cmc-api-crypto

CoinMarketCap Cryptocurrency API

This skill covers the CoinMarketCap Cryptocurrency API endpoints for retrieving price data, market listings, historical quotes, trending coins, and token metadata.

Authentication

All requests require an API key in the header.

curl -X GET "https://pro-api.coinmarketcap.com/v1/cryptocurrency/listings/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:

1. Get current price of a token
2. Find a token's CMC ID from symbol or name
3. Get a token by contract address
4. Get top 100 coins by market cap
5. Find coins in a price range
6. Get historical price at a specific date
7. Build a price chart (OHLCV data)
8. Find where a coin trades
9. Get all-time high and distance from ATH
10. Find today's biggest gainers
11. Discover newly listed coins
12. Get all tokens in a category (e.g., DeFi)

API Overview

Endpoint	Description	Reference
GET /v1/cryptocurrency/categories	List all categories with market metrics	categories.md
GET /v1/cryptocurrency/category	Single category details	categories.md
GET /v1/cryptocurrency/listings/historical	Historical listings snapshot	listings.md
GET /v1/cryptocurrency/listings/latest	Current listings with market data	listings.md
GET /v1/cryptocurrency/listings/new	Newly added cryptocurrencies	listings.md
GET /v1/cryptocurrency/map	Map names/symbols to CMC IDs	map.md
GET /v1/cryptocurrency/trending/gainers-losers	Top gainers and losers	trending.md
GET /v1/cryptocurrency/trending/latest	Currently trending coins	trending.md
GET /v1/cryptocurrency/trending/most-visited	Most visited on CMC	trending.md
GET /v2/cryptocurrency/info	Static metadata (logo, description, URLs)	info.md
GET /v2/cryptocurrency/market-pairs/latest	Trading pairs for a coin	market-pairs.md
GET /v2/cryptocurrency/ohlcv/historical	Historical OHLCV candles	ohlcv.md
GET /v2/cryptocurrency/ohlcv/latest	Latest OHLCV data	ohlcv.md
GET /v2/cryptocurrency/price-performance-stats/latest	Price performance stats	price-performance.md
GET /v2/cryptocurrency/quotes/latest	Latest price quotes	quotes.md
GET /v3/cryptocurrency/quotes/historical	Historical price quotes	quotes.md

Common Workflows

Get Token Price by Symbol

1. First, map the symbol to a CMC ID using /v1/cryptocurrency/map
2. Then fetch the price using /v2/cryptocurrency/quotes/latest

# Step 1: Get CMC ID for ETH
curl -X GET "https://pro-api.coinmarketcap.com/v1/cryptocurrency/map?symbol=ETH" \
  -H "X-CMC_PRO_API_KEY: your-api-key"

# Step 2: Get price quote (using id=1027 for ETH)
curl -X GET "https://pro-api.coinmarketcap.com/v2/cryptocurrency/quotes/latest?id=1027" \
  -H "X-CMC_PRO_API_KEY: your-api-key"

Get Top 100 Coins by Market Cap

curl -X GET "https://pro-api.coinmarketcap.com/v1/cryptocurrency/listings/latest?limit=100&sort=market_cap" \
  -H "X-CMC_PRO_API_KEY: your-api-key"

Get Historical Price Data

curl -X GET "https://pro-api.coinmarketcap.com/v3/cryptocurrency/quotes/historical?id=1&time_start=2024-01-01&time_end=2024-01-31&interval=daily" \
  -H "X-CMC_PRO_API_KEY: your-api-key"

Get Token Metadata

curl -X GET "https://pro-api.coinmarketcap.com/v2/cryptocurrency/info?id=1,1027" \
  -H "X-CMC_PRO_API_KEY: your-api-key"

Error Handling

HTTP Status Codes

Code	Meaning
200	Success
400	Bad request (invalid parameters)
401	Unauthorized (invalid API key)
403	Forbidden (endpoint not available on your plan)
429	Rate limit exceeded
500	Server error

Rate Limits

Rate limits depend on your subscription plan. The response headers include:

1. X-CMC_PRO_API_KEY_CREDITS_USED - Credits used this call
2. X-CMC_PRO_API_KEY_CREDITS_LEFT - Credits remaining

Common Errors

Invalid ID: Ensure you use valid CMC IDs from the /map endpoint. Symbol lookups may return multiple matches.

Missing Required Parameter: Some endpoints require at least one identifier (id, slug, or symbol).

Plan Restrictions: Historical endpoints and some features require paid plans. Check your plan limits.

Error Response Format

{
  "status": {
    "timestamp": "2024-01-15T12:00:00.000Z",
    "error_code": 400,
    "error_message": "Invalid value for 'id'",
    "credit_count": 0
  }
}

Response Format

All responses follow this structure:

{
  "status": {
    "timestamp": "2024-01-15T12:00:00.000Z",
    "error_code": 0,
    "error_message": null,
    "credit_count": 1
  },
  "data": { ... }
}

Reference Files

See the references/ directory for complete parameter and response documentation for each endpoint.