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Buy one page audit: 0.25 USDC

This is a developer purchase flow using Node 24+ and a dedicated wallet already funded with USDC on Base mainnet. For one page, you can also use the browser wallet checkout with a supported browser wallet. You receive AEO evidence, SEO checks, readability measurements and a Markdown report. Read the free fixed sample first.

Current deployment network: eip155:8453. Configured recipient: 0xCBA2f3E55B05894EA8787779cc942cE02Cc64E4C. Before buying, compare this recipient with an independently trusted merchant listing or confirmation. Matching this page to its own quote alone is not independent verification. The buyer checks that its quote uses your selected recipient, Base USDC and exactly 0.25 USDC.

1. Create a private working folder and get a free quote

Run one of these blocks from a private folder outside any public repository or shared/synced directory. Use a new folder for each intended purchase. Inspect the downloaded script before using a key. The quote command needs no key, signs nothing and makes no payment. Confirm the URL, amount, network and recipient in its output.

umask 077
mkdir agentpage402-audit
cd agentpage402-audit
npm init -y
npm install --save-exact @x402/core@2.28.0 @x402/evm@2.28.0 viem@2.57.7
curl --fail --location --output buyer-example.mjs 'https://agentpage402-demo.onrender.com/buyer-example.mjs'

# Replace this with the public page you want to inspect.
export BUYER_URL='https://example.com/'
export BUYER_SERVICE='page-audit'
export BUYER_MAX_USDC='0.25'
# Confirm the recipient independently before using --buy.
export BUYER_PAY_TO='0xCBA2f3E55B05894EA8787779cc942cE02Cc64E4C'
node buyer-example.mjs --quote

New-Item -ItemType Directory -Path agentpage402-audit -ErrorAction Stop
Set-Location -LiteralPath agentpage402-audit
npm init -y
npm install --save-exact @x402/core@2.28.0 @x402/evm@2.28.0 viem@2.57.7
Invoke-WebRequest -Uri 'https://agentpage402-demo.onrender.com/buyer-example.mjs' -OutFile buyer-example.mjs

# Replace this with the public page you want to inspect.
$env:BUYER_URL = 'https://example.com/'
$env:BUYER_SERVICE = 'page-audit'
$env:BUYER_MAX_USDC = '0.25'
# Confirm the recipient independently before using --buy.
$env:BUYER_PAY_TO = '0xCBA2f3E55B05894EA8787779cc942cE02Cc64E4C'
node buyer-example.mjs --quote

2. Explicitly buy once

Only continue after the quote matches the page you intend to audit and your recipient check. The limit is explicitly 0.25 USDC. Use a dedicated funded buyer wallet; never use the merchant wallet. Enter its private key only into the local terminal prompt below, never into this website, support, chat or a public file. Do not enter a seed phrase. The existing buyer verifies the balance and payment terms before signing.

(
  # The key stays in this local process; input is not echoed or stored in history.
  trap 'stty echo' 0
  trap 'exit 130' HUP INT TERM
  printf 'Dedicated buyer wallet private key (local only): '
  stty -echo || exit 1
  IFS= read -r BUYER_PRIVATE_KEY || exit 1
  stty echo
  printf '\n'
  export BUYER_PRIVATE_KEY
  node buyer-example.mjs --buy
)

$buyerSecret = Read-Host 'Dedicated buyer wallet private key (local only)' -AsSecureString
$buyerSecretPointer = [Runtime.InteropServices.Marshal]::SecureStringToBSTR($buyerSecret)
try {
  $env:BUYER_PRIVATE_KEY = [Runtime.InteropServices.Marshal]::PtrToStringBSTR($buyerSecretPointer)
  node buyer-example.mjs --buy
} finally {
  Remove-Item Env:BUYER_PRIVATE_KEY -ErrorAction SilentlyContinue
  [Runtime.InteropServices.Marshal]::ZeroFreeBSTR($buyerSecretPointer)
  $buyerSecret.Dispose()
}

The buyer saves the original attempt and signed proof in .agentpage402-purchase/ before sending. Keep that private folder. Do not delete its marker or run a new purchase to retry an uncertain result.

3. Save your Markdown report

After a confirmed purchase, this command works in either shell. It checks the saved success receipt and writes audit.md in your working folder. The full JSON result and settlement receipt remain in .agentpage402-purchase/receipt.json.

node --input-type=module -e "import { readFile, writeFile } from 'node:fs/promises'; const r = JSON.parse(await readFile(process.argv[1], 'utf8')); if (r.httpStatus !== 200 || r.settlement?.success !== true || typeof r.result?.reportMarkdown !== 'string') throw new Error('No confirmed report; recover the original purchase first.'); await writeFile('audit.md', r.result.reportMarkdown); console.log('Saved audit.md');" .agentpage402-purchase/receipt.json

4. Recover an interrupted purchase

From the same working folder, resend the original proof and input with no key and no new authorization:

node buyer-example.mjs --recover

After successful recovery, run the report-export command above with .agentpage402-purchase/recovery.json in place of .agentpage402-purchase/receipt.json. Optional transaction verification also needs no key:

node buyer-example.mjs --verify

If recovery is still pending or fails, preserve the files and use support before considering another payment. Free hosting can take about a minute to wake.

Choose a different audit

For a 0.01-USDC AEO-only check, set BUYER_SERVICE=aeo and BUYER_MAX_USDC=0.01; its JSON has evidence and actions, not a combined Markdown report. For a fixed 1.00-USDC pack, set BUYER_SERVICE=site-audit, BUYER_MAX_USDC=1.00 and BUYER_URLS to a JSON array of one to five distinct same-origin public URLs. Quote again before buying. A pack charges its fixed price even with fewer than five pages; every requested page must succeed. Start a new private working folder for a separate intended purchase, while retaining prior recovery files.