Crypto Payments for SaaS: How to Bill Subscriptions in USDT

The Subscription Challenge in Crypto

Traditional subscriptions work because you store a card token and charge it monthly. Crypto wallets don't work like that — the customer must initiate every payment. Your job is to make the renewal process as frictionless as possible.

Architecture Pattern: Renewal Reminders + Payment Link

The most reliable pattern for USDT subscriptions is:

1. 7 days before renewal: email the customer with a payment link
2. 3 days before: reminder email
3. Renewal day: final reminder, downgrade to free plan if unpaid
4. Grace period: 3–7 days window where account is restricted but not deleted

Implementation

// Cron job: runs daily
async function processRenewals() {
  const due = await db.query(
    `SELECT * FROM subscriptions
     WHERE next_billing_date <= NOW() + INTERVAL '7 days'
     AND status = 'active'`
  );

  for (const sub of due.rows) {
    const link = await paychainly.createPaymentLink({
      name: `Renewal – ${sub.plan} plan`,
      amount: sub.price_usdt,
      redirectUrl: `https://app.yoursite.com/billing/confirm`,
    });
    await sendRenewalEmail(sub.user_email, link.url, sub.next_billing_date);
  }
}

Handling Overpayment and Underpayment

Always accept a range around the expected amount (±2%). Record the exact amount received and credit the user's account accordingly. Never reject a payment just because it's off by a few cents of rounding.

Annual Plans

Annual USDT subscriptions are simpler since the customer pays once per year. The renewal cycle is long enough that email reminders work reliably. Offer a 10–20% discount over monthly to incentivize annual commitment.