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CoinGecko API Skill
Query the CoinGecko API for comprehensive crypto market data — prices, historical charts, exchange volumes, trending tokens, global stats, and category breakdowns. The free tier requires no API key and supports 30 calls/min.
When to Use This Skill
- Macro analysis: Global market cap, BTC dominance, total volume trends
- Historical data: Daily/hourly OHLCV going back years (not minutes-level)
- Cross-exchange comparisons: Exchange volume rankings and trust scores
- Trending/discovery: What tokens are trending on CoinGecko in the last 24h
- Category analysis: Compare DeFi vs L1 vs meme coin market caps
- Token research: Full metadata including links, description, community stats
Use Birdeye or DexScreener instead for real-time Solana DEX data, new token launches, or sub-daily granularity on Solana tokens.
Quick Start
Get Current Prices
python
import httpx
# No API key needed for free tier
resp = httpx.get(
"https://api.coingecko.com/api/v3/simple/price",
params={"ids": "solana,bitcoin,ethereum", "vs_currencies": "usd",
"include_24hr_change": "true"},
)
data = resp.json()
for coin, info in data.items():
print(f"{coin}: ${info['usd']:.2f} ({info['usd_24h_change']:+.1f}%)")Get Top Coins by Market Cap
python
import httpx
resp = httpx.get(
"https://api.coingecko.com/api/v3/coins/markets",
params={"vs_currency": "usd", "order": "market_cap_desc",
"per_page": 10, "page": 1, "sparkline": "false"},
)
for coin in resp.json():
print(f"{coin['symbol'].upper():>6} ${coin['current_price']:>10,.2f} "
f"MCap: ${coin['market_cap']/1e9:.1f}B "
f"24h: {coin['price_change_percentage_24h']:+.1f}%")Get Historical Price Data
python
import httpx
import pandas as pd
resp = httpx.get(
"https://api.coingecko.com/api/v3/coins/solana/market_chart",
params={"vs_currency": "usd", "days": "90", "interval": "daily"},
)
data = resp.json()
df = pd.DataFrame(data["prices"], columns=["timestamp", "price"])
df["date"] = pd.to_datetime(df["timestamp"], unit="ms")
df = df.set_index("date").drop(columns=["timestamp"])
print(df.describe())Get OHLC Candle Data
python
import httpx
resp = httpx.get(
"https://api.coingecko.com/api/v3/coins/solana/ohlc",
params={"vs_currency": "usd", "days": "30"},
)
# Returns [[timestamp, open, high, low, close], ...]
candles = resp.json()
for c in candles[-5:]:
print(f" O={c[1]:.2f} H={c[2]:.2f} L={c[3]:.2f} C={c[4]:.2f}")Global Market Stats
python
import httpx
resp = httpx.get("https://api.coingecko.com/api/v3/global")
g = resp.json()["data"]
print(f"Total Market Cap: ${g['total_market_cap']['usd']/1e12:.2f}T")
print(f"24h Volume: ${g['total_volume']['usd']/1e9:.0f}B")
print(f"BTC Dominance: {g['market_cap_percentage']['btc']:.1f}%")
print(f"Active Coins: {g['active_cryptocurrencies']:,}")Trending Coins
python
import httpx
resp = httpx.get("https://api.coingecko.com/api/v3/search/trending")
for item in resp.json()["coins"]:
coin = item["item"]
print(f"#{coin['market_cap_rank'] or '?':>4} {coin['name']} ({coin['symbol']})")Authentication
The free tier requires no API key (30 calls/min). For higher limits, get a Pro key from https://www.coingecko.com/en/api/pricing and set:
bash
export COINGECKO_API_KEY="CG-xxxxxxxxxxxxxxxxxxxx"Pro requests use a different base URL and header:
python
import os, httpx
API_KEY = os.getenv("COINGECKO_API_KEY", "")
if API_KEY:
BASE_URL = "https://pro-api.coingecko.com/api/v3"
HEADERS = {"x-cg-pro-api-key": API_KEY}
else:
BASE_URL = "https://api.coingecko.com/api/v3"
HEADERS = {}Rate Limiting
Free tier: 30 requests/min. Implement backoff on 429 responses:
python
import time, httpx
def cg_get(url: str, params: dict, max_retries: int = 3) -> dict:
"""GET with retry on rate limit."""
for attempt in range(max_retries):
resp = httpx.get(url, params=params, headers=HEADERS, timeout=15.0)
if resp.status_code == 429:
wait = 2 ** attempt * 10
print(f"Rate limited, waiting {wait}s...")
time.sleep(wait)
continue
resp.raise_for_status()
return resp.json()
raise RuntimeError("Max retries exceeded")Finding CoinGecko Token IDs
CoinGecko uses slug-style IDs (e.g., solana, bitcoin, usd-coin). To find an ID from a contract address or name, see references/id_mapping.md.
Quick lookup by contract address (useful for Solana tokens):
python
import httpx
# Look up by Solana contract address
contract = "So11111111111111111111111111111111111111112"
resp = httpx.get(
"https://api.coingecko.com/api/v3/coins/solana/contract/"
+ contract
)
coin = resp.json()
print(f"ID: {coin['id']}, Name: {coin['name']}")Key Limitations
- No real-time data: Prices update every 1-2 minutes on free tier
- Limited Solana coverage: Many newer Solana tokens are not listed
- OHLC granularity: Only 1/7/14/30/90/180/365 day windows, candle size
depends on the window (see references/endpoints.md)
- Historical gaps: Some tokens have missing data for early periods
- Free tier throttling: 30 req/min means batch operations need careful pacing
See references/data_quality.md for detailed notes on data gaps and tier differences.
Files
References
references/endpoints.md— Complete endpoint reference with parameters, response schemas, and rate limitsreferences/id_mapping.md— How to find CoinGecko IDs for tokens, contract address mapping, search tipsreferences/data_quality.md— Data quality notes, historical gaps, free vs pro tier differences
Scripts
scripts/fetch_market_data.py— Fetch top coins, trending tokens, and global stats (supports--demomode)scripts/historical_analysis.py— Fetch historical OHLCV data and compute returns, volatility, drawdown (supports--demomode)
