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x402-gateway: EPUB to Markdown Converter
x402
x402-gateway: EPUB to Markdown Converter is a paid API for AI agents from x402.freeq.one, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).
Converts an EPUB e-book (via URL or base64-encoded bytes) into clean, structured Markdown with chapters as headings and metadata included
Price / call$0.005
Success—
StatusUnknown
How this service works
EPUB to Markdown: Convert an EPUB e-book to clean Markdown. Provide a direct URL or base64-encoded file bytes. Chapters become headings; metadata (title, author) is included. Feed whole books into LLM context or RAG. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/epub_to_markdown.
Output
A JSON object with a 'result' field containing the full Markdown text of the EPUB, with chapters rendered as headings and book metadata (title, author) included at the top. Output may be truncated to max_length characters if specified.
Example use cases
Ingest book into RAG pipeline
“Grab the epub at https://example.com/my-textbook.epub and convert it to Markdown so I can chunk it and load it into my RAG knowledge base — keep it under 150000 characters.”
Feed entire novel into LLM context
“I have an epub encoded in base64 — convert it to clean Markdown with chapters as headings so I can paste the whole thing into my LLM's context window.”
Extract book metadata and content
“Convert this epub from https://example.org/science-of-everything.epub to Markdown and include the title and author at the top — I want to archive it in a readable format.”
Technical details
Endpoint
POSThttps://x402.freeq.one/tools/epub_to_markdown?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to convert an EPUB e-book into LLM-ready Markdown, especially for RAG ingestion or feeding entire books into LLM context windows. Prefer it over generic document converters when your source is specifically an EPUB file and you want structured chapter headings preserved. The sibling 'Document to Markdown (auto-detect)' endpoint is better if you're unsure of the file format.
Side effects
- Invalid or unreachable EPUB URL returns an error
- Base64-encoded content too large (>28MB) is rejected
- Non-EPUB file format at the URL causes a parse failure
- Payment not included or insufficient USDC causes 402 rejection
- Malformed base64 string causes decoding error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Direct URL to the EPUB file |
| file_b64 | string | Base64-encoded EPUB bytes (alternative to url) |
| max_length | integer | Truncate output to N characters |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {}
}
}Tags
x402
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