# SPA Markdown Reader with BM25 Budget Control

> SPA Markdown Reader with BM25 Budget Control is a paid API for AI agents from whale-momentum.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 Markdown, structured JSON, or a BM25-focused token-budgeted excerpt for agent consumption

## Facts

- Endpoint: POST https://whale-momentum.agentdiet.dev/v1/spa-markdown-reader?utm_source=zero.xyz
- Price: $0.001/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: whale-momentum.agentdiet.dev
- Website: https://whale-momentum.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/whale-momentum-agentdiet-dev-spa-markdown-reader-with-bm25-budget-3c461496
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IWOc_NAnDam2Q0su3R1z5

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 whale-momentum-agentdiet-dev-spa-markdown-reader-with-bm25-budget-3c461496 -d '<json body>'
```

Example prompt: Fetch https://stripe.com/docs/payments and distill it into markdown using budget mode, focusing on 'webhook event types', and keep it under 500 tokens.

## When to prefer this

Choose this endpoint when your agent needs to read web pages or raw HTML but must stay within strict token budgets, or when you need BM25-ranked relevance filtering to extract only the content pertinent to a specific query. It is especially useful for LLM pipelines where token cost matters, for SPA-heavy sites that need server-side distillation, and when you want structured JSON tables or a skeleton outline rather than raw HTML. Prefer it over generic scrapers when compression ratio and ROI proof are important for your agent's cost accounting.

## Known failure modes

- URL unreachable or returns non-200 — fetch failure with error status
- HTML too large and no token budget set — may exceed context limits
- BM25 query missing when mode=budget — query field required for budget mode
- Invalid URL format — validation error on url field
- SPA with heavy JavaScript rendering may not fully execute — partial content returned
- Token budget too low (below 20) — rejected by schema validation

## How this service works

Distill a URL or raw HTML payload with BM25 budget control (Live x402 v2, IETF MPP & MCP endpoint at https://whale-momentum.agentdiet.dev/v1/spa-markdown-reader)

## Output

Returns a status field, distilled content object (Markdown text, structured JSON tables/metadata, skeleton outline, or BM25-ranked excerpt depending on mode), ROI proof metrics (raw_tokens, distilled_tokens, tokens_saved, compression_ratio_pct, llm_cost_saved_usd, roi_multiplier), optional cache status (HIT/MISS with latency), 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/whale-momentum-agentdiet-dev-spa-markdown-reader-with-bm25-budget-3c461496/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whale-momentum.agentdiet.dev](https://www.zero.xyz/host/whale-momentum.agentdiet.dev/llms.txt)