        ],
        "type": "object"
      },
      "maxItems": 3,
      "type": "array"
    },
    "prompt": {
      "description": "Say what to change and what must stay the same. Put a LoRA trigger phrase first.",
      "maxLength": 5000,
      "minLength": 1,
      "type": "string"
    },
    "resolution": {
      "default": "1k",
      "description": "Output size tier when you choose an aspect ratio; with auto the result keeps the shape of the first source image.",
      "enum": [
        "1k",
        "2k"
      ],
      "type": "string"
    },
    "seed": {
      "description": "Random seed for controlled comparisons.",
      "maximum": 2147483647,
      "minimum": 0,
      "type": "integer"
    }
  },
  "required": [
    "prompt",
    "image_urls"
  ],
  "type": "object"
}

FLUX.2 Klein 4B LoRA 的真实成片

Diner pencil redraw
提示词Colored pencil hyperdetailed realism. Redraw this photo as a colored pencil drawing at blue hour: the diner windows now show a cobalt dusk sky, the lights inside are warm, and the top buttons of her yellow shirt-dress are undone as she leans on the counter with her chin on her hand, smiling at the viewer. Keep her face and hair.
通过 API 发出的同一个请求
{
  "model": "black-forest-labs/flux-2-klein-4b-lora/edit",
  "input": {
    "prompt": "Colored pencil hyperdetailed realism. Redraw this photo as a colored pencil drawing at blue hour: the diner windows now show a cobalt dusk sky, the lights inside are warm, and the top buttons of her yellow shirt-dress are undone as she leans on the counter with her chin on her hand, smiling at the viewer. Keep her face and hair.",
    "image_urls": [
      "https://media.popnow.ai/influencer/examples/marco.webp"
    ],
    "aspect_ratio": "auto",
    "resolution": "1k",
    "seed": 28843
  }
}

这条是从上传的文件开始的:把示例链接换成你自己的文件链接。

响应、轮询与回调

所有模型的用法都一样:先建任务,再轮询,或者等回调。

先报价

cURL
curl -X POST https://api.popnow.ai/api/v1/jobs/quote \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "black-forest-labs/flux-2-klein-4b-lora/edit",
  "input": {
    "prompt": "A ceramic teapot on a linen cloth, soft window light, muted palette",
    "image_urls": [
      "https://media.popnow.ai/influencer/examples/marco.webp"
    ],
    "aspect_ratio": "auto",
    "resolution": "1k"
  }
}'

请求体和 createTask 相同。它返回预计扣费和最高可能扣费,不会真正运行。

已受理

HTTP
HTTP/1.1 202 Accepted

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "task_01k3m8x9q2z4v7n5p6r8s0t1w3",
    "state": "queued"
  },
  "request_id": "req_example_create"
}

HTTP 202 表示任务已受理,积分先冻结、还没有扣。最终扣费不会超过冻结额。

查询状态

cURL
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

每隔几秒查一次并逐步拉长间隔,state 变成 succeeded、failed、canceled 或 expired 时停止。

完成的任务

JSON
{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "task_01k3m8x9q2z4v7n5p6r8s0t1w3",
    "model": "black-forest-labs/flux-2-klein-4b-lora/edit",
    "state": "succeeded",
    "output": {
      "assets": [
        {
          "url": "https://cdn.popnow.ai/tasks/task_01k3m8x9q2z4v7n5p6r8s0t1w3/output.png?signature=FROM_RESPONSE",
          "expiresAt": "2026-10-17T12:20:00Z",
          "mime": "image/png",
          "width": 1024,
          "height": 1024
        }
      ]
    },
    "settled": true
  },
  "request_id": "req_example_record"
}

在 expiresAt 之前从 url 下载。之后要新链接,请调用 POST /common/download-url。

校验回调

Node.js
import { createHash, createHmac, timingSafeEqual } from "node:crypto";
import express from "express";

const app = express();
// express.raw keeps the exact bytes that were signed; express.json would not match.
app.post("/hooks/popnow", express.raw({ type: "application/json" }), (req, res) => {
  const timestamp = req.header("X-Webhook-Timestamp");
  const signature = req.header("X-Webhook-Signature") ?? "";
  const body = JSON.parse(req.body.toString("utf8"));
  const taskId = body.data?.taskId ?? body.task_id;
  const digest = createHash("sha256").update(req.body).digest("hex");
  const expected = createHmac("sha256", process.env.POPNOW_WEBHOOK_SECRET)
    .update(`${taskId}.${timestamp}.${digest}`)
    .digest("base64");
  const ok = expected.length === signature.length && timingSafeEqual(Buffer.from(expected), Buffer.from(signature));
  // Check the signature first, then reject anything older than five minutes.
  if (!ok || Math.abs(Date.now() / 1000 - Number(timestamp)) > 300) return res.status(401).end();
  res.status(200).end(); // answer fast, then fetch the task and store its files
});

设置了 callBackUrl,我们会把完成的任务发给你。先用原始请求体校验签名,再信任它。

上传本地文件

cURL
curl -X POST https://api.popnow.ai/api/v1/common/upload-url \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"contentType": "image/png", "bytes": 482113}'

# PUT the file bytes to data.uploadUrl with every header in data.headers, then commit it:
curl -X POST https://api.popnow.ai/api/v1/files/$FILE_ID/commit \
  -H "Authorization: Bearer $POPNOW_API_KEY"
# The commit returns a popnow://f/... reference. Put it in any image, video or
# audio field of the task input instead of a public https URL.

公开的 https 链接可以直接用。本地文件要先经过 upload-url 和 commit。