# Api18.dev — Hera 1.0 — Image Edit (LLM-ready)

You are integrating the "hera-1.0-image-edit" model from Api18.dev, a REST API for AI media generation. Use ONLY the parameters documented here. All requests are JSON over HTTPS.

## Endpoint & auth

- Base URL: https://api18.dev
- Easiest: POST https://api18.dev/v1/generate?wait=true  (routes by model, waits, returns the finished job)
- Also works: POST /v1/images/generations
- Auth header: Authorization: Bearer api18_xxxxxxxxxxxxxxxx
- Output type: image
- Pricing: $0.070 / run
- Prompt-driven image editing. Upload 1–3 reference images and describe the change.

## Flow

Recommended (one call, no polling): POST to /v1/generate?wait=true with the body below; the response is the finished job and the output is at data[0].url.

Async alternative: POST without ?wait=true, then poll GET /v1/jobs/{id} every ~3s until status is completed or failed; read data[].url. Files are temporary.

## Parameters

- `model` · string · REQUIRED — The model id. Options: "hera-1.0-image-edit".
- `prompt` · string · REQUIRED — What to generate. Max 2500 characters.
- `images` · string[] (URLs) · REQUIRED — Array of 1–3 public image URLs to edit. JPEG/PNG/WEBP/BMP, max 10MB each.
- `seed` · integer · optional — Reproducible results. Omit for a random seed.
- `negative_prompt` · string · optional — Things to avoid in the output.
- `enable_prompt_expansion` · boolean · optional — Auto-expand a short prompt into a richer instruction. Default: false.

## Request body

    {
      "model": "hera-1.0-image-edit",
      "prompt": "Replace the background with a sunny beach, keep the subject unchanged",
      "images": [
        "https://example.com/photo.jpg"
      ]
    }

## curl

    curl -X POST "https://api18.dev/v1/generate?wait=true" \
      -H "Authorization: Bearer $API18_KEY" \
      -H "Content-Type: application/json" \
      -d '{"model":"hera-1.0-image-edit","prompt":"Replace the background with a sunny beach, keep the subject unchanged","images":["https://example.com/photo.jpg"]}'
    
    # → returns the finished job; the output URL is at .data[0].url

## JavaScript

    const res = await fetch("https://api18.dev/v1/generate?wait=true", {
      method: "POST",
      headers: {
        Authorization: `Bearer ${process.env.API18_KEY}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        "model": "hera-1.0-image-edit",
        "prompt": "Replace the background with a sunny beach, keep the subject unchanged",
        "images": [
          "https://example.com/photo.jpg"
        ]
      }),
    });
    const job = await res.json();
    console.log(job.data[0].url); // the generated image

## Python

    import os, requests
    
    KEY = os.environ["API18_KEY"]
    
    job = requests.post(
        "https://api18.dev/v1/generate?wait=true",
        headers={"Authorization": f"Bearer {KEY}"},
        json={'model': "hera-1.0-image-edit", 'prompt': "Replace the background with a sunny beach, keep the subject unchanged", 'images': ["https://example.com/photo.jpg"]},
    ).json()
    
    print(job["data"][0]["url"])  # the generated image

## Job response shape

    { "id", "object": "generation", "model", "output_kind", "status",
      "created_at", "completed_at", "expires_at", "retention_days",
      "error", "cost_usd", "input", "timings": { "inference_ms" },
      "urls": { "get" }, "data": [ { "url" } ] }

## Errors (JSON: { error: { type, message } })

- 401 invalid_api_key · 400 invalid_request · 402 insufficient_balance
- 402 paid_balance_required (promo credit can't be used on the API; add paid balance)
- 404 model_not_found / job_not_found · 502 generation_unavailable (retry)