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Prerequisites

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1. Clone the Skills repo

git clone https://github.com/ArraysData/arrays-skills.git

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2. Point Claude Code at the Skills

In your project, create or edit .claude/CLAUDE.md and reference the Skills directory: 
# Project context

Use these Arrays Skills when answering financial-data questions:

@/absolute/path/to/arrays-skills/skills/
Or symlink the skills/ folder into your project root so the path is relative and portable across machines.

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3. Set your API key

Add to your shell config (~/.zshrc or ~/.bashrc): 
export ARRAYS_API_KEY="your_key_here"
export ARRAYS_API_BASE_URL="https://data-tools.prd.arrays.org/api"
Reload: source ~/.zshrc

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4. Try it

In Claude Code, ask: 
What was AAPL's revenue and net income last quarter?
Claude should automatically pick the arrays-data-api-equity-fundamentals Skill, call the company/income-statements endpoint, and return real numbers.

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Troubleshooting

Verify CLAUDE.md is in the project root or .claude/ folder, and that the path inside it is absolute or correctly resolved. Try running claude --debug to see which context files are loaded.
Check echo $ARRAYS_API_KEY is set in the same shell session where Claude Code runs. If you opened Claude Code from a GUI, export the var system-wide or use a .env file at the project root.
Free tier is capped at 100 req/day. See Pricing for Pro and Enterprise quotas, or use Nanopayment for crypto endpoints with no quota.