Free AI Image Generation API 2026 — No Credit Card, Real SDK, 56+ Models

pip install openai  # NexaAPI is OpenAI-compatible

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_RAPIDAPI_KEY",
    base_url="https://nexa-api.com/v1"  # Just change this!
)

response = client.images.generate(
    model="flux-pro-1.1",
    prompt="A futuristic city at sunset, photorealistic, 4K",
    size="1024x1024",
    n=1
)
print("Image URL:", response.data[0].url)

npm install openai  # NexaAPI is OpenAI-compatible

import OpenAI from 'openai';

const client = new OpenAI({
  apiKey: process.env.NEXAAPI_KEY,
  baseURL: 'https://nexa-api.com/v1'
});

const response = await client.images.generate({
  model: 'flux-pro-1.1',
  prompt: 'A futuristic city at sunset, photorealistic, 4K',
  size: '1024x1024',
  n: 1
});

console.log('Image URL:', response.data[0].url);

from fastapi import FastAPI
from openai import OpenAI
from pydantic import BaseModel

app = FastAPI()
client = OpenAI(
    api_key="YOUR_RAPIDAPI_KEY",
    base_url="https://nexa-api.com/v1"
)

class ImageRequest(BaseModel):
    prompt: str
    model: str = "flux-pro-1.1"
    size: str = "1024x1024"

@app.post("/generate")
async def generate_image(request: ImageRequest):
    response = client.images.generate(
        model=request.model,
        prompt=request.prompt,
        size=request.size,
        n=1
    )
    return {
        "image_url": response.data[0].url,
        "cost": 0.003
    }

import express from 'express';
import OpenAI from 'openai';

const app = express();
const client = new OpenAI({
  apiKey: process.env.NEXAAPI_KEY,
  baseURL: 'https://nexa-api.com/v1'
});
app.use(express.json());

app.post('/generate', async (req, res) => {
  const { prompt, model = 'flux-pro-1.1', size = '1024x1024' } = req.body;
  const response = await client.images.generate({ model, prompt, size, n: 1 });
  res.json({ imageUrl: response.data[0].url, cost: 0.003 });
});

app.listen(3000, () => console.log('Image API server running on port 3000'));