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fastapi.online HTML to Markdown Converter
x402
fastapi.online HTML to Markdown Converter is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.0005/call, status unknown (last checked 2026-09-15).
Converts raw HTML content into clean Markdown format via a POST request, priced per call with crypto.
Price / call$0.0005
Success—
StatusUnknown
How this service works
Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.
Output
Returns a Markdown-formatted string derived from the submitted HTML, with HTML tags stripped and structure preserved as Markdown syntax (headings, lists, links, bold, etc.).
Example use cases
LLM context preparation from scraped pages
“I just scraped this HTML from a product page and I need it converted to Markdown so I can feed it cleanly to an LLM — here's the raw HTML: <html><body><h1>Product Name</h1><ul><li>Feature 1</li><li>Feature 2</li></ul></body></html>”
Documentation pipeline HTML to Markdown
“We have a bunch of legacy HTML documentation files and I need them converted to Markdown for our new docs site — can you convert this one for me? Here's the HTML content of the first file.”
Clean up email HTML for readable summary
“I received an HTML email newsletter and I want a clean Markdown version of it so I can read it without all the HTML noise — here's the raw HTML of the email.”
Technical details
Endpoint
POSThttps://api.fastapi.online/html-to-markdownWhen to prefer
Choose this endpoint when you need a quick, pay-per-call HTML-to-Markdown conversion without signup, especially in agentic pipelines where scraped HTML needs to be cleaned for LLM consumption. Ideal for one-off or low-volume conversions billed in USDC microtransactions via x402.
Side effects
- HTML exceeds 200,000 character limit — request rejected
- Malformed or deeply nested HTML may produce imperfect Markdown structure
- Payment not included or insufficient — 402 Payment Required response
- Empty HTML body returns empty or minimal Markdown output
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| html | string |
Tags
x402
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