Summary
Generates QR codes on demand via a remote API endpoint. You pass in text or a URL through the MCP tool interface, and it returns a base64-encoded PNG you can display or save. Runs as a hosted service at qr-code.api.klymax402.com with server-sent events transport, so there's nothing to install locally. Uses x402 micropayments, meaning you'll need credits to generate codes. The repository itself is pretty bare, just the integration layer without much documentation visible. Reach for this when you need programmatic QR code generation in a Claude workflow without spinning up your own encoding library, though you'll want to check pricing and rate limits before committing to it for high-volume use cases.
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →
Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →
Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →
belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →
Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →
Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →Tools
Public tool metadata for what this MCP can expose to an agent.
1 tools
utility_generate_qr_codeUse this when you need to generate a QR code from text, a URL, or any string data. Returns base64 image data in JSON. Returns: 1. image (base64-encoded PNG) 2. width and height in pixels 3. data (the2 params
Use this when you need to generate a QR code from text, a URL, or any string data. Returns base64 image data in JSON. Returns: 1. image (base64-encoded PNG) 2. width and height in pixels 3. data (the
Parameters* required
datastringThe text or URL to encode in the QR code
sizenumberQR code size in modules (default: 21 for version 1)
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
Featured
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →