Free browser tools
x402 learning tools
Use these browser-only tools to replay the x402 flow, generate a stack-specific starter, and check retention. If you have not performed a v2 loop yet, start withThe Lesson.
how does x402 work
x402 Flow Simulator
Step through a full x402 exchange from the first unpaid request through the 402 challenge, signed retry, verification, settlement, and final 200 response.
Open toolx402 quickstart
x402 Quickstart Configurator
Pick a framework and network to generate a tailored, copy-paste x402 seller quickstart sequence with explanatory notes.
Open toollearn x402
Payment Scheme Quiz
Check your understanding of x402 roles, headers, schemes, networks, facilitator responsibilities, and retry safety.
Open toolFAQ
Tools FAQ
Do the x402 Academy tools send data to a server?
No. The tools use static pages and client-side JavaScript. Inputs stay in the browser and there is no signup, backend, wallet connection, or submitted payment data.
Are these reference tools?
No. These tools are teaching tools. Use x402docs.com and the official x402 docs for field-level reference, SDK signatures, and production details.
Which tool should I start with?
Start with The Lesson at /lesson/ if you have not performed a v2 loop yet. Use the flow simulator to replay the sequence without checkpoints, the quickstart configurator for a stack-specific starter, and the scheme quiz to check retention.
Sources used
- x402 docs: Introduction
Defines x402 as an open payment standard for charging APIs and content directly over HTTP.
- x402 docs: HTTP 402
Explains how x402 uses HTTP 402 to communicate payment requirements.
- x402 docs: Quickstart for Sellers
Official seller setup, package installation, testnet defaults, and payment middleware examples.
- x402 docs: Facilitator
Defines facilitator responsibilities for payment verification and settlement.
- x402docs.com reference tools
Reference-style x402 tools for building 402 responses, pricing, and decoding payment headers.