# Web Distillation with BM25 Budget Control (RAG Chunk)

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

Fetches and distills a URL or raw HTML into compact, agent-ready tokens with BM25-ranked budget control for precise context-window management

## Facts

- Endpoint: POST https://alpha-stream.agentdiet.dev/v1/rag-chunk?utm_source=zero.xyz
- Price: $0.001/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: alpha-stream.agentdiet.dev
- Website: https://alpha-stream.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/alpha-stream-agentdiet-dev-web-distillation-with-bm25-budget-control-c5e6da85
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PnKs3Cpke2_OYRWwfqykC

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 alpha-stream-agentdiet-dev-web-distillation-with-bm25-budget-control-c5e6da85 -d '<json body>'
```

Example prompt: Distill the content at https://stripe.com/docs/payments/payment-intents into compact markdown using budget mode, focused on the query 'how to create a payment intent', and keep it under 500 tokens.

## When to prefer this

Choose this endpoint when you need to fit web content into a strict LLM context window and want precise token-budget control with BM25 relevance ranking. It is especially valuable for RAG pipelines where you need the most query-relevant content from a long page, not just a naive truncation. Prefer it over generic scraping tools when you need quantified compression metrics (tokens saved, cost saved) to track efficiency. Use the 'budget' mode with a query and max_tokens when context is scarce; use 'markdown' or 'structured' modes when you want clean reformatting without a hard token cap.

## Known failure modes

- URL is unreachable or returns a non-200 status — endpoint may return an error status
- HTML payload is malformed or empty — distillation may fail or return minimal output
- max_tokens set too low (below 20) — rejected by schema validation
- BM25 query provided but mode is not 'budget' — query may be ignored
- Rate limiting or payment failure via x402 — request blocked without valid payment
- Target site blocks scraping (e.g. Cloudflare) — fetch may fail or return partial content

## How this service works

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

## Output

Returns a JSON object with a 'data' field containing the distilled content in the requested format (markdown, structured JSON, skeleton, or BM25 excerpt), an 'roi_proof' object showing raw token count, distilled token count, tokens saved, compression ratio percentage, and estimated LLM cost saved in USD, plus 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/alpha-stream-agentdiet-dev-web-distillation-with-bm25-budget-control-c5e6da85/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from alpha-stream.agentdiet.dev](https://www.zero.xyz/host/alpha-stream.agentdiet.dev/llms.txt)