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Crypto API is considered the Top Blockchain API provider on the market. It is comprised of 3 APIs: Blockchain APIs (BaaS), Crypto Market Data APIs and Exchanges & wallets account management APIs. With Crypto APIs you have all you need in one place in the world of blockchain-based applications. The company behind the Crypto API provides a ready-to-use integration with top 10+ blockchain protocols, but also gives you access to historical data, supports the sending of a signed transaction (where you keep the private keys on your side)