Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add OpenCMC/skills-for-ai-agents-by-CoinMarketCap --skill cmc-api-marketgit clone --depth 1 https://github.com/OpenCMC/skills-for-ai-agents-by-CoinMarketCapWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/opencmc/skills-for-ai-agents-by-coinmarketcap/cmc-api-market)<a href="https://agentmods.dev/skills/opencmc/skills-for-ai-agents-by-coinmarketcap/cmc-api-market"><img src="https://agentmods.dev/badge/skills/opencmc/skills-for-ai-agents-by-coinmarketcap/cmc-api-market/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/opencmc/skills-for-ai-agents-by-coinmarketcap/cmc-api-market"><img src="https://agentmods.dev/badge/skills/opencmc/skills-for-ai-agents-by-coinmarketcap/cmc-api-market.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00109 | $0.01646 |
| Opus 5.5 | $0.00044 | $0.00658 |
| Sonnet 5.5 | $0.00022 | $0.00329 |
| Haiku 4.5 | $0.00011 | $0.00165 |
Grade A, and why
cmc-api-market scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -X GET "https://pro-api.coinmarketcap.com/v1/global-metrics/quotes/latest" \ How it starts
The opening of the file, as written. The whole thing — 193 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CoinMarketCap Market API Skill
This skill covers market-wide cryptocurrency data including global metrics, sentiment indicators, market indices, community activity, news content, charting data, and utility endpoints.
Authentication
All requests require the X-CMC_PRO_API_KEY header.
curl -X GET "https://pro-api.coinmarketcap.com/v1/global-metrics/quotes/latest" \
-H "X-CMC_PRO_API_KEY: your-api-key"
Get your API key at: https://pro.coinmarketcap.com/login
Base URL
https://pro-api.coinmarketcap.com
Common Use Cases
See use-cases.md for goal-based guidance on which endpoint to use:
- Get current market sentiment (Fear & Greed)
- Get total crypto market cap
- Get BTC dominance
- Track market cap history
- Track Fear & Greed history
- Get CMC100 index performance
- Compare CMC100 vs CMC20
- Get OHLCV candlestick data for charts
- Get simple price time series
- Get community trending tokens
- Get trending discussion topics
- Get latest crypto news
- Convert currency amounts
- Check API usage and limits
- Get fiat currency IDs
API Overview
Global Metrics
| Endpoint | Description | Reference |
|---|---|---|
| GET /v1/global-metrics/quotes/historical | Historical global market metrics | global-metrics.md |
| GET /v1/global-metrics/quotes/latest | Latest total market cap, BTC dominance | global-metrics.md |
Fear and Greed Index
| Endpoint | Description | Reference |
|---|---|---|
| GET /v3/fear-and-greed/historical | Historical fear/greed values | fear-greed.md |
| GET /v3/fear-and-greed/latest | Current market sentiment score | fear-greed.md |
Market Indices
| Endpoint | Description | Reference |
|---|---|---|
| GET /v3/index/cmc100-historical | CMC100 index history | indices.md |
| GET /v3/index/cmc100-latest | CMC100 current value | indices.md |
| GET /v3/index/cmc20-historical | CMC20 index history | indices.md |
| GET /v3/index/cmc20-latest | CMC20 current value | indices.md |
What ships with it
8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 193 lines · 109 tokens per session scan A 20fa79246c9f
cmc-api-market is a skill published in the GitHub repository OpenCMC/skills-for-ai-agents-by-CoinMarketCap (75 stars, last pushed 4d ago), licensed MIT. It adds 109 tokens to every session and 1,646 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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