Sell files for USDT without a payment gateway, an account system or a single API key. One shortcode renders a price box with your receiving address and a hash field; when the buyer pastes their transaction hash, the plugin reads the receipt from the Ethereum network itself and, once the payment covers the price, serves a signed download link. It runs day and night with nobody watching.

WHAT YOU GET

One plugin folder, no build tools:

• usdt-deliver.php - bootstrap: settings page, shortcode, REST endpoint, signed download links, replay guard, verification log

• /includes/class-usdt-verifier.php - the framework-free on-chain verifier (the actual proof engine)

• /assets/usdt-deliver.css - white, gentle shortcode styles, one commented file to re-skin

• /assets/usdt-deliver.js - copy button and verify flow (vanilla JS, no dependencies)

• /tests/run-tests.php - 21-check CLI test suite, unit plus a live network proof

• readme.txt, README.md and INSTALL.md - WordPress readme, feature guide, step-by-step setup with a full troubleshooting table

GPL-2.0-or-later on the code. No bundled libraries, no trackers.

BUILT THE WAY A CHECKOUT SHOULD BEHAVE

1. Verified, not trusted - The receipt is read from the network: transfer event, token contract, recipient address and summed amounts are all checked before anything unlocks.

2. Replay protected - One transaction unlocks exactly one product. Reusing a hash elsewhere is refused, while the same buyer can re-download their own purchase forever.

3. Tamper-proof pricing - Price, product and file are signed server-side with your WordPress salts and re-checked on every request, so editing the form in DevTools changes nothing.

4. Locked down - Private links expire, file paths are confined to wp-content/uploads, ../ escapes are rejected, and the verify endpoint is rate limited to 20 attempts per minute per IP.

LIVE IN UNDER FIVE MINUTES

1. Upload the plugin - Plugins > Add New > Upload, choose the zip, activate. Or copy the usdt-deliver folder into wp-content/plugins/.

2. Set your wallet - Settings > USDT Deliver, paste the USDT receiving address. The token contract and six public RPC endpoints already have sensible defaults.

3. Upload your file - Drop the product into the Media Library and note its ID from the URL (post=123 means 123).

4. Paste the shortcode - [usdt_deliver price="19" product="My Digital File" file="123"] anywhere in WordPress. Test with a small self-transfer from your own wallet first - it only costs the network gas.

WHY BUYERS PICK THIS

• No API keys, ever: it reads public endpoints directly - no explorer accounts, no usage bill, no service that can shut down.

• Clear messages for every miss: pending, reverted, wrong network and underpayment each get their own friendly wording instead of a silent failure.

• Works with everything: any theme, any page builder, WooCommerce alongside - one shortcode per product page.

• Ships with proof: php tests/run-tests.php runs 21 checks including a live transfer pulled straight from the network.

• Instant download: Checkout, delivery and re-downloads are handled for you - pay once and the zip is in your library straight away.

FAQ

Do I need WooCommerce or a page builder?
No. Any theme, any page: one shortcode per product. WooCommerce can keep handling your physical goods while this takes the digital ones.

Do I need API keys or an account anywhere?
No. The plugin reads public JSON-RPC endpoints directly - six ship as defaults and you can add your own. Nothing to sign up for, nothing to expire.

Can the buyer fake the price or the file?
No. Price, product and file are signed server-side with your WordPress salts; the verification endpoint re-checks the signature before it ever contacts the network.

Can one payment unlock two products?
No. A hash is recorded against the product it paid for, and reusing it elsewhere is refused. The same buyer can re-download their own purchase as often as they like.

Which payment network does it work with?
The plugin verifies USDT on the Ethereum network (ERC-20). Other networks can be added by changing the token contract address in Settings.

How do I get the files?
Checkout is instant. The download appears as soon as the payment clears, stays in your library forever, and can be re-downloaded as often as you need.

What if something goes wrong?
Every purchase is covered by the marketplace money-back guarantee, reviewed by the platform itself - you are never left arguing with a seller.

LIVE PREVIEW (specs, install steps, FAQ)

https://fyosamu.github.io/fashion-store/plugin.html

The preview page shows the exact box your customers get, the shortcode reference, the four install steps and the full FAQ. The plugin itself ships with its own 21-check test suite you can run on any PHP 7.4+ machine: php tests/run-tests.php.