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FastX402 Markdown Heading Tree
x402
FastX402 Markdown Heading Tree is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.002/call, status down (last checked 2026-10-30).
Parses a Markdown document and returns its heading hierarchy as a nested tree structure with slugs, text, and levels
Price / call$0.002
Success—
StatusDown
How this service works
216 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
A JSON object containing a 'headings' array of nested heading nodes, each with 'text' (the heading content), 'level' (1–6), 'slug' (URL-safe anchor), and 'children' (an array of sub-headings at the next level down), forming a complete recursive tree of the document structure.
Example use cases
Auto-generate docs table of contents
“I have a long README.md file and I need to build a table of contents from it — can you extract all the headings as a nested outline so I can see the structure at a glance?”
Validate document structure before publishing
“Before I publish this markdown article, can you pull out all the headings and show me the hierarchy so I can check whether the sections are organized logically?”
Build site navigation from markdown pages
“I'm building a static site and I need to generate a sidebar navigation menu — can you extract the heading tree from this markdown page so I can use the slugs and levels to build the nav links?”
Technical details
Endpoint
GEThttps://fastx402.tools/markdown-heading-tree?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a structured, nested heading tree from a Markdown document — especially when you need slugs for anchor links, or need to traverse the document hierarchy programmatically. It is ideal for building table-of-contents components, navigation menus, or document outlines without writing your own markdown parser. No API key required — pay $0.002 USDC per call via x402.
Side effects
- Empty or missing 'markdown' query parameter returns an error
- Markdown with no headings returns an empty headings array
- Malformed markdown may produce unexpected heading extraction
- Very large markdown documents may hit query parameter length limits
- Non-markdown content passed as input may return empty or partial results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"headings": [
{
"slug": "introduction",
"text": "Introduction",
"level": 1,
"children": [
{
"slug": "getting-started",
"text": "Getting Started",
"level": 2,
"children": [
{
"slug": "installation",
"text": "Installation",
"level": 3,
"children": []
},
{
"slug": "configuration",
"text": "Configuration",
"level": 3,
"children": []
}
]
},
{
"slug": "api-reference",
"text": "API Reference",
"level": 2,
"children": []
}
]
},
{
"slug": "conclusion",
"text": "Conclusion",
"level": 1,
"children": []
}
]
}
}Tags
x402
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