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ClaudSkills / Security / security-misc

X402 Payments

Category: Security  ·  Sub-category: security-misc  ·  Last updated:
type:audit
Use whenever the user wants to add payments to an API, monetize endpoints, implement x402, handle HTTP 402 responses, create paid APIs, set up crypto paywalls, accept USDC, or build agent payments. Trigger on: x402, 402 Payment Required, paid API, paywall, micropayments, USDC payments, agent payments, monetize API, payment middleware, x402-next, x402-express, x402-fetch, Sentinel, payment router, audit trail, budget caps, payment receipts, facilitator. Also trigger when turning a free API into paid, adding per-request pricing, or building AI agent autonomous payment flows. Covers Base (EVM) and Solana with USDC. Covers Chainlink CRE (Chainlink Runtime Environment) workflows triggered by x402 payments. Trigger also on: Chainlink CRE, CRE workflow, onchain automation with payments, price alerts with x402, Chainlink price feeds with payments, x402 CRE integration, paid CRE workflows, monetize Chainlink workflows. Even without "x402" mentioned — if they want to charge for API access with crypto or build agent payment infrastructure, this skill applies.

From the source SKILL.md

Build paid APIs and agent payment infrastructure using the x402 protocol. Deploy on Base (EVM) and/or Solana with USDC. Optionally add Sentinel Payment Router for multi-endpoint orchestration, budget caps, and cryptographic audit trails.

What this skill does

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

When to invoke it: Use whenever the user wants to add payments to an API, monetize endpoints, implement x402, handle HTTP 402 responses, create paid APIs, set up crypto paywalls, accept USDC, or build agent payments. Trigger on: x402, 402 Payment Required, paid API, paywall, micropayments, USDC payments, agent payments, monetize API, payment middleware, x402-next, x402-express, x402-fetch, Sentinel, payment router, audit trail, budget caps, payment receipts, facilitator.

Who uses this skill

The X402 Payments Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 116,000+ 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/x402-payments
curl -L https://claudskills.com/skills/x402-payments/SKILL.md \
  -o ~/.claude/skills/x402-payments/SKILL.md

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

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

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

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

Frequently asked questions

How do I install the X402 Payments Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/x402-payments/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the X402 Payments skill do?
Use whenever the user wants to add payments to an API, monetize endpoints, implement x402, handle HTTP 402 responses, create paid APIs, set up crypto paywalls, accept USDC, or build agent payments. Trigger on: x402, 402 Payment Required, paid API, paywall, micropayments, USDC payments, agent payments, monetize API, payment middleware, x402-next, x402-express, x402-fetch, Sentinel, payment router, audit trail, budget caps, payment receipts, facilitator. Also trigger when turning a free API into paid, adding per-request pricing, or building AI agent autonomous payment flows. Covers Base (EVM) and Solana with USDC. Covers Chainlink CRE (Chainlink Runtime Environment) workflows triggered by x402 payments. Trigger also on: Chainlink CRE, CRE workflow, onchain automation with payments, price alerts with x402, Chainlink price feeds with payments, x402 CRE integration, paid CRE workflows, monetize Chainlink workflows. Even without "x402" mentioned — if they want to charge for API access with crypto or build agent payment infrastructure, this skill applies.
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.
When should I use the X402 Payments skill?
Use X402 Payments when your Claude Code task falls under the Security category — specifically in the security misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use X402 Payments" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the X402 Payments skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. X402 Payments is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

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

APA
mistertechie06. (2026). X402 Payments [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/x402-payments/
BibTeX
@misc{x402-payments-2026,
  author    = {mistertechie06},
  title     = {X402 Payments [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/x402-payments/}
}

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