Markdown to HTML API

Convert Markdown to clean HTML -- headings, lists, code blocks, tables, links, images. Optional full document wrap. 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": {
    "markdown-to-html": {
      "url": "https://markdown-to-html.api.klymax402.com/mcp"
    }
  }
}

Related MCP server: markdown-renderer

Quickstart -- HTTP (x402)

curl -X POST "https://markdown-to-html.api.klymax402.com/api/convert" \
  -H "Content-Type: application/json" \
  -d '{"markdown":"..."}'
# -> 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

text_convert_markdown_to_html

Use this when you need to convert Markdown text to clean HTML. Returns the converted HTML in JSON.

Parameters

Example response:

{"html":"<h1>Hello World</h1>\n<p>This is <strong>bold</strong> and <em>italic</em>.</p>","inputLength":42,"outputLength":68}

When to use: rendering markdown content in web apps, converting README files, building documentation pages, and email template generation from markdown.

Not for: HTML to markdown (use text_convert_html_to_markdown), styled HTML with CSS themes (use text_render_markdown), PDF generation (use document_generate_pdf).

Example agent prompts

• "Convert Markdown text to clean HTML"

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