QR Code Generator API

Generate QR codes from text or URLs -- base64 PNG output, configurable size. Fast and lightweight. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "qr-code": {
      "url": "https://qr-code.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl -X POST "https://qr-code.api.klymax402.com/api/qr" \
  -H "Content-Type: application/json" \
  -d '{"data":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
utility_generate_qr_code	POST	/api/qr	$0.003	Generate a QR code image from text or URL

utility_generate_qr_code

Use this when you need to generate a QR code from text, a URL, or any string data. Returns base64 image data in JSON.

Parameters

Name	Type	Required	Description
data	string	yes	The text or URL to encode in the QR code
size	number	no	QR code size in modules (default: 21 for version 1)

Example response:

{"data":"https://example.com","image":"iVBORw0KGgo...","width":210,"height":210,"format":"png"}

When to use: generating shareable links, payment QR codes, Wi-Fi connection codes, vCard contact sharing, and event ticket barcodes.

Not for: screenshots (use capture_screenshot), PDFs (use document_generate_pdf).

Example agent prompts

• "Generate a QR code from text, a URL, or any string data"

Payment

• Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
• Network: Base L2 (eip155:8453)
• Asset: USDC
• Facilitator: Coinbase CDP (primary), PayAI (fallback)
• Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

• Catalog: https://klymax402.com/llms.txt
• Full API reference: https://klymax402.com/llms-full.txt
• Live stats: https://klymax402.com/stats

License

MIT