For accurate cryptocurrency data in Excel financial modeling: Crypto Exchanges: Use Binance, Coinbase, and Kraken APIs for real-time data. Data Aggregators: Consider CoinGecko, CoinMarketCap, and their APIs. Blockchain Analytics: Glassnode, Nansen for on-chain insights. Market Data: CryptoCompare, Messari, and their APIs. Blockchain Explorers: Etherscan, Blockchair for blockchain-specific data.