BlockFleaBlockFlea
RPC / Nodes

Mempool.space API

REST and WebSocket API from Mempool.space (The Mempool Open Source Project). Provides real-time fee estimates, mempool stats, transaction broadcasting, UTXO lookups, block data, and Lightning Network stats. Free, no API key required. The developer standard for fee estimation and transaction monitoring in Bitcoin wallets and services.

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Supported Chains

Bitcoin

Best For

Mempool.space API is useful for builders evaluating RPC / Nodes across Bitcoin.

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