Start building

A clear path from your first request to a verified payment.

Your first integration

1. Open the merchant dashboard and find your Merchant ID and API key in merchant settings.
2. Keep your API key on your server. Follow the authentication guide and validate request signing against the signature test vectors.
3. Create an invoice from your backend using the invoice guide. Persist its identifier and send the customer to the returned payment URL.
4. Configure and verify webhooks. Confirm payment from verified events and persisted status; a browser redirect alone is not proof of payment.
5. Handle duplicate notifications and ambiguous request outcomes. Check the current API contract before retrying a write.

Explore the live coin catalog

This public read-only request lets you inspect the current catalog before making signed requests.

curl 'https://api.coinssend.com/v1/coins-and-fee' \
  --header 'Accept: application/json'

Continue with the full quickstart

Build with your agent

Connect your coding assistant to the docs or start with a task prompt.

Agent setup and prompts

The interface and introductory guides are available in six languages. Detailed API guides currently use the English reference.