Free browser tools

x402 learning tools

Use these browser-only tools to learn the x402 flow, generate a stack-specific starter, and check whether the protocol concepts are ready enough for a small build.

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.

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x402 quickstart

x402 Quickstart Configurator

Pick a framework and network to generate a tailored, copy-paste x402 seller quickstart sequence with explanatory notes.

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learn x402

Payment Scheme Quiz

Check your understanding of x402 roles, headers, schemes, networks, facilitator responsibilities, and retry safety.

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FAQ

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 flow simulator if the protocol is new, then use the quickstart configurator for a stack-specific starter, and finish with the scheme quiz.

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: Quickstart for Sellers

    Official seller setup, package installation, testnet defaults, and payment middleware examples.

  4. x402 docs: Facilitator

    Defines facilitator responsibilities for payment verification and settlement.

  5. x402docs.com reference tools

    Reference-style x402 tools for building 402 responses, pricing, and decoding payment headers.