cURL
curl --request POST \
--url https://api.ttapi.io/bfl/v1/flux-3-image-klein \
--header 'Content-Type: application/json' \
--header 'TT-API-KEY: <api-key>' \
--data '
{
"prompt": "<string>",
"images": "<string>",
"aspect_ratio": "auto",
"width": 3160,
"height": 3160,
"seed": 2147483647,
"safety_tolerance": 2,
"output_format": "jpeg",
"steps": 16,
"webhook_url": "<string>"
}
'import requests
url = "https://api.ttapi.io/bfl/v1/flux-3-image-klein"
payload = {
"prompt": "<string>",
"images": "<string>",
"aspect_ratio": "auto",
"width": 3160,
"height": 3160,
"seed": 2147483647,
"safety_tolerance": 2,
"output_format": "jpeg",
"steps": 16,
"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>',
images: '<string>',
aspect_ratio: 'auto',
width: 3160,
height: 3160,
seed: 2147483647,
safety_tolerance: 2,
output_format: 'jpeg',
steps: 16,
webhook_url: '<string>'
})
};
fetch('https://api.ttapi.io/bfl/v1/flux-3-image-klein', 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-3-image-klein",
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>',
'images' => '<string>',
'aspect_ratio' => 'auto',
'width' => 3160,
'height' => 3160,
'seed' => 2147483647,
'safety_tolerance' => 2,
'output_format' => 'jpeg',
'steps' => 16,
'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-3-image-klein"
payload := strings.NewReader("{\n \"prompt\": \"<string>\",\n \"images\": \"<string>\",\n \"aspect_ratio\": \"auto\",\n \"width\": 3160,\n \"height\": 3160,\n \"seed\": 2147483647,\n \"safety_tolerance\": 2,\n \"output_format\": \"jpeg\",\n \"steps\": 16,\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-3-image-klein")
.header("TT-API-KEY", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"prompt\": \"<string>\",\n \"images\": \"<string>\",\n \"aspect_ratio\": \"auto\",\n \"width\": 3160,\n \"height\": 3160,\n \"seed\": 2147483647,\n \"safety_tolerance\": 2,\n \"output_format\": \"jpeg\",\n \"steps\": 16,\n \"webhook_url\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.ttapi.io/bfl/v1/flux-3-image-klein")
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 \"images\": \"<string>\",\n \"aspect_ratio\": \"auto\",\n \"width\": 3160,\n \"height\": 3160,\n \"seed\": 2147483647,\n \"safety_tolerance\": 2,\n \"output_format\": \"jpeg\",\n \"steps\": 16,\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."
}Flux 3
Generate an image with FLUX 3 Image Klein
Use the FLUX 3 Image Klein API to generate or edit images. It belongs to the same FLUX 3 image family, runs smaller and faster, and accepts exact size, seed, and sampling steps.
POST
/
bfl
/
v1
/
flux-3-image-klein
cURL
curl --request POST \
--url https://api.ttapi.io/bfl/v1/flux-3-image-klein \
--header 'Content-Type: application/json' \
--header 'TT-API-KEY: <api-key>' \
--data '
{
"prompt": "<string>",
"images": "<string>",
"aspect_ratio": "auto",
"width": 3160,
"height": 3160,
"seed": 2147483647,
"safety_tolerance": 2,
"output_format": "jpeg",
"steps": 16,
"webhook_url": "<string>"
}
'import requests
url = "https://api.ttapi.io/bfl/v1/flux-3-image-klein"
payload = {
"prompt": "<string>",
"images": "<string>",
"aspect_ratio": "auto",
"width": 3160,
"height": 3160,
"seed": 2147483647,
"safety_tolerance": 2,
"output_format": "jpeg",
"steps": 16,
"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>',
images: '<string>',
aspect_ratio: 'auto',
width: 3160,
height: 3160,
seed: 2147483647,
safety_tolerance: 2,
output_format: 'jpeg',
steps: 16,
webhook_url: '<string>'
})
};
fetch('https://api.ttapi.io/bfl/v1/flux-3-image-klein', 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-3-image-klein",
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>',
'images' => '<string>',
'aspect_ratio' => 'auto',
'width' => 3160,
'height' => 3160,
'seed' => 2147483647,
'safety_tolerance' => 2,
'output_format' => 'jpeg',
'steps' => 16,
'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-3-image-klein"
payload := strings.NewReader("{\n \"prompt\": \"<string>\",\n \"images\": \"<string>\",\n \"aspect_ratio\": \"auto\",\n \"width\": 3160,\n \"height\": 3160,\n \"seed\": 2147483647,\n \"safety_tolerance\": 2,\n \"output_format\": \"jpeg\",\n \"steps\": 16,\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-3-image-klein")
.header("TT-API-KEY", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"prompt\": \"<string>\",\n \"images\": \"<string>\",\n \"aspect_ratio\": \"auto\",\n \"width\": 3160,\n \"height\": 3160,\n \"seed\": 2147483647,\n \"safety_tolerance\": 2,\n \"output_format\": \"jpeg\",\n \"steps\": 16,\n \"webhook_url\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.ttapi.io/bfl/v1/flux-3-image-klein")
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 \"images\": \"<string>\",\n \"aspect_ratio\": \"auto\",\n \"width\": 3160,\n \"height\": 3160,\n \"seed\": 2147483647,\n \"safety_tolerance\": 2,\n \"output_format\": \"jpeg\",\n \"steps\": 16,\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
You can obtain your API key from the TTAPI Dashboard.
Body
application/json
Free-form prompt describing the image. Without images, it generates a new image from the prompt. With reference images, state what to change and refer to them in order as image 1 and image 2. Bounding boxes can be appended to the prompt, using a 0 to 1000 grid as [top, left, bottom, right].
Optional reference images. Omit them for text-to-image. When present, the prompt edits, restyles, or combines them. Each item is an http(s) URL or base64, 1 to 10 total. The first image is the picture being edited and sets the default output size.
Output aspect ratio. With auto, a reference image uses the first image's exact ratio; without references, a ratio is chosen from the prompt, otherwise 16:9. Ignored when width and height are both set.
Available options:
auto, 21:9, 2:1, 16:9, 3:2, 7:5, 4:3, 5:4, 1:1, 4:5, 3:4, 5:7, 2:3, 9:16, 1:2, 9:21 Resolution tier: 768sq, 1k, 1.5k, 2k, or 4k. Omitted text-to-image requests use 1k. With a reference image and this field omitted, the first image's own size is used, or the nearest tier when aspect_ratio is also set. Ignored when width and height are both set.
Available options:
768sq, 1k, 1.5k, 2k, 4k Output width in pixels, from 64 to 6256. Must be sent together with height, and overrides aspect_ratio and resolution. Width times height must not exceed 16822272 pixels.
Required range:
64 <= x <= 6256Output height in pixels, from 64 to 6256. Must be sent together with width. Width times height must not exceed 16822272 pixels.
Required range:
64 <= x <= 6256Seed used to reproduce a result. Random when omitted. Range: 0 to 4294967295.
Required range:
0 <= x <= 4294967295Harm moderation tolerance from 0 to 7, with 0 the strictest. Default is 2. The route and organization determine the approved maximum and the ceiling for each category.
Required range:
0 <= x <= 7Output image format.
Available options:
jpeg, png Denoising steps. Default is 16. Range: 1 to 16.
Required range:
1 <= x <= 16Async callback URL. The initial response returns jobId. Use this callback or the Flux fetch API to get the final image.
Last modified on October 16, 2026