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Web URL Context Compressor
Web URL Context Compressor 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 web page and distills it into compact, token-efficient agent-ready content using multiple extraction modes (markdown, structured, skeleton, or BM25-budget)
Price / call$0.001
Success—
StatusUnknown
How this service works
Distill a web URL into compact agent-ready tokens (Live x402 v2, IETF MPP & MCP endpoint at https://preflight.agentdiet.dev/v1/context-compress)
Output
Returns a data object containing the distilled content (markdown, structured JSON, skeleton outline, or BM25 excerpt depending on mode), plus an roi_proof block showing raw vs distilled token counts, tokens saved, compression ratio percentage, and estimated LLM cost saved in USD. Also includes cache hit/miss status and billing details.
Example use cases
Fit long docs into context window
“Grab https://docs.openai.com/guides/function-calling and compress it into skeleton mode so I can load the outline into my context window without blowing my token budget.”
Focused keyword extraction from a webpage
“Pull https://news.ycombinator.com and give me a budget excerpt focused on 'AI agents', capped at 300 tokens.”
Structured data extraction from a product page
“Distill https://www.stripe.com/pricing into structured mode so I can get the pricing tiers and feature tables in a clean JSON format.”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/context-compress?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to ingest web page content but must stay within a token budget or minimize LLM inference costs. It is especially useful when the raw HTML or full markdown of a page would be too large to fit in a context window. Prefer it over raw web scraping tools when you need token-count guarantees (budget mode with max_tokens), keyword-focused excerpts (BM25 mode), or clean structured tables from a page. Also prefer it when cost efficiency matters — the roi_proof field lets agents verify the compression ROI before deciding how to use the output.
Side effects
- URL is unreachable or returns a non-200 response — endpoint may return an error status
- URL content is empty or has no extractable text — distilled output may be minimal
- BM25 query provided without mode=budget — query parameter ignored silently
- max_tokens too low to fit any meaningful content — may return truncated or empty excerpt
- Payment failure via x402 — request not fulfilled if USDC payment not completed
- Invalid URL format — validation error on required url parameter
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlrequired | string | Target webpage URL to distill (or builtin://stripe-docs) |
| mode | string | Extraction mode: markdown, structured, skeleton, or budget |
| query | string | BM25 focus query when mode=budget |
| max_tokens | integer | Strict token 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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