Etherscan
Etherscan · Open & public data
Ethereum block explorer and multichain REST API exposing balances, transactions, token transfers, verified contract source, logs and gas data
ProprietaryFreemiumPaidNov 2, 2026
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Kraken API
Payward, Inc. (Kraken) · Financial analysis & investing
REST, WebSocket and FIX interfaces to the Kraken cryptocurrency exchange for market data, spot and derivatives trading and account management
ProprietaryFreeUsage-basedNov 2, 2026
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