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Semantic HTML Pruner – Web URL Distillation API
Semantic HTML Pruner – Web URL Distillation API is a paid API for AI agents from preflight.agentdiet.dev, paid per call via MPP, $0.001/call, status unknown (last checked 2026-10-21).
Fetches a URL or accepts raw HTML and compresses it into compact, agent-ready tokens using BM25-ranked budget control and multiple distillation modes
Price / call$0.001
Success—
StatusUnknown
How this service works
Distill a URL or raw HTML payload with BM25 budget control (Live x402 v2, IETF MPP & MCP endpoint at https://preflight.agentdiet.dev/v1/semantic-html-pruner)
Output
Returns a JSON object containing distilled content (Markdown, structured tables/metadata, skeleton outline, or BM25-ranked excerpt depending on mode), ROI proof metrics (raw tokens, distilled tokens, tokens saved, compression ratio, estimated LLM cost saved), optional cache status (HIT/MISS), billing details, and an execution status field.
Example use cases
Token-efficient competitor research
“Fetch https://www.openai.com/pricing and distill it into structured markdown so I can compare their pricing tiers without blowing my context window.”
BM25-focused SEC filing extraction
“Pull https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=AAPL&type=10-K and extract only the sections about revenue and risk factors, using budget mode with a max of 1500 tokens and query 'revenue risk factors'.”
Skeleton outline of documentation site
“Give me a skeleton outline of https://docs.anthropic.com/en/docs/welcome so I can see the structure of their documentation without reading the full text.”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/semantic-html-pruner?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to read web content that would otherwise exceed context window limits or drive up LLM token costs. It is especially valuable when working with long documentation pages, news articles, or SEC filings where only a subset of content is needed. Prefer this over raw HTTP fetching when token efficiency matters, or when you want structured/skeleton output rather than raw HTML noise. The BM25 budget mode is uniquely suited for topic-focused extraction within a strict token ceiling.
Side effects
- Invalid or unreachable URL returns an error status
- HTML too large or malformed may cause incomplete distillation
- budget mode without a query returns unranked content
- max_tokens set too low may truncate critical content
- Rate limiting or payment failure (402) blocks the request
- Target site blocks automated fetching (bot protection)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlrequired | string | Target webpage URL to fetch and distill (or builtin://stripe-docs) |
| html | string | Optional raw HTML string to distill directly without fetching |
| mode | string | Distillation mode |
| query | string | BM25 focus query when mode=budget |
| max_tokens | integer | Strict token budget ceiling when mode=budget |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| datarequired | object | Distilled Markdown, structured JSON tables/metadata, skeleton outline, or BM25 budget excerpt. |
| cache | object | |
| statusrequired | string | Execution status ('ok') |
| billing | object | |
| roi_proofrequired | object |
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