For verifying crypto coin data, here's what I actually use and recommend:
Free tools, no account needed:CoinGecko API (api.coingecko.com)
- Free tier: 50 calls/minute
- Returns price, market cap, 24h change, volume for any listed coin
- No API key required for basic queries
- Works directly with Python's urllib (no extra libraries needed)
DexScreener (dexscreener.com)
- For DEX pairs across 50+ chains
- Liquidity, volume, price chart, holders — all in one place
- Free with no login
Etherscan / BSCScan / Polygonscan- For verifying on-chain transaction history
- Check if a wallet is a contract, if a token has mint/pause functions enabled
- Free API tier available (100k calls/day)
For a DIY solution (quick Python tracker):If you want a simple script to track your portfolio values in real time:
import urllib.request, json
def get_prices(coins):
url = f"https://api.coingecko.com/api/v3/simple/price?ids={','.join(coins)}&vs_currencies=usd&include_24hr_change=true"
req = urllib.request.Request(url, headers={"User-Agent": "Mozilla/5.0"})
with urllib.request.urlopen(req, timeout=10) as r:
return json.loads(r.read())
holdings = {"bitcoin": 0.1, "ethereum": 1.5, "solana": 20}
prices = get_prices(list(holdings))
for coin, amt in holdings.items():
p = prices[coin]["usd"]
chg = prices[coin]["usd_24h_change"]
print(f"{coin.upper()}: ${p:,.2f} ({chg:+.1f}%) | Value: ${p*amt:,.2f}")
This pulls live data directly from CoinGecko — no API key, no setup beyond Python standard library.
[I also build custom Python tools for crypto tracking/automation if you need something more specific — happy to discuss via PM]