curl --request POST \
--url https://api.apimart.ai/v1/images/generations \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '{
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}'
import requests
url = "https://api.apimart.ai/v1/images/generations"
payload = {
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.json())
const url = "https://api.apimart.ai/v1/images/generations";
const payload = {
model: "wan2.7-image-pro",
prompt: "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
};
const headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
};
fetch(url, {
method: "POST",
headers: headers,
body: JSON.stringify(payload)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));
package main
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
)
func main() {
url := "https://api.apimart.ai/v1/images/generations"
payload := map[string]interface{}{
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display",
}
jsonData, _ := json.Marshal(payload)
req, _ := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
req.Header.Set("Authorization", "Bearer <token>")
req.Header.Set("Content-Type", "application/json")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
body, _ := ioutil.ReadAll(resp.Body)
fmt.Println(string(body))
}
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.URI;
public class Main {
public static void main(String[] args) throws Exception {
String payload = """
{
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}
""";
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://api.apimart.ai/v1/images/generations"))
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.POST(HttpRequest.BodyPublishers.ofString(payload))
.build();
System.out.println(client.send(request,
HttpResponse.BodyHandlers.ofString()).body());
}
}
<?php
$url = "https://api.apimart.ai/v1/images/generations";
$payload = [
"model" => "wan2.7-image-pro",
"prompt" => "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
];
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload));
curl_setopt($ch, CURLOPT_HTTPHEADER, [
"Authorization: Bearer <token>",
"Content-Type: application/json"
]);
$response = curl_exec($ch);
curl_close($ch);
echo $response;
?>
require 'net/http'
require 'json'
require 'uri'
url = URI("https://api.apimart.ai/v1/images/generations")
payload = {
model: "wan2.7-image-pro",
prompt: "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = "Bearer <token>"
request["Content-Type"] = "application/json"
request.body = payload.to_json
response = http.request(request)
puts response.body
import Foundation
let url = URL(string: "https://api.apimart.ai/v1/images/generations")!
let payload: [String: Any] = [
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
]
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.setValue("Bearer <token>", forHTTPHeaderField: "Authorization")
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpBody = try? JSONSerialization.data(withJSONObject: payload)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
if let error = error { print("Error: \(error)"); return }
if let data = data, let str = String(data: data, encoding: .utf8) { print(str) }
}
task.resume()
using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
class Program
{
static async Task Main(string[] args)
{
var payload = @"{
""model"": ""wan2.7-image-pro"",
""prompt"": ""A flower shop with exquisite windows, beautiful wooden door, flowers on display""
}";
using var client = new HttpClient();
client.DefaultRequestHeaders.Add("Authorization", "Bearer <token>");
var content = new StringContent(payload, Encoding.UTF8, "application/json");
var response = await client.PostAsync(
"https://api.apimart.ai/v1/images/generations", content);
Console.WriteLine(await response.Content.ReadAsStringAsync());
}
}
{
"code": "success",
"data": [
{
"task_id": "task_01HX...",
"status": "processing"
}
]
}
{
"error": {
"code": 400,
"message": "Invalid request parameters",
"type": "invalid_request_error"
}
}
{
"error": {
"code": 401,
"message": "Authentication failed. Please check your API key.",
"type": "authentication_error"
}
}
{
"error": {
"code": 402,
"message": "Insufficient balance. Please top up your account.",
"type": "payment_required"
}
}
{
"error": {
"code": 429,
"message": "Too many requests. Please try again later.",
"type": "rate_limit_error"
}
}
{
"error": {
"code": 500,
"message": "Internal server error. Please try again later.",
"type": "server_error"
}
}
wan2.7-image
wan2.7 Image Generation & Editing
- Wan2.7 image series: supports text-to-image, image editing, interactive editing, sequential generation, and multi-image reference
- Asynchronous processing mode — submit a task and poll for results using the returned task_id
- Supports 1K / 2K / 4K resolution; wan2.7-image-pro supports up to 4K for text-to-image
- Billing is based on the number of successfully generated images, regardless of resolution or aspect ratio
POST
/
v1
/
images
/
generations
curl --request POST \
--url https://api.apimart.ai/v1/images/generations \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '{
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}'
import requests
url = "https://api.apimart.ai/v1/images/generations"
payload = {
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.json())
const url = "https://api.apimart.ai/v1/images/generations";
const payload = {
model: "wan2.7-image-pro",
prompt: "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
};
const headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
};
fetch(url, {
method: "POST",
headers: headers,
body: JSON.stringify(payload)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));
package main
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
)
func main() {
url := "https://api.apimart.ai/v1/images/generations"
payload := map[string]interface{}{
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display",
}
jsonData, _ := json.Marshal(payload)
req, _ := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
req.Header.Set("Authorization", "Bearer <token>")
req.Header.Set("Content-Type", "application/json")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
body, _ := ioutil.ReadAll(resp.Body)
fmt.Println(string(body))
}
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.URI;
public class Main {
public static void main(String[] args) throws Exception {
String payload = """
{
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}
""";
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://api.apimart.ai/v1/images/generations"))
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.POST(HttpRequest.BodyPublishers.ofString(payload))
.build();
System.out.println(client.send(request,
HttpResponse.BodyHandlers.ofString()).body());
}
}
<?php
$url = "https://api.apimart.ai/v1/images/generations";
$payload = [
"model" => "wan2.7-image-pro",
"prompt" => "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
];
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload));
curl_setopt($ch, CURLOPT_HTTPHEADER, [
"Authorization: Bearer <token>",
"Content-Type: application/json"
]);
$response = curl_exec($ch);
curl_close($ch);
echo $response;
?>
require 'net/http'
require 'json'
require 'uri'
url = URI("https://api.apimart.ai/v1/images/generations")
payload = {
model: "wan2.7-image-pro",
prompt: "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = "Bearer <token>"
request["Content-Type"] = "application/json"
request.body = payload.to_json
response = http.request(request)
puts response.body
import Foundation
let url = URL(string: "https://api.apimart.ai/v1/images/generations")!
let payload: [String: Any] = [
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
]
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.setValue("Bearer <token>", forHTTPHeaderField: "Authorization")
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpBody = try? JSONSerialization.data(withJSONObject: payload)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
if let error = error { print("Error: \(error)"); return }
if let data = data, let str = String(data: data, encoding: .utf8) { print(str) }
}
task.resume()
using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
class Program
{
static async Task Main(string[] args)
{
var payload = @"{
""model"": ""wan2.7-image-pro"",
""prompt"": ""A flower shop with exquisite windows, beautiful wooden door, flowers on display""
}";
using var client = new HttpClient();
client.DefaultRequestHeaders.Add("Authorization", "Bearer <token>");
var content = new StringContent(payload, Encoding.UTF8, "application/json");
var response = await client.PostAsync(
"https://api.apimart.ai/v1/images/generations", content);
Console.WriteLine(await response.Content.ReadAsStringAsync());
}
}
{
"code": "success",
"data": [
{
"task_id": "task_01HX...",
"status": "processing"
}
]
}
{
"error": {
"code": 400,
"message": "Invalid request parameters",
"type": "invalid_request_error"
}
}
{
"error": {
"code": 401,
"message": "Authentication failed. Please check your API key.",
"type": "authentication_error"
}
}
{
"error": {
"code": 402,
"message": "Insufficient balance. Please top up your account.",
"type": "payment_required"
}
}
{
"error": {
"code": 429,
"message": "Too many requests. Please try again later.",
"type": "rate_limit_error"
}
}
{
"error": {
"code": 500,
"message": "Internal server error. Please try again later.",
"type": "server_error"
}
}
curl --request POST \
--url https://api.apimart.ai/v1/images/generations \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '{
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}'
import requests
url = "https://api.apimart.ai/v1/images/generations"
payload = {
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.json())
const url = "https://api.apimart.ai/v1/images/generations";
const payload = {
model: "wan2.7-image-pro",
prompt: "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
};
const headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
};
fetch(url, {
method: "POST",
headers: headers,
body: JSON.stringify(payload)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));
package main
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
)
func main() {
url := "https://api.apimart.ai/v1/images/generations"
payload := map[string]interface{}{
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display",
}
jsonData, _ := json.Marshal(payload)
req, _ := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
req.Header.Set("Authorization", "Bearer <token>")
req.Header.Set("Content-Type", "application/json")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
body, _ := ioutil.ReadAll(resp.Body)
fmt.Println(string(body))
}
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.URI;
public class Main {
public static void main(String[] args) throws Exception {
String payload = """
{
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}
""";
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://api.apimart.ai/v1/images/generations"))
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.POST(HttpRequest.BodyPublishers.ofString(payload))
.build();
System.out.println(client.send(request,
HttpResponse.BodyHandlers.ofString()).body());
}
}
<?php
$url = "https://api.apimart.ai/v1/images/generations";
$payload = [
"model" => "wan2.7-image-pro",
"prompt" => "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
];
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload));
curl_setopt($ch, CURLOPT_HTTPHEADER, [
"Authorization: Bearer <token>",
"Content-Type: application/json"
]);
$response = curl_exec($ch);
curl_close($ch);
echo $response;
?>
require 'net/http'
require 'json'
require 'uri'
url = URI("https://api.apimart.ai/v1/images/generations")
payload = {
model: "wan2.7-image-pro",
prompt: "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = "Bearer <token>"
request["Content-Type"] = "application/json"
request.body = payload.to_json
response = http.request(request)
puts response.body
import Foundation
let url = URL(string: "https://api.apimart.ai/v1/images/generations")!
let payload: [String: Any] = [
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
]
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.setValue("Bearer <token>", forHTTPHeaderField: "Authorization")
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpBody = try? JSONSerialization.data(withJSONObject: payload)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
if let error = error { print("Error: \(error)"); return }
if let data = data, let str = String(data: data, encoding: .utf8) { print(str) }
}
task.resume()
using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
class Program
{
static async Task Main(string[] args)
{
var payload = @"{
""model"": ""wan2.7-image-pro"",
""prompt"": ""A flower shop with exquisite windows, beautiful wooden door, flowers on display""
}";
using var client = new HttpClient();
client.DefaultRequestHeaders.Add("Authorization", "Bearer <token>");
var content = new StringContent(payload, Encoding.UTF8, "application/json");
var response = await client.PostAsync(
"https://api.apimart.ai/v1/images/generations", content);
Console.WriteLine(await response.Content.ReadAsStringAsync());
}
}
{
"code": "success",
"data": [
{
"task_id": "task_01HX...",
"status": "processing"
}
]
}
{
"error": {
"code": 400,
"message": "Invalid request parameters",
"type": "invalid_request_error"
}
}
{
"error": {
"code": 401,
"message": "Authentication failed. Please check your API key.",
"type": "authentication_error"
}
}
{
"error": {
"code": 402,
"message": "Insufficient balance. Please top up your account.",
"type": "payment_required"
}
}
{
"error": {
"code": 429,
"message": "Too many requests. Please try again later.",
"type": "rate_limit_error"
}
}
{
"error": {
"code": 500,
"message": "Internal server error. Please try again later.",
"type": "server_error"
}
}
Authorizations
string
required
All requests require Bearer Token authentication.Visit the API Key Management page to obtain your API Key, then add it to the request header:
Authorization: Bearer YOUR_API_KEY
Available Models
| Model | Description | Max Resolution (Text-to-Image) | Max Resolution (Edit / Sequential) | Price |
|---|---|---|---|---|
wan2.7-image-pro | Professional edition, better details, supports 4K | 4K | 2K | ¥0.50 / image |
wan2.7-image | Standard edition, faster generation | 2K | 2K | ¥0.20 / image |
Billing is based on successfully generated images × unit price. Input is not billed. Resolution and aspect ratio do not affect pricing. Failed requests are not charged.
Body
string
required
Image generation model name.
wan2.7-image-pro— Professional edition, up to 4K for text-to-imagewan2.7-image— Standard edition, faster, up to 2K
boolean
default:"false"
Whether to run content moderation before submitting the image task.
true: useomni-moderation-latestto review prompts and input imagesfalseor omitted: do not send a moderation request, adding no moderation cost or latency (default)
string
Text description for image generation, up to 5000 characters.
- Text-to-image (no
image_urls): required - Image editing (with
image_urls): optional but recommended
"A flower shop with exquisite windows, beautiful wooden door, flowers on display"array<string>
Input image URL array for editing and multi-image reference scenarios.Providing this field switches the request to image editing mode.Supported formats: HTTP/HTTPS URLs;
data:image/...;base64,... Base64Constraints: Up to 9 images; JPEG / PNG / WEBP / BMP; 240–8000 px, aspect ratio 1:8 ~ 8:1; ≤ 20MB per imageOutput aspect ratio automatically matches the last input image. Editing mode supports up to 2K only — 4K is not available.
integer
default:"1"
Number of images to generate.
- Standard mode: 1–4 (default 1)
- Sequential mode (
enable_sequential: true): 1–12 (default 1)
Billed per successfully generated image. Pre-charged based on
n.string
Output resolution or aspect ratio. Supports three formats:① Resolution keyword (recommended):
1K / 2K (default) / 4K (wan2.7-image-pro text-to-image only)② Aspect ratio: 1:1 / 16:9 / 9:16 / 4:3 / 3:4 / 3:2 / 2:3 (defaults to 2K tier)③ Pixel dimensions: 1024x1024 or 1024*1024string
Resolution tier keyword:
1K / 2K / 4K. Can be combined with size (aspect ratio).| Model | Scenario | Supported Tiers | Pixel Range |
|---|---|---|---|
wan2.7-image-pro | Text-to-image (non-sequential) | 1K / 2K / 4K | 768×768 ~ 4096×4096 |
wan2.7-image-pro | Editing / sequential | 1K / 2K | 768×768 ~ 2048×2048 |
wan2.7-image | All scenarios | 1K / 2K | 768×768 ~ 2048×2048 |
string
Negative prompt describing elements to avoid. Example:
"blurry, distorted, low quality"boolean
default:"false"
Whether to add an “AI Generated” watermark to the bottom-right corner.
integer
Random seed, range 0–2147483647. Same seed with identical parameters produces visually consistent results.
boolean
default:"true"
Enable enhanced reasoning mode to improve image quality at the cost of longer generation time.
Only effective when sequential mode is disabled and no image input is provided.
boolean
default:"false"
Enable sequential image generation mode — generates multiple thematically coherent images in one request. Ideal for storyboards and series.
- Maximum
nis 12 when enabled thinking_modeandcolor_paletteare ignored in sequential modewan2.7-image-prosupports up to 2K in sequential mode (4K not supported)
array
Bounding boxes for interactive editing — specifies exact regions to edit or insert content.Structure:
[[[x1, y1, x2, y2], ...], ...]- Outer array length must equal the length of
image_urls - Pass
[]for images with no bounding box - Max 2 boxes per image; coordinates are absolute pixel values, origin (0,0) at top-left
[[], [[989, 515, 1138, 681]]]array<object>
Custom color theme. Standard mode only (not sequential mode).
- 3–10 entries (8 recommended); each entry requires
hexandratio - All
ratiovalues must sum to exactly100.00%
[
{ "hex": "#C2D1E6", "ratio": "23.51%" },
{ "hex": "#636574", "ratio": "76.49%" }
]
Response
string
Response status. Returns
"success" on success.array
Examples
Text-to-Image (minimal)
{
"model": "wan2.7-image-pro",
"prompt": "A flower shop with exquisite windows, beautiful wooden door, flowers on display"
}
Text-to-Image (with resolution)
{
"model": "wan2.7-image-pro",
"prompt": "Summer beach, blue sky and white clouds, 4K ultra HD",
"size": "4K",
"thinking_mode": true
}
Text-to-Image (custom color palette)
{
"model": "wan2.7-image-pro",
"prompt": "Minimalist modern living room",
"size": "2K",
"color_palette": [
{ "hex": "#C2D1E6", "ratio": "23.51%" },
{ "hex": "#CDD8E9", "ratio": "20.13%" },
{ "hex": "#B5C8DB", "ratio": "15.88%" },
{ "hex": "#C0B5B4", "ratio": "13.27%" },
{ "hex": "#DAE0EC", "ratio": "10.11%" },
{ "hex": "#636574", "ratio": "8.93%" },
{ "hex": "#CACAD2", "ratio": "5.55%" },
{ "hex": "#CBD4E4", "ratio": "2.62%" }
]
}
Sequential Image Generation
{
"model": "wan2.7-image-pro",
"prompt": "Cinematic series: the same stray orange cat, consistent features. First: under cherry blossoms in spring. Second: old street shade in summer. Third: fallen leaves in autumn. Fourth: snow footprints in winter.",
"enable_sequential": true,
"n": 4,
"size": "2K"
}
Single Image Editing
{
"model": "wan2.7-image",
"prompt": "Replace the background with a sunset scene, warm color tones",
"image_urls": ["https://example.com/portrait.jpg"],
"size": "2K"
}
Multi-Image Reference / Element Fusion
{
"model": "wan2.7-image-pro",
"prompt": "Apply the graffiti from image 2 onto the car in image 1",
"image_urls": [
"https://example.com/car.webp",
"https://example.com/paint.webp"
],
"size": "2K"
}
Interactive Editing (Bounding Box)
bbox_list corresponds 1-to-1 with image_urls. Pass [] for images with no selection.
{
"model": "wan2.7-image-pro",
"prompt": "Place the alarm clock from image 1 into the selected area of image 2, blending naturally",
"image_urls": [
"https://example.com/clock.webp",
"https://example.com/desk.webp"
],
"bbox_list": [
[],
[[989, 515, 1138, 681]]
],
"size": "2K"
}
Querying ResultsImage generation is asynchronous. Poll the Task Status endpoint using the returned
task_id until status == completed.