Buildathons.ai

Accept Crypto Payments in Your App Course

Integrate crypto payments end-to-end — QR code generation, transaction monitoring, webhook confirmations, and multi-currency support for BTC, ETH, SOL, and…

Course overview

Integrate crypto payments end-to-end — QR code generation, transaction monitoring, webhook confirmations, and multi-currency support for BTC, ETH, SOL, and USDC.

Crypto Payment Flow Architecture

Accepting crypto payments in a web app requires: 1. Payment Intent: User selects amount + currency → backend calculates crypto amount at current rate → stores intent with 30-min expiry 2. Payment Address: Generate (or reuse) a deposit address for the currency 3. QR Code: Display BIP21 URI as a QR code — wallet apps scan and pre-fill amount 4. Monitoring: Poll or webhook from your node/gateway to detect incoming transactions 5. Confirmation: Wait for N confirmations (1-6 for ETH/SOL, 1-3 for BTC) before granting access 6. Expiry Handling: Cancel unconfirmed intents after timeout

BIP21 Payment URIs & QR Codes

BIP21 is the standard URI format for Bitcoin payment requests. Ethereum uses a similar EIP-681 format.

Transaction Monitoring & Webhooks

Monitor incoming transactions using blockchain APIs rather than running your own node.