Pricing
The x402 Seller Kit costs $29, paid once as 29 USDC on Base. There is no subscription and no account.
| What you pay | Details |
|---|---|
| From a wallet | Send 29 USDC (or more) on Base in one transfer, then sign a free message. Anything above 29 is not needed. |
| From an exchange | 29 USDC plus a small extra amount unique to your order, under $1 and usually a few cents (for example 29.37), sent within 2 hours of creating the order. The extra identifies your payment and is part of what you pay. |
| Network fee | Paid by you to the Base network, usually a few cents in ETH, unless your wallet covers it. It does not go to us. |
| Running your store | Cloudflare’s Workers free plan and D1 are enough to start. Your buyers pay their own network fees. |
What’s included
A ZIP with 17 files, version 1.0.6:
x402-seller-kit-v1/
├── README.md quickstart, how a sale works, honest limits
├── docs/
│ ├── HOW-IT-WORKS.md threat model: replay, front-running, fake token…
│ ├── PLAYBOOK.md free x402/agent directories tested Oct 2026
│ └── BUYER-COPY.md "how to pay with USDC on Base" page text
├── template/
│ ├── worker.js storefront, /claim, /order, x402 402, llms.txt
│ ├── orders.js claim engine: wallet signatures + order codes
│ ├── wallet-proof.js ecrecover + ERC-1271 smart-wallet check
│ ├── secp256k1.js vendored @noble/secp256k1 (MIT)
│ ├── config.js the only file you must edit
│ ├── schema.sql D1: orders, claims, rate
│ ├── migrate-v1.0.3.sql upgrade from earlier versions
│ ├── wrangler.toml.example
│ ├── product.b64.js placeholder for your file
│ └── scripts/
│ ├── embed-file.py embed your file
│ └── smoke-test.sh 12 checks against your live store
├── LICENSE.md
└── CHANGELOG.md
Licence: use and modify it for as many of your own stores as you like, personal or commercial. You may not resell or redistribute the kit itself.
You can download it up to 5 times per payment. There is no update subscription: you get the current version.
Not included
- Hosting, a Cloudflare account or a facilitator. You deploy the Worker to your own account.
- Setup or consulting. Support is by email for problems with your purchase.
- Any promise of sales.
Free
- Full README and file list
- x402 endpoint checker (web, JSON API and MCP)
- Guides
Free starters exist too: see the comparison on the home page. Refunds cover non-delivery: see Support & refunds.