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fastapi.online Markdown to HTML Converter
x402
fastapi.online Markdown to HTML Converter is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.0005/call, status down (last checked 2026-09-15).
Converts a Markdown string into rendered HTML markup
Price / call$0.0005
Success—
StatusDown
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 the HTML representation of the provided Markdown input, with standard Markdown elements (headings, bold, italic, links, lists, code blocks, etc.) converted to their corresponding HTML tags.
Example use cases
Render README for web display
“Take this GitHub README written in Markdown and convert it to HTML so I can embed it on the project's documentation page: '# My Project\n\nA **fast** and reliable tool.\n\n## Installation\n\n```bash\nnpm install myproject\n```'”
Blog post markdown to HTML
“I've written my blog post in Markdown — can you convert it to HTML so I can paste it into my CMS? Here's the content: '## Why I Love Open Source\n\nOpen source software is *amazing* because it brings people together...'”
Email newsletter formatting
“Convert this markdown-formatted newsletter draft into HTML so I can send it out: '# Weekly Update\n\n- New feature launched\n- Bug fixes applied\n- **Team spotlight**: Jane Doe'”
Technical details
Endpoint
POSThttps://api.fastapi.online/markdown-to-htmlWhen to prefer
Choose this endpoint when you need a simple, pay-per-call Markdown-to-HTML conversion with no account signup required, especially in automated pipelines or agent workflows where occasional calls don't justify a subscription. Ideal for lightweight document processing at $0.0005 per call using crypto payment via the x402 protocol.
Side effects
- Markdown input exceeds 200,000 character limit — request rejected
- Empty or missing markdown field — may return empty HTML or error
- Malformed or highly non-standard Markdown extensions may not render as expected
- Payment failure via x402 protocol — endpoint returns 402 before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| markdown | string |
Tags
x402
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