# RAG Diet – BM25 Budget-Controlled Web Distillation

> RAG Diet – BM25 Budget-Controlled Web Distillation is a paid API for AI agents from serp-extract.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 compact, token-budgeted agent-ready content using BM25 ranking with multiple output modes

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/rag-diet?utm_source=zero.xyz
- Price: $0.001/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: serp-extract.agentdiet.dev
- Website: https://serp-extract.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/serp-extract-agentdiet-dev-rag-diet-bm25-budget-controlled-web-bff38d08
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0HxobDMdwaEOZt6yIOMtT

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 serp-extract-agentdiet-dev-rag-diet-bm25-budget-controlled-web-bff38d08 -d '<json body>'
```

Example prompt: Can you fetch https://stripe.com/docs/payments and distill it using budget mode with the query 'payment intents API' and a max of 500 tokens, so I only get the most relevant content without blowing my context window?

## When to prefer this

Choose this endpoint when you need to pass web content to an LLM but want to minimize token usage and cost — especially when a specific query focus is known (use budget+BM25 mode) or when you need structured extraction rather than raw HTML. It is superior to generic scrapers when token budgeting, compression ratio reporting, and LLM cost savings matter, and uniquely supports raw HTML input without re-fetching.

## Known failure modes

- URL is unreachable or returns non-200 status — fetch fails with error status
- HTML payload is empty or malformed — distillation returns minimal/empty data
- max_tokens set too low (below 20) — rejected by schema validation
- BM25 query not provided when mode=budget — may return unfiltered or empty results
- Payment not included or insufficient — HTTP 402 response blocking execution
- Rate limiting or timeout on slow target URLs

## How this service works

Distill a URL or raw HTML payload with BM25 budget control (Live x402 v2, IETF MPP & MCP endpoint at https://serp-extract.agentdiet.dev/v1/rag-diet)

## Output

Returns a JSON object containing the distilled content (markdown, structured JSON, skeleton, or BM25 excerpt depending on mode), an ROI proof block showing raw vs distilled token counts, compression ratio, tokens saved, and estimated LLM cost saved in USD, plus 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/serp-extract-agentdiet-dev-rag-diet-bm25-budget-controlled-web-bff38d08/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from serp-extract.agentdiet.dev](https://www.zero.xyz/host/serp-extract.agentdiet.dev/llms.txt)