> ## Documentation Index
> Fetch the complete documentation index at: https://docs.arrays.org/llms.txt
> Use this file to discover all available pages before exploring further.

# What's a Skill

> Arrays Skills are Markdown files that teach your AI agent how to use the Arrays API — no SDK, no glue code.

## How Skills work

A Skill is a single `SKILL.md` file with YAML frontmatter. When you point a markdown-aware agent at it, the agent reads the file as **system context** and learns:

1. What domain this Skill covers (equity fundamentals, crypto futures, etc.)
2. The base URL and auth header
3. Every available endpoint, parameter, and response shape
4. Edge cases and conventions (e.g. fiscal vs calendar quarters)

The agent then composes its own HTTP calls — no plugin runtime, no MCP server, just text.

<Info>
  All 19 Skills are open-source MIT at [github.com/ArraysData/arrays-skills](https://github.com/ArraysData/arrays-skills).
</Info>

## Agent compatibility matrix

| Agent / IDE                     | Status                 | How to install                                 |
| ------------------------------- | ---------------------- | ---------------------------------------------- |
| **Claude Code**                 | ✅ Supported            | [Install guide →](/skills/install-claude-code) |
| **Cursor**                      | ✅ Supported            | [Install guide →](/skills/install-cursor)      |
| **Windsurf**                    | ✅ Supported            | Same as Cursor — add to project rules          |
| **OpenAI Codex**                | ✅ Supported            | [Install guide →](/skills/install-codex)       |
| **ChatGPT (custom GPTs)**       | ⚠️ Workaround          | Paste SKILL.md contents into instructions      |
| **Other markdown-aware agents** | ✅ Generally compatible | Add `SKILL.md` to agent context                |

<Tip>
  Skills work with any agent that supports the open Skill standard. See the full list of compatible agents at [skills.sh/agent](https://www.skills.sh/agent).
</Tip>

## Available Skills

19 skills across equities, crypto, ETFs, macro, and alternative data. Each is a `SKILL.md` you point your agent at.

### Equities

| Skill                                          | What it does                                                              |
| ---------------------------------------------- | ------------------------------------------------------------------------- |
| `arrays-data-api-equity-fundamentals`          | Company profiles, financials, executive comp, KPIs                        |
| `arrays-data-api-equity-estimates-and-targets` | Analyst estimates, price targets, earnings guidance                       |
| `arrays-data-api-equity-events`                | Dividends, splits, earnings calendar, transcripts, SEC filings, IPO, M\&A |
| `arrays-data-api-equity-ownership-and-flow`    | Institutional holdings, insider & congress trades                         |
| `arrays-data-api-stock-metrics`                | Financial + technical metrics (ROE, margins, RSI, MACD, PE…)              |
| `arrays-data-api-stock-screener`               | Screen stocks by country, sector, financials, events                      |
| `arrays-data-api-options`                      | Option contracts, strikes, expiry, options OHLCV                          |

### Crypto

| Skill                                          | What it does                                                                                          |
| ---------------------------------------------- | ----------------------------------------------------------------------------------------------------- |
| `arrays-data-api-spot-market-price-and-volume` | Spot price / volume / OHLCV (Binance, Hyperliquid)                                                    |
| `arrays-data-api-crypto-futures-data`          | Perp OHLCV, funding rates, open interest, long-short ratios                                           |
| `arrays-data-api-crypto-metrics-and-screener`  | On-chain metrics (MVRV, NUPL, SOPR…), fear & greed, token screener                                    |
| `arrays-data-api-crypto-exchange-flow`         | Exchange inflow / outflow / netflow                                                                   |
| `arrays-data-api-crypto-analytics-passthrough` | On-chain analytics passthrough — \~245 upstream endpoints (network data, miner/entity flows, DEX/AMM) |
| `arrays-data-api-company-crypto-holdings`      | Which companies hold which crypto                                                                     |

### ETF & Macro

| Skill                                 | What it does                                         |
| ------------------------------------- | ---------------------------------------------------- |
| `arrays-data-api-etf-fundamentals`    | Holdings, info, country/sector weightings, fund flow |
| `arrays-data-api-macro-and-economics` | Treasury, CPI, GDP, forex, commodities, VIX          |

### Alternative Data

| Skill                                 | What it does                                                      |
| ------------------------------------- | ----------------------------------------------------------------- |
| `arrays-data-api-news`                | Market news articles                                              |
| `arrays-data-api-social-feeds`        | X/Twitter handle feeds, post lookup, account metadata             |
| `arrays-data-api-polymarket`          | Prediction markets — pricing, positions, holders, trade history   |
| `arrays-data-api-semiconductor-price` | DRAM / NAND Flash / memory-card spot & contract prices, DXI index |

<Info>
  Browse the source for any skill in the [arrays-skills repo](https://github.com/ArraysData/arrays-skills/tree/main/skills).
</Info>

## Next step

<Card title="Install your first Skill" icon="rocket" href="/skills/install-claude-code">
  Pick your agent and follow a 30-second guide.
</Card>