Docs, Pricing, And Policy Monitors

Give your agent a paid fallback for fresh public pages.

FetchDelta is built for agents that watch docs, release notes, pricing, and policy pages. Start with a free preview on the exact page you care about, then buy one fresh resolve or diff over plain HTTPS only when the sample is worth it.

Open Quickstart Inspect 402 Flow Inspect Manifest
Base mainnet x402 $0.002 resolve $0.004 diff Public web only Good for docs and changelogs
500 resolve calls per $1
250 diff calls per $1
402 native paywall, not API-key lock-in

Agent Buying Flow

1. Point it at one page that already matters Start with a docs, release-note, pricing, or policy page that already shows up in your workflow.
2. Pull a free preview first Fetch the title, excerpt, headings, links, and a markdown sample before you decide to pay for the full response.
3. Upgrade only if the sample is worth it Then use x402 on Base for the full resolve or switch repeated checks to diff. 
curl 'https://fetchdelta.com/api/resolve/preview?url=https%3A%2F%2Fexample.com%2Fpost'

# if the sample looks good, pay for the full resolve
curl -i 'https://fetchdelta.com/api/resolve?url=https%3A%2F%2Fexample.com%2Fpost'

Why This Is Easier Than Homegrown Crawling

No crawler maintenance HTML cleanup, parser tuning, and change-state storage are already handled.
No always-on job just to catch one change Pay per request when a workflow actually needs fresh page state.
No human-oriented auth flow Discovery docs are public and the paid path is plain HTTP.

Best First Buyers

Docs copilots that sometimes need a fresh page

When an agent is about to answer from stale docs context, buy one clean markdown fetch instead of keeping a browser and scraper pipeline alive.

Release-note and changelog watchers

Ask whether a watched page changed since the last fetch and get structured adds, removals, and a short preview instead of reparsing the full document every time.

Policy or pricing monitors

No monthly data contract is required. If an agent only needs five checks today, it pays for five checks today.

Try your URL free Good for docs watchers Good for pricing and policy pages Good for release notes and changelogs

Copy-Paste Entry Points

GET https://fetchdelta.com/preview

GET https://fetchdelta.com/api/resolve?url=https%3A%2F%2Fexample.com%2Fpost

GET https://fetchdelta.com/api/diff?url=https%3A%2F%2Fexample.com%2Fpost

GET https://fetchdelta.com/manifest
GET https://fetchdelta.com/openapi.json
GET https://fetchdelta.com/llms.txt
GET https://fetchdelta.com/health

Agent Buyer Example

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

const account = privateKeyToAccount(process.env.EVM_PRIVATE_KEY);
const paidFetch = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:*", client: new ExactEvmScheme(account) }],
});

const response = await paidFetch("https://fetchdelta.com/api/resolve?url=https%3A%2F%2Fexample.com%2Fpost");
const data = await response.json();

What To Test First

  • Give a docs copilot a cheap fallback when it needs the current public page in clean markdown
  • Track release notes, changelogs, and policy pages without rebuilding a crawler stack
  • Watch pricing pages or listings and pay only when an agent actually needs a fresh check

Resolve Endpoint

$0.002
500 resolve calls per $1

Fetch a public page and return clean markdown plus metadata for agent use.

{
  "url": "https://example.com/post",
  "title": "Example title",
  "excerpt": "Short summary.",
  "markdown": "# Example title",
  "headings": [
    "Example title"
  ]
}

Diff Endpoint

$0.004
250 diff calls per $1

Fetch a public page, compare it to the previous snapshot, and return structured changes.

{
  "url": "https://example.com/post",
  "baselineCreated": false,
  "hasChanges": true,
  "addedLines": 3,
  "removedLines": 1,
  "preview": [
    {
      "type": "added",
      "text": "New paragraph"
    }
  ]
}