# Web URL Context Compressor (BM25 Budget Control)

> Web URL Context Compressor (BM25 Budget Control) is a paid API for AI agents from x402broker.com, paid per call via MPP, $0.001/call, status unknown (last checked 2026-10-21).

Fetches and distills a web URL or raw HTML into compact, agent-ready tokens using configurable modes including BM25 budget-controlled excerpts

## Facts

- Endpoint: GET https://x402broker.com/v1/context-compress?utm_source=zero.xyz
- Price: $0.001/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: x402broker.com
- Website: https://x402broker.com
- Canonical page: https://www.zero.xyz/c/x402broker-com-web-url-context-compressor-bm25-budget-control-b83c932d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ztVhZbu5DjRZ9p63npQmD

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 x402broker-com-web-url-context-compressor-bm25-budget-control-b83c932d
```

Example prompt: Can you distill https://stripe.com/docs/api into compact markdown and keep it under 2000 tokens using budget mode, focused on payment intents?

## When to prefer this

Choose this endpoint when an AI agent needs to read a web page but must stay within a token budget, or when raw HTML is too noisy and verbose for direct LLM consumption. It is especially valuable when using BM25 mode to focus on a specific topic within a large document, or when structured/skeleton modes are needed to extract tables and outlines efficiently. Prefer it over raw web scraping when token cost reduction and LLM-ready output formatting matter.

## Known failure modes

- URL is unreachable or returns non-200 status — endpoint may return an error status
- HTML payload too large or malformed — distillation may fail or truncate
- max_tokens set below minimum of 20 — schema validation error
- BM25 query provided without mode=budget — query may be ignored
- Rate limiting or payment failure via x402 — HTTP 402 returned if funds insufficient
- URL behind authentication/paywalls — fetched content may be login page instead of target

## How this service works

Distill a URL or raw HTML payload with BM25 budget control (Live x402 v2, IETF MPP & MCP endpoint at https://x402broker.com/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 vs distilled token counts, tokens saved, compression ratio percentage, and estimated LLM cost saved in USD. Also includes cache status (HIT/MISS) 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/x402broker-com-web-url-context-compressor-bm25-budget-control-b83c932d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402broker.com](https://www.zero.xyz/host/x402broker.com/llms.txt)