API Documentation

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A subscription is required to use the API.

LetzAI API Keys are 'Bearer' Tokens. You will need to use them as such in your endpoints.
What is a Bearer Token?

This endpoint allows you to create images.

Parameters

const postData = {
        prompt: 'A beautiful landscape',
        width: 1920,
        height: 1080,
        quality: 5,
        creativity: 6,
        hasWatermark: true,
        systemVersion: 3
      };
      
      fetch('https://api.letz.ai/images', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': 'Bearer YOUR_API_KEY' // Replace YOUR_API_KEY with your actual key
        },
        body: JSON.stringify(postData)
      })
      .then(response => response.json())
      .then(data => console.log(data))
      .catch(error => console.error('Error:', error));

This endpoint allows you to interrupt the image generation process for a specific image.

Path Parameters

This endpoint allows you to change the privacy setting of an image. Images with status 'public' will be visible on the LetzAI feed, published under the account that has created the API key.

Path Parameters

Request Body

This endpoint allows you to retrieve one image including its generation status. It can be used to track the progress of an image, for example during long polling when generating images.

Response

 
    // Replace 'your-image-id' with the actual ID returned by POST
    fetch("https://api.letz.ai/images/your-image-id", {
      method: 'GET',
      headers: {
        'Authorization': 'Bearer YOUR_API_KEY' // Replace YOUR_API_KEY with your actual key
      }
    })
    .then(response => response.json())
    .then(data => console.log(data))
    .catch(error => console.error('Error:', error));

This endpoint allows you to retrieve multiple images. It returns an array containing the amount of images defined under the limit parameter.

Query Parameters

 
    fetch("https://api.letz.ai/images?page=1&limit=20&sortOrder=DESC&sortBy=createdAt", {
      method: 'GET',
      headers: {
        'Authorization': 'Bearer YOUR_API_KEY' // Replace YOUR_API_KEY with your actual key
      }
    })
    .then(response => response.json())
    .then(data => console.log(data))
    .catch(error => console.error('Error:', error));

This endpoint allows you to upscale images. You can provide either an `imageId` or an `imageURL`. The `strength` parameter specifies the degree of upscaling. Lower is more accurate. Higher is more creative.

Request Body

Path Parameters

This endpoint allows you to edit images.

Parameters

Query Parameters

Path Parameters

This endpoint allows you to create videos from images. You can provide either an image ID, a single image URL, or multiple image URLs for multi-frame video generation.

Either imageUrl or imageUrls is required to create a video.

Request Body

const postData = {
        prompt: 'A beautiful sunset over the ocean',
        originalImageCompletionId: '123e4567-e89b-12d3-a456-426614174000',
        width: 1024,
        height: 1024,
        settings: {
            mode: 'default',
            withSound: false,
            highQuality: true,
            duration: 4
        },
        webhookUrl: 'https://your-webhook-url.com/callback'
    };
    
    fetch('https://api.letz.ai/videos', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'Authorization': 'Bearer YOUR_API_KEY' // Replace YOUR_API_KEY with your actual key
        },
        body: JSON.stringify(postData)
    })
    .then(response => response.json())
    .then(data => console.log(data))
    .catch(error => console.error('Error:', error));

This endpoint allows you to retrieve one video including its generation status. It can be used to track the progress of a video, for example during long polling when generating videos.

Path Parameters

Response

 
    // Replace 'your-video-id' with the actual ID returned by POST
    fetch("https://api.letz.ai/videos/your-video-id", {
      method: 'GET',
      headers: {
        'Authorization': 'Bearer YOUR_API_KEY' // Replace YOUR_API_KEY with your actual key
      }
    })
    .then(response => response.json())
    .then(data => console.log(data))
    .catch(error => console.error('Error:', error));

This endpoint allows you to retrieve multiple videos. It returns an array containing the amount of videos defined under the limit parameter.

Query Parameters

 
    fetch("https://api.letz.ai/videos?page=1&limit=20&sortOrder=DESC&sortBy=createdAt", {
      method: 'GET',
      headers: {
        'Authorization': 'Bearer YOUR_API_KEY' // Replace YOUR_API_KEY with your actual key
      }
    })
    .then(response => response.json())
    .then(data => console.log(data))
    .catch(error => console.error('Error:', error));

This endpoint allows you to retrieve available models.

Query Parameters

 
    const queryParams = new URLSearchParams({
        sortBy: 'createdAt',   // or 'usages'
        page: 1,
        limit: 20,             // adjust as needed
        sortOrder: 'DESC',     // or 'ASC'
        search: 'yoursearchquery', //optional
        class: 'Person'        // or 'Object' or 'Style', optional
      });
      
      fetch("https://api.example.com/models?${queryParams}, {
        method: 'GET',
        headers: {
          'Authorization': 'Bearer YOUR_API_KEY'  // Replace YOUR_API_KEY with your actual key
        }
      })
      .then(response => response.json())
      .then(data => console.log(data))
      .catch(error => console.error('Error:', error));

This endpoint allows you to retrieve one model.

Path Parameters

This endpoint allows you to delete your model.

Path Parameters

This endpoint allows you to update information of your model.

Path Parameters

Request Body

This endpoint allows you to update the thumbnail of your model.

Path Parameters

Request Body

The recent success of AI Code Builder tools has made it easy for anyone to build their own apps and user interfaces.

At LetzAI we want to support you as much as we can to build your own apps on top of our API.

As for the different AI Code builders, we recommend using Lovable.dev

When configuring a CustomGPT, make sure to add your LetzAI API Key as a Bearer Token in the Authorization header.

Setting the LetzAI API Key as a Bearer Token

System Prompt

In order for a CustomGPT to generate the desired output and use the right API endpoints, you will need to provide a system prompt. The requirements for your system prompt can vary depending on the use case of your GPT.

OpenAPI Instructions

To configure the actions for your GPT, you will need an OpenAPI documentation. This documentation will help the GPT know the different endpoints and parameters available.

LetzAI Image Generation Custom Node for ComfyUI

Zapier Image Generation Automation

Include LetzAI into Claude by Anthrophic

N8N Image Generation Automation

A custom GPT that uses the LetzAI API to generated images.

The LetzAI API is under constant development. We would love to hear your feedback. If you have any questions, suggestions or comments, please feel free to reach out to us at contact@letz.ai