Devryno Merchant Feed Audit - Base USDC payment checklist

Use this when you want the normal wallet checkout instead of x402.

Before paying:
- Make sure the feed URL is public and parseable.
- Free preview form: https://devryno.com/free/merchant-feed-preview
- Sample preview: https://devryno.com/free/merchant-feed-preview?url=https%3A%2F%2Fdevryno.com%2Fexamples%2Fgoogle-merchant-feed.xml&limit=2
- The free preview only parses rows; it does not compare product pages.

Payment:
- Network: Base
- Token: USDC
- Amount: 0.25 USDC
- Recipient: 0xdD1729943bf7C408456cef52886ad12B05B57dC2
- Checkout page: https://devryno.com/buy/merchant-feed-audit
- Quote API: https://devryno.com/quote/merchant-feed-audit?url={public-product-feed-url}&limit={1-10}

After paying:
- Copy the Base transaction hash for the payment you just sent.
- Paste it into the claim form with the same feed URL and limit.
- Claim URL template: https://devryno.com/claim/merchant-feed-audit?url={public-product-feed-url}&limit={1-10}&tx={base-transaction-hash}
- A successful claim verifies a USDC Transfer to Devryno before returning the audit JSON.

Common mistakes:
- Wrong chain: Ethereum mainnet, Polygon, Arbitrum, or Optimism payments will not unlock this Base checkout.
- Wrong asset: send USDC on Base, not ETH or another token.
- Wrong tx hash: paste the payment transaction hash to Devryno, not the feed URL, quote URL, or product-page tx.
- Private feed: Devryno can only fetch public HTTP/HTTPS feed URLs.
- Reuse: one service payment transaction hash is intended for one matching request.

If you are an agent:
1. Call the free preview or quote endpoint first.
2. Ask the wallet/user to send the exact Base USDC amount.
3. Wait for the transaction hash.
4. Call the claim URL and parse the JSON report.