Free x402 tool

Payment Scheme Quiz

Use this self-test after the quickstart or before a project. It checks whether you can explain the x402 flow well enough to build a small paid endpoint safely.

Self-test

Answer the 8 questions

FAQ

Tool FAQ

Does the quiz store my score?

No. The score is calculated in your browser and disappears when you leave or reset the page.

What score means I am ready to build?

A score of 7 or 8 means the concepts are probably clear enough for a small testnet project. Lower scores should reread the recommended lesson links before touching wallets.

Is this quiz about every x402 scheme?

No. It focuses on the concepts a beginner needs before using exact fixed-price examples. Use official docs for the complete payment-scheme reference.

Sources used

  1. x402 docs: Introduction

    Defines x402 as an open payment standard for charging APIs and content directly over HTTP.

  2. x402 docs: HTTP 402

    Explains how x402 uses HTTP 402 to communicate payment requirements.

  3. x402 docs: Client / Server

    Summarizes client and server responsibilities in x402.

  4. x402 docs: Facilitator

    Defines facilitator responsibilities for payment verification and settlement.

  5. x402 docs: Networks and Token Support

    Documents CAIP-2 network identifiers and supported network namespaces.

  6. x402 docs: Payment-Identifier extension

    Documents idempotency support for retries without duplicate payment processing.