Ulasend Docs

Accept crypto (and card → crypto) payments with a Stripe-style invoice API and hosted checkout.

Ulasend lets your app create a payment, send the buyer to a hosted checkout page, and get notified when the money lands — by wallet transfer or by buying crypto with a card.

What you integrate

Create an invoice from your server with your API key.
Redirect the buyer to the checkout_url we return.
Handle webhooks (invoice.paid) so you can fulfill the order.

Your end customer never sees your API key. They only see the hosted payment page.

Guides

Dynamic checkout (API) — create a new invoice per order with that cart's usd_amount.
Identify the buyer — pass customer_email and/or external_reference, or stay anonymous with a warning.
Let buyers pick the coin — opt in with allow_asset_selection on USD-priced invoices.
Buy with card — Stripe fiat → crypto; defaults to USDC unless the buyer picks another coin.
Supported assets — platform coins and per-merchant Accepted coins settings.
Webhooks — signed events when payment completes.

Security

These docs only show placeholder credentials (pk_test_…, $ULASEND_API_KEY). Never paste live secret keys into frontend code, chat, or public repos. Keys live in your server environment and the Ulasend dashboard.

Start with the quickstart →