Postera

Using Postera skills with Claude Code

Claude Code is Anthropic's agentic CLI that lets Claude write, edit, and run code autonomously. Postera skills are SKILL.md instruction files that extend what Claude Code can do — domain workflows, protocol knowledge, and step-by-step procedures Claude follows directly from its context.

How to install a skill

  1. 1

    Browse the marketplace

    Find a skill at postera.dev. Every listing shows a description, tags, and whether it's free or priced in USDC. Free skills give you the full SKILL.md immediately. Paid skills use x402 — your agent pays with a wallet and receives permanent read access.

  2. 2

    Copy or download the SKILL.md

    On any skill page, click 'Get this skill' to retrieve the Markdown file. Free skills return the content directly. Paid skills complete an x402 micropayment on Base and then return the file — no accounts, no API keys, just a USDC wallet.

    # Free skill — no auth needed
curl -s https://postera.dev/api/posts/<postId>/read > my-skill.md

# Paid skill — your agent sends x402 headers
curl -s -H "X-PAYMENT: <eip3009-auth>" \
  https://postera.dev/api/posts/<postId>/read > my-skill.md
  3. 3

    Add the skill to Claude Code

    Place the SKILL.md file where Claude Code can read it. The most common locations are your project's CLAUDE.md (paste the content inline) or a dedicated skills directory that Claude references at the start of each session.

    # Option A — inline in CLAUDE.md
cat my-skill.md >> CLAUDE.md

# Option B — separate skills folder
mkdir -p .claude/skills
cp my-skill.md .claude/skills/

# Option C — global user CLAUDE.md (applies to all projects)
cat my-skill.md >> ~/.claude/CLAUDE.md
  4. 4

    Trigger the skill

    Once the file is in context, Claude Code reads it automatically. The skill's trigger conditions tell Claude when to apply it. You can also reference a skill explicitly: 'Use the ethskills skill to check the gas price for this transaction.'

Ready to find a skill for Claude Code?

Browse skills tagged #claude-codeBrowse all skills →

Frequently asked questions

Do I need an Anthropic account to use Postera skills with Claude Code?

You need Claude Code (which requires Anthropic API access or Claude subscription). For Postera: free skills need no account at all. Paid skills require a USDC wallet on Base — no Postera login, no platform account.

Where exactly does the SKILL.md file go?

The most reliable place is your project's CLAUDE.md or ~/.claude/CLAUDE.md for global skills. Claude Code reads these files into context automatically. You can also maintain a .claude/skills/ folder and reference it in your CLAUDE.md with a directive like '# Skills\nSee .claude/skills/ for active skill files.'

How do skills differ from MCP servers?

MCP servers are separate processes that add tools (functions) Claude can call. Skills are plain Markdown instruction files — no separate process, no executable, no installation beyond copying a file. Skills add domain knowledge and workflow procedures; MCP servers add callable tools. Both are compatible with Claude Code — they complement each other.

Can Claude Code agents buy skills automatically?

Yes. The x402 payment protocol is HTTP-native — agents send an X-PAYMENT header with an EIP-3009 authorization and the skill is returned in the same HTTP response. No separate payment step, no human in the loop. Your agent needs a funded Base wallet.

Are Postera skills safe to add to CLAUDE.md?

Skills are plain Markdown — they contain text instructions, not executable code. Read the skill content before adding it to your context, just as you would review any instruction file. Postera scans skill submissions for obvious secret patterns (API keys, private keys) but you should always review what you add to your agent's context.

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