Alt Text Batch
Batch-process multiple images to generate AI-powered alt text descriptions for accessibility. Supports up to 500 images per run. Calls the x402 /alt-text endpoint per image — $0.01 USDC each, gasless EIP-3009.
Parameters
| Parameter | Type | Required | Description |
|---|---|---|---|
images |
array | ✅ | List of image URLs (max 500) |
context |
string | ❌ | Shared page/product context for all images |
max_length |
integer | ❌ | Max chars for each alt_text (default: 125) |
Example Request
POST https://x402.ntriq.co.kr/alt-text
Content-Type: application/json
{ "image_url": "https://example.com/product.jpg" }
# Returns 402 → auto-pay $0.01 USDC → result
# Repeat per image in batch
Example Response (per image)
{
"alt_text": "Red leather handbag with gold clasp on white background",
"description": "A structured red leather handbag featuring a gold-tone magnetic clasp, dual top handles, and a detachable shoulder strap. Shot on a clean white studio background.",
"tags": ["fashion", "handbag", "leather", "product"],
"confidence": 0.96
}
Use Cases
- E-commerce product catalog accessibility (100–500 images/run)
- CMS image library auto-captioning
- Legal document image labeling at scale
- Medical image batch annotation (on-premise safe — no cloud upload)
Access
# x402 endpoint — $0.01 USDC per image (Base mainnet)
POST https://x402.ntriq.co.kr/alt-text
# Service catalog
curl https://x402.ntriq.co.kr/services
x402 micropayments — USDC on Base, gasless EIP-3009