Name: Two-Image Combination API (FLUX Kontext Pro Multi-Image)
Brand: magicapi
SKU: api-magicapi-image-combination-ai-api-flux-kontext-apps-multi-image-kontext-pro
Availability: InStock
Author: API Market

Shashank Agarwal

# 🖼️ Two-Image Combination API (FLUX Kontext Pro Multi-Image)

## Overview
Multi-Image Kontext Pro is part of the FLUX Kontext apps collection. Its developer describes it as an experimental model with FLUX Kontext Pro that can combine two input images. You send two images and a text `prompt` that says how to combine or transform them, and get back the URL of one image.

## Features
- **Two images and a prompt in, one image out**: `prompt`, `input_image_1` and `input_image_2` are all required. Each image must be a jpeg, png, gif or webp file.
- **Aspect ratio**: `match_input_image` (default), `1:1`, `16:9`, `9:16`, `4:3`, `3:4`, `3:2`, `2:3`, `4:5`, `5:4`, `21:9`, `9:21`, `2:1` or `1:2`.
- **Output format**: `png` (default) or `jpg`.
- **Safety and reproducibility**: `safety_tolerance` from 0 (most strict) to 2 (most permissive, and the default). 2 is currently the maximum allowed. Set `seed` for reproducible generation.

## Use Cases
1. **Put two subjects in one scene**: place a person next to a character, product or object from another photo.
2. **Product and marketing images**: combine a product shot with a lifestyle or background image.
3. **Creative composites**: describe how two pictures should be merged and let the model build the scene.
4. **Storyboards and concepts**: quickly try out how elements from two images look together.

## Visual Examples
This is a real request sent through api.market and the file it returned.

### Example Input
- `input_image_1`: [first input image](https://blog.api.market/wp-content/uploads/2026/09/kling-v2-1-input-api-market.webp)
- `input_image_2`: [second input image](https://blog.api.market/wp-content/uploads/2026/09/kling-v2-6-motion-control-input-character-api-market.webp)
- `prompt`: "Put the astronaut standing next to the woman on the rainy street"

All other fields were left at their defaults.

### Example Output
![A woman in a yellow raincoat standing next to an astronaut in a white spacesuit on a rainy city street at night](https://blog.api.market/wp-content/uploads/2026/10/multi-image-kontext-pro-output-api-market.webp)

The image shown is a resized WebP copy of the PNG file the request returned.

## Input Parameters
| Field | Type | Required | Default | Allowed values | Description |
| --- | --- | --- | --- | --- | --- |
| `prompt` | string | Yes |  |  | Text description of how to combine or transform the two input images |
| `input_image_1` | string | Yes |  | URL | First input image. Must be jpeg, png, gif, or webp. |
| `input_image_2` | string | Yes |  | URL | Second input image. Must be jpeg, png, gif, or webp. |
| `aspect_ratio` | string | No | `match_input_image` | `match_input_image`, `1:1`, `16:9`, `9:16`, `4:3`, `3:4`, `3:2`, `2:3`, `4:5`, `5:4`, `21:9`, `9:21`, `2:1`, `1:2` | Aspect ratio of the generated image. Use 'match_input_image' to match the aspect ratio of the input image. |
| `output_format` | string | No | `png` | `jpg`, `png` | Output format for the generated image |
| `safety_tolerance` | integer | No | `2` | 0 to 2 | Safety tolerance, 0 is most strict and 2 is most permissive. 2 is currently the maximum allowed. |
| `seed` | integer | No |  |  | Random seed. Set for reproducible generation |

### Output
`output` is the URL of one image (a string). Files are PNG by default, or JPG with `output_format` set to `jpg`.

## Pricing
- **Pay As You Go (PAYG) pricing**: you only pay for what you use.
- **Price**: $0.05 per API unit.
- **1 API unit = 1 output image.** Each request returns one image, so each successful request costs 1 unit, $0.05.
- The aspect ratio and output format do not change the price.
- **Failed or cancelled predictions are not billed.**
- **GET requests to check prediction status** (GET /api/v1/magicapi/image-combination-ai-api-flux-kontext-apps-multi-image-kontext-pro/predictions/{id}) 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/image-combination-ai-api-flux-kontext-apps-multi-image-kontext-pro`

### 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`. 201 means the request was accepted; it is not an error.
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/image-combination-ai-api-flux-kontext-apps-multi-image-kontext-pro/predictions" \
  -H "Content-Type: application/json" \
  -H "x-api-market-key: YOUR_API_MARKET_KEY" \
  -d '{
    "version": "93b90058443599a0623db1d176446e246194e68e1e3e0b8febef90543a992e06",
    "input": {
      "input_image_1": "https://blog.api.market/wp-content/uploads/2026/09/kling-v2-1-input-api-market.webp",
      "input_image_2": "https://blog.api.market/wp-content/uploads/2026/09/kling-v2-6-motion-control-input-character-api-market.webp",
      "prompt": "Put the astronaut standing next to the woman on the rainy street"
    }
  }'
```

Response (201 Created):
```json
{
  "id": "ufawqhfynnddngldkgtslldrkq",
  "version": "93b90058443599a0623db1d176446e246194e68e1e3e0b8febef90543a992e06",
  "status": "starting",
  "created_at": "2026-10-13T10:40:12.511Z"
}
```

#### Check Prediction Status
```bash
curl -X GET "https://prod.api.market/api/v1/magicapi/image-combination-ai-api-flux-kontext-apps-multi-image-kontext-pro/predictions/ufawqhfynnddngldkgtslldrkq" \
  -H "x-api-market-key: YOUR_API_MARKET_KEY"
```

Response when the prediction has finished (200 OK):
```json
{
  "id": "ufawqhfynnddngldkgtslldrkq",
  "status": "succeeded",
  "output": "https://blog.api.market/wp-content/uploads/2026/10/multi-image-kontext-pro-output-api-market.webp",
  "error": null,
  "created_at": "2026-10-13T10:40:12.511Z",
  "started_at": "2026-10-13T10:40:13.020Z",
  "completed_at": "2026-10-13T10:40:21.734Z"
}
```

### 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`, `input_image_1` or `input_image_2`.
- **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

All plans allow 10 requests per second. Requests above that return `429 Too Many Requests`; back off before retrying and honour any `Retry-After` header. Polling a prediction with GET is free but still counts toward the per-second limit, so poll every 1 to 5 seconds rather than in a tight loop.

## 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

### JavaScript
```javascript
const apiKey = "YOUR_API_MARKET_KEY";
const baseUrl = "https://prod.api.market/api/v1/magicapi/image-combination-ai-api-flux-kontext-apps-multi-image-kontext-pro";

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: "93b90058443599a0623db1d176446e246194e68e1e3e0b8febef90543a992e06", 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({
  "input_image_1": "https://blog.api.market/wp-content/uploads/2026/09/kling-v2-1-input-api-market.webp",
  "input_image_2": "https://blog.api.market/wp-content/uploads/2026/09/kling-v2-6-motion-control-input-character-api-market.webp",
  "prompt": "Put the astronaut standing next to the woman on the rainy street"
}).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/image-combination-ai-api-flux-kontext-apps-multi-image-kontext-pro"

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": "93b90058443599a0623db1d176446e246194e68e1e3e0b8febef90543a992e06", "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({
  "input_image_1": "https://blog.api.market/wp-content/uploads/2026/09/kling-v2-1-input-api-market.webp",
  "input_image_2": "https://blog.api.market/wp-content/uploads/2026/09/kling-v2-6-motion-control-input-character-api-market.webp",
  "prompt": "Put the astronaut standing next to the woman on the rainy street"
}))
```

## FAQ
- **How many input images can I send?**
  - Exactly two: `input_image_1` and `input_image_2`. Both are required, as is `prompt`.
- **What should the prompt say?**
  - Describe how to combine or transform the two images, for example "Put the astronaut standing next to the woman on the rainy street".
- **Is this model stable?**
  - Its developer calls it experimental. Set `seed` to reproduce a result.
- **How many images does one request return?**
  - One. `output` is a single image URL, billed at $0.05.
- **Is the 201 response from POST an error?**
  - No. 201 Created means the prediction was accepted. 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.


Send two images and a prompt that says how to combine them, and get back one image. Built on FLUX Kontext Pro. $0.05 per image, pay as you go.