# Web Page & HTML Distillation with BM25 Budget Control

> Web Page & HTML Distillation with BM25 Budget Control is a paid API for AI agents from prompt-guard.agentdiet.dev, paid per call via MPP, $0.001/call, status unknown (last checked 2026-10-23).

Fetches a URL or accepts raw HTML and distills it into Markdown, structured JSON, a skeleton outline, or a BM25-ranked token-budgeted excerpt optimized for LLM consumption.

## Facts

- Endpoint: POST https://prompt-guard.agentdiet.dev/v1/docs-to-markdown?utm_source=zero.xyz
- Price: $0.001/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: prompt-guard.agentdiet.dev
- Website: https://prompt-guard.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/prompt-guard-agentdiet-dev-web-page-html-distillation-with-bm25-6e33fc8e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_G5VstnjoyUirzK1AjmouZ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability prompt-guard-agentdiet-dev-web-page-html-distillation-with-bm25-6e33fc8e -d '<json body>'
```

Example prompt: Fetch the Stripe docs page at https://stripe.com/docs/api/charges and distill it into markdown, keeping it under 800 tokens and focused on the query 'charge creation parameters' — use budget mode.

## When to prefer this

Choose this endpoint when you need to feed live web content or raw HTML to an LLM and want to minimize token usage and cost. It is especially valuable when working with large documentation pages, e-commerce catalogs, or arbitrary URLs where boilerplate removal and BM25-focused budgeting are needed. Prefer it over generic scraping tools when token economy and structured output (Markdown, JSON tables, skeleton) matter, or when you need provable ROI metrics on compression.

## Known failure modes

- URL is unreachable or returns non-200 HTTP — endpoint may return an error status
- HTML payload too large to process within token constraints
- BM25 query yields no relevant passages, returning minimal or empty excerpt
- Invalid mode enum value causes a 422 validation error
- max_tokens set too low (below 20) triggers minimum constraint error
- Payment not provided or insufficient — HTTP 402 returned requiring x402 USDC payment

## 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/docs-to-markdown)

## Output

Returns a JSON object with a 'data' field containing the distilled content (Markdown string, structured JSON tables/metadata, skeleton outline, or BM25-ranked excerpt depending on mode), plus an 'roi_proof' object showing raw_tokens, distilled_tokens, tokens_saved, compression_ratio_pct, and llm_cost_saved_usd. Also includes optional cache hit/miss status and billing details.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "minLength": 1,
   "description": "Target webpage URL to fetch and distill (or builtin://stripe-docs)"
  },
  "html": {
   "type": "string",
   "description": "Optional raw HTML string to distill directly without fetching"
  },
  "mode": {
   "enum": [
    "markdown",
    "structured",
    "skeleton",
    "budget"
   ],
   "type": "string",
   "default": "markdown",
   "description": "Distillation mode"
  },
  "query": {
   "type": "string",
   "description": "BM25 focus query when mode=budget"
  },
  "max_tokens": {
   "type": "integer",
   "minimum": 20,
   "description": "Strict token budget ceiling when mode=budget"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "status",
  "roi_proof",
  "data"
 ],
 "properties": {
  "data": {
   "type": "object",
   "description": "Distilled Markdown, structured JSON tables/metadata, skeleton outline, or BM25 budget excerpt."
  },
  "cache": {
   "type": "object",
   "properties": {
    "status": {
     "enum": [
      "HIT",
      "MISS"
     ],
     "type": "string"
    },
    "cache_key": {
     "type": "string"
    },
    "latency_ms": {
     "type": "number"
    }
   }
  },
  "status": {
   "type": "string",
   "description": "Execution status ('ok')"
  },
  "billing": {
   "type": "object",
   "properties": {
    "agent_id": {
     "type": "string"
    },
    "payment_method": {
     "type": "string"
    },
    "fee_charged_usd": {
     "type": "number"
    }
   }
  },
  "roi_proof": {
   "type": "object",
   "properties": {
    "raw_tokens": {
     "type": "integer"
    },
    "tokens_saved": {
     "type": "integer"
    },
    "roi_multiplier": {
     "type": "number"
    },
    "distilled_tokens": {
     "type": "integer"
    },
    "llm_cost_saved_usd": {
     "type": "number"
    },
    "compression_ratio_pct": {
     "type": "number"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/prompt-guard-agentdiet-dev-web-page-html-distillation-with-bm25-6e33fc8e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from prompt-guard.agentdiet.dev](https://www.zero.xyz/host/prompt-guard.agentdiet.dev/llms.txt)