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POST
/
bfl
/
v1
/
flux-2-klein-9b
cURL
curl --request POST \
  --url https://api.ttapi.io/bfl/v1/flux-2-klein-9b \
  --header 'Content-Type: application/json' \
  --header 'TT-API-KEY: <api-key>' \
  --data '
{
  "prompt": "<string>",
  "input_image": "<string>",
  "input_image_2": "<string>",
  "input_image_3": "<string>",
  "input_image_4": "<string>",
  "image_prompt": "<string>",
  "width": "<string>",
  "height": "<string>",
  "seed": "<string>",
  "output_format": "jpeg",
  "safety_tolerance": "2",
  "webhook_url": "<string>"
}
'
import requests

url = "https://api.ttapi.io/bfl/v1/flux-2-klein-9b"

payload = {
"prompt": "<string>",
"input_image": "<string>",
"input_image_2": "<string>",
"input_image_3": "<string>",
"input_image_4": "<string>",
"image_prompt": "<string>",
"width": "<string>",
"height": "<string>",
"seed": "<string>",
"output_format": "jpeg",
"safety_tolerance": "2",
"webhook_url": "<string>"
}
headers = {
"TT-API-KEY": "<api-key>",
"Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)
const options = {
method: 'POST',
headers: {'TT-API-KEY': '<api-key>', 'Content-Type': 'application/json'},
body: JSON.stringify({
prompt: '<string>',
input_image: '<string>',
input_image_2: '<string>',
input_image_3: '<string>',
input_image_4: '<string>',
image_prompt: '<string>',
width: '<string>',
height: '<string>',
seed: '<string>',
output_format: 'jpeg',
safety_tolerance: '2',
webhook_url: '<string>'
})
};

fetch('https://api.ttapi.io/bfl/v1/flux-2-klein-9b', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));
<?php

$curl = curl_init();

curl_setopt_array($curl, [
CURLOPT_URL => "https://api.ttapi.io/bfl/v1/flux-2-klein-9b",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'prompt' => '<string>',
'input_image' => '<string>',
'input_image_2' => '<string>',
'input_image_3' => '<string>',
'input_image_4' => '<string>',
'image_prompt' => '<string>',
'width' => '<string>',
'height' => '<string>',
'seed' => '<string>',
'output_format' => 'jpeg',
'safety_tolerance' => '2',
'webhook_url' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"TT-API-KEY: <api-key>"
],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}
package main

import (
"fmt"
"strings"
"net/http"
"io"
)

func main() {

url := "https://api.ttapi.io/bfl/v1/flux-2-klein-9b"

payload := strings.NewReader("{\n \"prompt\": \"<string>\",\n \"input_image\": \"<string>\",\n \"input_image_2\": \"<string>\",\n \"input_image_3\": \"<string>\",\n \"input_image_4\": \"<string>\",\n \"image_prompt\": \"<string>\",\n \"width\": \"<string>\",\n \"height\": \"<string>\",\n \"seed\": \"<string>\",\n \"output_format\": \"jpeg\",\n \"safety_tolerance\": \"2\",\n \"webhook_url\": \"<string>\"\n}")

req, _ := http.NewRequest("POST", url, payload)

req.Header.Add("TT-API-KEY", "<api-key>")
req.Header.Add("Content-Type", "application/json")

res, _ := http.DefaultClient.Do(req)

defer res.Body.Close()
body, _ := io.ReadAll(res.Body)

fmt.Println(string(body))

}
HttpResponse<String> response = Unirest.post("https://api.ttapi.io/bfl/v1/flux-2-klein-9b")
.header("TT-API-KEY", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"prompt\": \"<string>\",\n \"input_image\": \"<string>\",\n \"input_image_2\": \"<string>\",\n \"input_image_3\": \"<string>\",\n \"input_image_4\": \"<string>\",\n \"image_prompt\": \"<string>\",\n \"width\": \"<string>\",\n \"height\": \"<string>\",\n \"seed\": \"<string>\",\n \"output_format\": \"jpeg\",\n \"safety_tolerance\": \"2\",\n \"webhook_url\": \"<string>\"\n}")
.asString();
require 'uri'
require 'net/http'

url = URI("https://api.ttapi.io/bfl/v1/flux-2-klein-9b")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["TT-API-KEY"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"prompt\": \"<string>\",\n \"input_image\": \"<string>\",\n \"input_image_2\": \"<string>\",\n \"input_image_3\": \"<string>\",\n \"input_image_4\": \"<string>\",\n \"image_prompt\": \"<string>\",\n \"width\": \"<string>\",\n \"height\": \"<string>\",\n \"seed\": \"<string>\",\n \"output_format\": \"jpeg\",\n \"safety_tolerance\": \"2\",\n \"webhook_url\": \"<string>\"\n}"

response = http.request(request)
puts response.read_body
{
  "status": "SUCCESS",
  "message": "success",
  "data": {
    "jobId": "jobId"
  }
}
{
"status": "FAILED",
"message": "\"prompt\" cannot be empty.",
"data": {}
}
{
"status": "FAILED",
"message": "Wrong TT-API-KEY or email is not activated."
}

Authorizations

TT-API-KEY
string
header
required

You can obtain your API key from the TTAPI Dashboard.

Body

application/json
prompt
string
required

Image description. Note: Flux supports multilingual understanding, but English performs best in testing.

input_image
string

Reference image 1, URL or base64

input_image_2
string

Reference image 2, URL or base64

input_image_3
string

Reference image 3, URL or base64

input_image_4
string

Reference image 4, URL or base64

image_prompt
string

Reference image, base64 encoded

width
string

Width of generated image. Range: 256-1440, must be a multiple of 32. Default: 1024

height
string

Height of generated image. Range: 256-1440, must be a multiple of 32. Default: 768

seed
string

Random seed

output_format
enum<string>

Output format

Available options:
jpeg,
png
Example:

"jpeg"

safety_tolerance
integer

Safety tolerance level for input and output adjustment. Range: 0-6, where 0 is strictest and 6 is most permissive. Default: 2

Example:

"2"

webhook_url
string

Asynchronous callback URL

Response

Request successful

status
string
required
Example:

"SUCCESS"

message
string
required
Example:

"success"

data
object
required
Example:
{ "jobId": "jobId" }
Last modified on March 24, 2026