Welcome to the Course
Learn about the x402 protocol for instant, permissionless HTTP-native payments on Avalanche.
Why Take This Course?
The x402 protocol is revolutionizing how payments work on the internet by activating HTTP 402 "Payment Required" status code for instant, permissionless transactions. Built on blockchain technology, x402 enables seamless machine-to-machine payments, making it perfect for AI agents, micropayments, and API monetization.
Traditional payment systems are slow, expensive, and require accounts, KYC, and complex integrations. x402 eliminates these friction points with 2-second settlement times, zero protocol fees, and no account requirements. Payments are gasless for end users—facilitators sponsor the minimal blockchain gas fees (~$0.001 on Avalanche with current network conditions). For developers building on Avalanche, x402 leverages the network's low fees and fast finality to create an ideal environment for high-frequency micropayments.
Course Content
Prerequisites
Before taking this course, you should have:
- Blockchain Fundamentals: Basic understanding of blockchain technology and how transactions work.
- Avalanche Fundamentals: Familiarity with the Avalanche network, particularly the C-Chain.
- HTTP/APIs: Understanding of HTTP protocols, status codes, and API development.
- Programming: Basic knowledge of JavaScript/TypeScript or another programming language.
- Smart Contracts (Optional): Helpful but not required for understanding payment verification.
Learning Outcomes
By the end of this course, you will:
- Understand the x402 protocol and how it activates HTTP 402 for internet-native payments.
- Learn the complete payment flow from request to settlement, including facilitator roles.
- Discover why Avalanche is ideal for x402 implementations with its low fees and fast finality.
- Explore different x402 facilitator implementations available on Avalanche (Thirdweb, PayAI, Ultravioleta DAO, x402-rs).
- Implement x402 middleware in your own applications and configure endpoint pricing.
- Build use cases for AI agent payments, micropayments, and API monetization.
- Master security best practices and scaling considerations for production deployments.
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