API Frequently Asked Questions

No. The API is open and requires no authentication or registration. Simply make requests to the endpoints.

The free tier allows 100 requests per hour per IP address. This is sufficient for most applications. Contact us if you need higher limits.

Make a simple HTTP request:

curl "https://a.strt.it/qr/code/image?data=Hello"

This returns a PNG image of a QR code. No setup, no configuration, no complexity.

Two formats:

• PNG image (GET /qr/code/image) - Direct image for embedding in HTML or downloading
• Base64 data URL (POST /qr/code) - JSON response for processing or storing

You don't. The API automatically detects the type based on the data format:

• https:// or http:// = URL
• BEGIN:VCARD = Contact card
• WIFI:T: = WiFi credentials
• mailto: = Email address
• tel: = Phone number
• Everything else = Plain text

Yes. Add color parameters:

POST /qr/code
{
  "data": "https://example.com",
  "colors": {
    "fg": "#2563eb",
    "bg": "#f8fafc"
  }
}

2048 characters. This is sufficient for most use cases including URLs, contact information, and WiFi credentials.

Use GET with query parameters:

GET /qr/bcard/image?name=John%[email protected]

Or POST with JSON:

POST /qr/bcard
{
  "contact": {
    "name": "John Doe",
    "email": "[email protected]"
  }
}

The QR code contains a vCard with all provided information: name, company, position, phone, email, and website. When scanned, phones offer to save the complete contact.

1800x1050 pixels, which is print-ready quality at standard business card dimensions (3.5 x 2 inches). The file can be sent directly to printers.

Yes. CORS is enabled. You can make requests directly from web browsers:

const qrUrl = `https://a.strt.it/qr/code/image?data=${data}`;
document.getElementById('qr').src = qrUrl;

QR code generation: 50-100 milliseconds Business card generation: 1-2 seconds (includes text rendering with Puppeteer)

Yes. The API is specifically designed for AI agents. No authentication means ChatGPT, Claude, and other AI assistants can generate QR codes and business cards directly in conversations.

Yes:

• Interactive Swagger documentation
• Guide for AI agents
• QR API reference
• Business card API reference

The API maintains 99.9% uptime. Services are monitored continuously and hosted on Railway with auto-scaling.

Yes. The API is production-ready and used by applications and AI agents. For commercial use requiring higher rate limits, contact [email protected].

Contact [email protected] or check service health at https://a.strt.it/api/health