Connect non-custodial wallets & generate sk_test_ API keys
Register at /merchant/register, paste your destination EVM, Solana, TRON, or multisig wallet addresses, and generate a free Testnet-API key.
Migration von NOWPayments to XPayr in 12 Minutes
Replace fragile JSON key-sorted HMAC-SHA512 IPN callbacks, custodial payout queues, and stuck exchange underpayments with XPayr raw-body HMAC-SHA256 webhooks, 1% ($0.50 max) tolerance, and 99.5% direkter Wallet-Auszahlung.
🔄 Open Interactive Payload Translator
⚡ Test Live-Checkout-Sandbox
⚖️ XPayr vs. NOWPayments
📊 Commercial Breakdown
Cutover Time~12 Minutes (Parallel Safe)
NOWPayments Fee0.5%–1.0% + conversion/payout network fees
XPayr Gateway-GebührFlat 0.5% ($0/mo · $0 Sweep)
XPayr Verwahrmodell100 % Non-Custodial (99.5% Direct)
Why Engineering & Finance Teams Switch Away From NOWPayments
JSON re-serialization key-sorting in x-nowpayments-sig breaks whenever nested float or null fields are added.
Intermediary deposit addresses require extra sweep gas or manual dashboard payout thresholds.
Partially paid exchange withdrawals often stall in partially_paid without automatic fulfillment rules.
Field-by-Field API & Webhook Mapping (NOWPayments → XPayr v1)
Keep your existing database order schema intact — map these 6 fields to cut over cleanly.
| Integration Layer | NOWPayments (Legacy) | XPayr Non-Custodial v1 |
|---|---|---|
| Create Payment Endpoint | POST https://api.nowpayments.io/v1/invoice (x-api-key) |
POST https://xpayr.com/api/v1/payments (Bearer sk_live_...) |
| Rechnungsbetrag & Fiat | price_amount + price_currency ("usd") |
amount ("99.00") + currency ("USD") |
| Preferred Crypto Asset | pay_currency ("usdttrc20" / "usdcmatic") |
network ("tron" / "polygon") + token ("USDT" / "USDC") |
| Order & Webhook Callback | order_id + ipn_callback_url |
order_id + webhook_url + metadata (JSON object) |
| Webhook Signature Header | x-nowpayments-sig (HMAC-SHA512 sorted object) |
X-XPayr-Signature (HMAC-SHA256 over exact raw HTTP body) |
| Terminal Paid Status | payment_status === "finished" / "partially_paid" |
event === "payment.completed" / "payment.underpaid_accepted" |
Drop-In Migration Adapter (Node.js / Express)
Copy-paste replacement ready for Testnet (sk_test_...) and Mainnet (sk_live_...).
import crypto from 'node:crypto';
/**
* Drop-in webhook verifier replacing NOWPayments x-nowpayments-sig sorted-JSON logic.
* Verifies exact raw HTTP body bytes with timing-safe HMAC-SHA256.
*/
export function handleXpayrWebhook(req, res) {
const rawBody = req.body; // Buffer from express.raw({ type: 'application/json' })
const sigHeader = String(req.headers['x-xpayr-signature'] || '').replace(/^sha256=/i, '');
const expected = crypto
.createHmac('sha256', process.env.XPAYR_WEBHOOK_SECRET)
.update(rawBody)
.digest('hex');
if (expected.length !== sigHeader.length ||
!crypto.timingSafeEqual(Buffer.from(expected, 'utf8'), Buffer.from(sigHeader, 'utf8'))) {
return res.status(401).json({ error: 'Invalid XPayr signature' });
}
const payload = JSON.parse(rawBody.toString('utf8'));
if (payload.event === 'payment.completed' || payload.event === 'payment.underpaid_accepted') {
// Fulfill order using payload.data.order_id and payload.data.tx_hash
}
return res.status(200).json({ received: true });
}
4-Step Zero-Downtime Canary Cutover Checklist
Deploy the X-XPayr-Signature HMAC-SHA256 webhook adapter
Add the raw-body HMAC-SHA256 verification handler alongside your existing NOWPayments callback endpoint and test events in /tools/webhook-tester.
Canary 10%–25% of live checkout sessions in parallel
Route a slice of live crypto orders to POST /api/v1/payments (or enable the XPayr storefront plugin) to verify instant 99.5% direkter Wallet-Auszahlung.
Cut over 100% of traffic & export clean ERP ledgers
Switch primary crypto checkout routing to XPayr, withdraw any remaining custodial float from NOWPayments, and export QuickBooks/Xero CSVs via /accounting.
Häufig gestellte Fragen — Switching From NOWPayments
Can we keep NOWPayments active while testing XPayr on production?
Yes. Add XPayr alongside NOWPayments as a parallel payment option or route 20% of crypto sessions to XPayr first; there are $0 monthly fees and zero exclusivity contracts.
How does XPayr handle NOWPayments partially_paid exchange orders?
XPayr Dualer Checkout includes configurable 1% (max. $0.50 USD) underpayment tolerance, automatically completing minor CEX fee-deducted transfers via payment.underpaid_accepted.
Do our WooCommerce or WHMCS stores need custom code to switch?
No. Install the official open-source XPayr WooCommerce or WHMCS gateway plugin from /plugins, test with sk_test_ keys, and toggle it active in 2 minutes.