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Web URL Context Compressor
Web URL Context Compressor is a paid API for AI agents from prompt-guard.agentdiet.dev, paid per call via MPP, $0.001/call, status unknown (last checked 2026-10-21).
Fetches and distills a URL or raw HTML into compact, agent-ready tokens using BM25 budget control and multiple extraction 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://prompt-guard.agentdiet.dev/v1/context-compress)
Output
Returns a JSON object with a 'data' field containing the distilled content (markdown, structured tables, skeleton, or BM25 excerpt depending on mode), plus an 'roi_proof' object showing raw token count, distilled token count, tokens saved, compression ratio percentage, ROI multiplier, and estimated LLM cost saved in USD. Also includes cache hit/miss status and billing details.
Example use cases
LLM context injection from docs page
“Distill https://docs.openai.com/api-reference into structured markdown so I can inject it into my agent's context window without blowing the token limit.”
Topic-focused budget compression for research
“Compress https://en.wikipedia.org/wiki/Transformer_(machine_learning_model) in budget mode with the query 'attention mechanism' and cap it at 500 tokens — I only need the relevant parts.”
Skeleton outline of a long article
“Grab https://a16z.com/ai-predictions-2025 and give me a skeleton outline of the page structure so I can quickly see what sections are covered.”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/context-compress?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to inject web content into a prompt but must stay within a token budget — particularly when BM25 query-focused extraction or structured/skeleton modes are needed. Prefer over generic scraping tools when compression ratio and token savings ROI matter, or when the agent needs deterministic token ceilings via max_tokens.
Side effects
- URL is unreachable or returns non-200 — endpoint may error or return empty distillation
- max_tokens set below minimum of 20 — schema validation error
- mode=budget used without a query parameter — may produce generic compression rather than focused output
- Raw HTML input too large — may exceed processing limits
- Payment failure via x402 — endpoint returns HTTP 402 and does not process the request
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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