Chrome, Brave, Edge & Firefox Add-Ons
Monetize Manifest V3 extensions globally without Google Web Store payment deprecations, email login walls, or backend user databases.
Sell Software, Extensions & Plugins Globally — Keep 99.5%.
Stop losing 7%–12% of your indie software revenue to 5% + $0.50 digital marketplaces, card declines, and leaked license keys. With XPayr License Kit, the buyer's wallet is the license: 0.5% flat gateway fee, zero chargebacks, and offline-verifiable ES256 JWT tokens.
1. Creator Take-Home Calculator (MoR vs XPayr)
5% + $0.50 MoR Annual Fees
$8,700
XPayr 0.5% Annual Fees
$570
Extra Annual Profit Kept in Your Wallet
+$8,130 / year
2. Drop-In Offline Verification (@xpayr/extension-kit)
import { verifyLicenseToken } from '@xpayr/extension-kit';
// Verify offline against https://xpayr.com/.well-known/jwks.json
const result = await verifyLicenseToken(jwtFromStorage, {
expectedProduct: 'pro-devtools-extension',
jwksUrl: 'https://xpayr.com/.well-known/jwks.json'
});
if (result.valid) {
enableProFeatures(result.claims.sub, result.claims.plan);
}
Public RFC 7517 JWKS endpoint: https://xpayr.com/.well-known/jwks.json · Privacy spec: Extension Licence Terms
WordPress, WooCommerce & WHMCS Plugins
Sell annual or lifetime pro plugin tiers globally across 180+ markets where developers lack international USD credit cards.
Electron, Rust/Go CLIs & Local AI Agents
Unlock local desktop apps, MCP toolpacks, and developer CLIs with zero-gas wallet signature challenges and air-gapped JWT verification.
License Kit & ES256 Software Licensing FAQ
How does XPayr License Kit stop leaked serial keys and chargeback fraud?
Instead of emailing static serial strings that get pasted onto piracy forums, XPayr binds the product entitlement directly to the buyer wallet address on payment confirmation. To unlock Pro features, the buyer signs a free off-chain challenge message and receives a short-lived ES256 JWT verifiable offline via https://xpayr.com/.well-known/jwks.json.
How much more revenue do digital creators keep vs Gumroad, Lemon Squeezy, or Paddle?
Traditional digital Merchants of Record charge 5% + $0.50 per order (an effective 10% cut on a $10 Chrome extension!) plus payout wire fees and $15 dispute penalties. XPayr charges a flat 0.5% with $0 fixed per-transaction fee — letting you keep 99.5% settled immediately into your own wallet.
Can my Chrome extension, Electron app, or CLI verify licenses offline without hitting XPayr servers on every boot?
Yes. Install @xpayr/extension-kit (v0.2.0 on NPM) or cache XPayr public P-256 JWK keys (/.well-known/jwks.json). Your client verifies the ES256 cryptographic signature locally in under 1 millisecond with zero runtime tracking.
Can AI agents issue or verify software licenses via MCP?
Yes. @xpayr/mcp-server (v1.0.0) includes dedicated license verification and entitlement tools alongside developer docs at /developers/license-kit and our live browser verifier at /tools/wallet-license-verifier.