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The Esplora API is a RESTful service designed by Blockstream that provides a lightweight and efficient HTTP interface for accessing Bitcoin data including blocks, transactions and addresses. Esplora is designed for performance and ease of integration, making it ideal for explorers, wallets, and backend services that need fast blockchain reads without running a full node RPC server.
The Maestro Esplora API offers a forked Mempool.Space instance, with support for both Bitcoin mainnet and Bitcoin testnet4. Repo: https://github.com/maestro-org/mempool

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Service Availability

The Esplora service is available on the following blockchains:
ServiceBitcoinCardanoDogecoin
EsploraAPI Reference--

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Key Features

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Transactions

  • Fetch transaction details, raw hex, and status.
  • Retrieve merkle proofs (both bitcoind and Electrum style).
  • Broadcast raw transactions.
  • Check spending status of outputs.

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Addresses & Scripthashes

  • Lookup balances and stats for addresses and scripthashes.
  • View confirmed and mempool transaction history.
  • Fetch associated UTXOs.
  • Search by address prefix.

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Blocks

  • Get full block details including headers, transactions, txids.
  • Access block metadata like height, weight, merkle root.
  • Fetch block status and raw binary representation.

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Mempool

  • View mempool stats: total count, vsize, fees.
  • Get full mempool txid list and most recent entries.
  • Access fee-rate distribution histogram.

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Fee Estimates

  • Retrieve estimated fee rates for confirmation targets (1-1008 blocks).

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Use Cases

  • Build block explorers and analytics dashboards.
  • Monitor transactions and fee trends.
  • Query UTXOs and spending data for wallets.
  • Implement mempool-aware transaction trackers.