How do I install the Cmc X402 Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/cmc-x402/SKILL.md and restart Claude Code. Both flows are detailed at https://claudskills.com/install/.

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

ClaudSkills / General / general-misc

Cmc X402

Category: General · Sub-category: general-misc · Last updated: 2026-05-21

Access CoinMarketCap data via x402 pay-per-request protocol with USDC payments on Base. Use when users mention x402, want CMC data without API keys, ask about pay-per-request APIs, or need to integrate CMC with on-chain payments. Also use for any Coinbase x402 protocol questions. Trigger: "x402", "pay per request", "no API key", "USDC payment", "CMC without subscription", "/cmc-x402"

From the source SKILL.md

Pay-per-request crypto market data powered by the x402 protocol. Access CoinMarketCap endpoints instantly with on-chain USDC payment. No API key or subscription required.

What this skill does

Cmc X402 is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/cmc-x402/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when users mention x402, want CMC data without API keys, ask about pay-per-request APIs, or need to integrate CMC with on-chain payments. Also use for any Coinbase x402 protocol questions.

Who uses this skill

The Cmc X402 Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 70,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

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

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

Skills live at ~/.claude/skills/cmc-x402/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\cmc-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.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Attribution & license

Source: https://github.com/coinbase/x402
Author: coinbase

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

coinbase. (2026). Cmc X402 [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/cmc-x402/

BibTeX

@misc{cmc-x402-2026,
  author    = {coinbase},
  title     = {Cmc X402 [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/cmc-x402/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/cmc-x402.svg)](https://claudskills.com/skills/cmc-x402/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

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