# Web URL Prompt Compressor with BM25 Budget Control

> Web URL Prompt Compressor with BM25 Budget Control is a paid API for AI agents from shopify-spy.agentdiet.dev, paid per call via MPP, $0.001/call, status unknown (last checked 2026-10-21).

Fetches a webpage or raw HTML and distills it into compact, agent-ready tokens using multiple extraction modes including BM25-focused budget excerpts

## Facts

- Endpoint: GET https://shopify-spy.agentdiet.dev/v1/prompt-compress?utm_source=zero.xyz
- Price: $0.001/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: shopify-spy.agentdiet.dev
- Website: https://shopify-spy.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/shopify-spy-agentdiet-dev-web-url-prompt-compressor-with-bm25-budget-5957daf1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_T0SnkxCo2OJnGTPBdxcM2

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 shopify-spy-agentdiet-dev-web-url-prompt-compressor-with-bm25-budget-5957daf1
```

Example prompt: Fetch the Stripe pricing page at https://stripe.com/pricing and distill it into compact markdown within a 500-token budget, focusing on the query 'payment fees'.

## When to prefer this

Choose this endpoint when you need to shrink web page content before injecting it into an LLM prompt, especially when operating under strict token budgets. It is ideal for agentic pipelines that must read live web pages without exhausting context windows, and when you want ROI proof of token savings. Prefer it over generic scrapers when you need BM25-focused relevance filtering around a specific query topic.

## Known failure modes

- Invalid or unreachable URL returns an error status
- Token budget too small (max_tokens below 20) triggers validation error
- BM25 query mode requested without a query string may return unfiltered content
- Rate limiting or payment failure via x402 blocks the request
- Raw HTML field and URL field both omitted results in missing required parameter error

## How this service works

Distill a URL or raw HTML payload with BM25 budget control (Live x402 v2, IETF MPP & MCP endpoint at https://shopify-spy.agentdiet.dev/v1/prompt-compress)

## Output

Returns a JSON object with a 'data' field containing the distilled content (markdown, structured tables, skeleton, or BM25 excerpt), an 'roi_proof' object showing raw vs distilled token counts, compression ratio, and estimated LLM cost saved, plus optional cache 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/shopify-spy-agentdiet-dev-web-url-prompt-compressor-with-bm25-budget-5957daf1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from shopify-spy.agentdiet.dev](https://www.zero.xyz/host/shopify-spy.agentdiet.dev/llms.txt)