HTML to Markdown API

Convert HTML to clean Markdown -- strips scripts/styles, preserves headings, links, lists, images. 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": {
    "html-to-markdown": {
      "url": "https://html-to-markdown.api.klymax402.com/mcp"
    }
  }
}

Related MCP server: urltomarkdown-mcp

Quickstart -- HTTP (x402)

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

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

Parameters

Example response:

{"markdown":"# Hello World\n\nThis is **bold** and *italic*.\n\n[Link](https://example.com)","inputLength":156,"outputLength":68,"strippedElements":["script","style"]}

When to use: converting web content to LLM-friendly format, migrating CMS content, cleaning up HTML emails, and preparing content for markdown-based systems.

Not for: markdown to HTML (use text_convert_markdown_to_html), web scraping (fetching + converting) (use web_scrape_to_markdown), PDF generation (use document_generate_pdf).

Example agent prompts

• "Convert HTML to clean Markdown text"

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