# POST /page/changes/summary: $0.008 per call

Page change detection with an AI summary: like /page/changes (send back the token from your last check), plus a two-sentence summary of what changed and whether it looks significant (price, policy, product or content change) versus noise. POST {url, token}.

- **Price:** $0.008 in USDC, the same on Base, Solana, Polygon, Arbitrum. Failed calls are never charged.
- **Free trial:** yes, 20 free calls a day from Claude, Cursor or any MCP client ([set-up](/mcp/setup)).
- **Tier:** deep
- **Answers cached for:** not cached
- **Data sources:** The page itself; Workers AI (metered, only when the page changed)
- **Lane:** Web search and crawling ([OpenAPI](/openapi/web-search.json))
- **Live health:** [status page](/status)

## Free sample

See an answer for the demo input first, free (no payment, 10 a minute): [https://aayatai.com/sample/page-changes-summary](/sample/page-changes-summary). It is a stored real answer when we have one, otherwise an example marked `"kind": "illustrative"`.

```bash
curl "https://aayatai.com/sample/page-changes-summary"
```

## 1. See the price (free)

Call it without paying: you get `402 Payment Required` and a `PAYMENT-REQUIRED` header with the exact price and where to pay.

```bash
curl -i -X POST https://aayatai.com/page/changes/summary -H "content-type: application/json" -d '{"url":"https://example.org/"}'
```

## 2. Pay and call (TypeScript)

```bash
npm install @x402/fetch @x402/evm viem
```

```ts
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

// A wallet used only by your agent, holding a little USDC on Base.
const account = privateKeyToAccount(process.env.WALLET_PRIVATE_KEY as `0x${string}`);
const pay = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(account) }],
});

const res = await pay("https://aayatai.com/page/changes/summary", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"url":"https://example.org/"}),
});
console.log(await res.json());
```

## 3. Or as an MCP tool

```ts
// MCP server: https://aayatai.com/mcp (Streamable HTTP). With the x402 MCP client (see /start):
const result = await client.callTool("page-changes-summary", {"url":"https://example.org/"});
```

## Inputs

- `url` **(required)** (string): The page to watch.
- `token` (string): The token from your previous check of this page (omit on the first check).
- `ignoreNumbers` (boolean; default `false`): Treat changes that only touch numbers (counters, timestamps, prices) as no change. Set on the first check; the token remembers it.

Bad inputs are rejected with HTTP 400 before any payment is asked for.

## Example answer

```json
{
  "url": "https://example.org/",
  "title": "Example Org",
  "firstCheck": false,
  "changed": true,
  "previousCheckAt": "2026-09-27T12:00:00.000Z",
  "hash": "3f2a9c...",
  "blocks": 12,
  "added": [
    "New: we now ship examples in Welsh."
  ],
  "addedCount": 1,
  "removed": [
    "Welcome to the example organisation. Wel"
  ],
  "removedCount": 1,
  "token": "fZDNasMwEIRfxey5...",
  "note": null,
  "checkedAt": "2026-09-28T12:00:00.000Z",
  "summary": "A new paragraph announces Welsh examples; the welcome text was reworded. Minor content update."
}
```

## Related

- [GET /search/open](/services/search-open) ($0.002): Cheapest search: Wikipedia articles, Hacker News stories, DuckDuckGo instant answers and Stack Overflow questions in one call, merged, de-duplicated and ranked,
- [GET /search](/services/search) ($0.003): Live search, open-sources tier: fresh results from Wikipedia, Hacker News, DuckDuckGo instant answers and Stack Overflow, merged, de-duplicated and ranked (titl
- [GET /search/answer](/services/search-answer) ($0.03): Search, read and summarise in one call (open-sources tier): finds pages via Wikipedia, Hacker News, DuckDuckGo and Stack Overflow, reads the top ones (robots.tx
- [GET /metadata](/services/metadata) ($0.002): A web page's metadata in one cheap call: title, description, canonical URL, language, site name, preview image, OpenGraph and Twitter card tags, author and date
- [GET /feed](/services/feed) ($0.003): Latest posts from any site or feed as clean JSON: pass a feed URL or just the site's address and we find its RSS, Atom or JSON Feed (from the page's links or co
- [POST /page/changes](/services/page-changes) ($0.002): Watch any public page for changes: we fetch it now (robots.txt respected), fingerprint its text and return a token.
- [GET /product](/services/product) ($0.003): Product and price from any public product page, as clean JSON: name, brand, price, currency, availability, condition, SKU/GTIN, seller, rating and image, read f
- [GET /product/ai](/services/product-ai) ($0.01): Product and price from any public product page, even without structured data: uses the page's schema.org/OpenGraph data when present, otherwise AI reads the pag

New here? [Getting started in 60 seconds](/start). All services: [Aayat AI](/).