ClaudSkills / Engineering / engineering-misc

X402

Quality score: 70/100 · Category: Engineering · Sub-category: engineering-misc

lang:pythonlang:typescript

Build internet-native payments with the x402 open protocol (x402 Foundation, Apache-2.0). Use when developing paid APIs, paywalled content, AI agent payment flows, or any service using HTTP 402 Payment Required for on-chain micropayments. Covers TypeScript (2.9.0), Python (2.6.0), and Go (2.7.0) SDKs across EVM (Base, MegaETH, Monad, Polygon, Stable, Arbitrum), Solana, Stellar, and Aptos networks with HTTP, MCP, and A2A transports. Supports exact and upto (usage-based) payment schemes, self-facilitation, and extensions (bazaar, gas sponsoring, sign-in-with-x).

What this skill does

X402 is a production-ready Claude Code skill (quality score 70/100) in the engineering-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/x402/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when developing paid APIs, paywalled content, AI agent payment flows, or any service using HTTP 402 Payment Required for on-chain micropayments. Covers TypeScript (2.

Who uses this skill

The X402 skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It is part of the open ClaudSkills registry, a community-curated catalog of 15,000+ capabilities you can install for Claude Code — the Claude CLI agent.

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/x402
curl -L https://claudskills.com/skills/x402/SKILL.md \
  -o ~/.claude/skills/x402/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/x402/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/x402/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\x402\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

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Part of ClaudSkills — the open registry for Claude Code skills. · What's New · Install guide · About · llms.txt

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