Blockchain.com Blockchain Data API

openapi: 3.0.3
info:
  title: Blockchain.com Blockchain Data API
  description: |
    Read-only JSON HTTP API for querying Bitcoin blockchain data from Blockchain.com's explorer:
    blocks, transactions, addresses, multi-address summaries, unspent outputs, and the latest block.
    Includes the simple Query API endpoints that return single-value plain-text answers about the
    network (difficulty, block count, total supply, etc.).

    Generated from https://www.blockchain.com/explorer/api/blockchain_api and
    https://www.blockchain.com/explorer/api/q.
  version: '1.0.0'
  contact:
    name: Blockchain.com
    url: https://www.blockchain.com/api
  license:
    name: Blockchain.com API Terms of Service
    url: https://www.blockchain.com/legal/terms
  x-generated-from: documentation
  x-last-validated: '2026-05-30'

servers:
- url: https://blockchain.info
  description: Blockchain.info explorer host (Bitcoin Data API + Query API).

tags:
- name: Blocks
  description: Bitcoin block lookups and the latest block.
- name: Transactions
  description: Bitcoin transaction lookups.
- name: Addresses
  description: Bitcoin address summaries and unspent outputs.
- name: Network
  description: Simple network metrics — difficulty, block height, supply, ETA, averages.

paths:

  # --------------------------------------------------------------
  # BLOCKS
  # --------------------------------------------------------------

  /rawblock/{block_hash}:
    get:
      operationId: getBlock
      summary: Blockchain.com Get a Single Block
      description: Returns detailed information about a specific block identified by its hash.
      tags: [Blocks]
      parameters:
      - name: block_hash
        in: path
        required: true
        description: Bitcoin block hash (64-character hex).
        schema:
          type: string
          example: 0000000000000000000abc...
      - name: format
        in: query
        required: false
        description: If set to `hex`, returns the raw block as a binary hex string.
        schema:
          type: string
          enum: [hex]
      responses:
        '200':
          description: Block detail.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Block'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /block-height/{block_height}:
    get:
      operationId: getBlocksByHeight
      summary: Blockchain.com Get Blocks at a Height
      description: Returns the array of blocks at the specified blockchain height.
      tags: [Blocks]
      parameters:
      - name: block_height
        in: path
        required: true
        description: Block height (non-negative integer).
        schema:
          type: integer
          example: 850000
      - name: format
        in: query
        required: true
        description: Must be `json` to return JSON.
        schema:
          type: string
          enum: [json]
      responses:
        '200':
          description: Blocks at the requested height.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BlockListResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /latestblock:
    get:
      operationId: getLatestBlock
      summary: Blockchain.com Get the Latest Block
      description: Returns the most recent block on the longest chain.
      tags: [Blocks]
      responses:
        '200':
          description: Latest block summary.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LatestBlock'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  # --------------------------------------------------------------
  # TRANSACTIONS
  # --------------------------------------------------------------

  /rawtx/{tx_hash}:
    get:
      operationId: getTransaction
      summary: Blockchain.com Get a Single Transaction
      description: Returns a specific transaction with its inputs, outputs, fees, and block height.
      tags: [Transactions]
      parameters:
      - name: tx_hash
        in: path
        required: true
        description: Bitcoin transaction hash (64-character hex).
        schema:
          type: string
          example: 0e3e2357e806b6cdb1f70b54c3a3a17b6714ee1f0e68bebb44a74b1efd512098
      - name: format
        in: query
        required: false
        description: If set to `hex`, returns the raw transaction as a binary hex string.
        schema:
          type: string
          enum: [hex]
      responses:
        '200':
          description: Transaction detail.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Transaction'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  # --------------------------------------------------------------
  # ADDRESSES
  # --------------------------------------------------------------

  /rawaddr/{bitcoin_address}:
    get:
      operationId: getAddress
      summary: Blockchain.com Get a Single Address
      description: |
        Returns information about a Bitcoin address including total received, total sent, final
        balance, and transactions (paginated).
      tags: [Addresses]
      parameters:
      - name: bitcoin_address
        in: path
        required: true
        description: Bitcoin address (Base58 or Bech32).
        schema:
          type: string
          example: 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa
      - name: limit
        in: query
        required: false
        description: Maximum number of transactions to return (default 50).
        schema:
          type: integer
          default: 50
          maximum: 50
      - name: offset
        in: query
        required: false
        description: Number of transactions to skip for pagination (multiples of 50).
        schema:
          type: integer
          default: 0
      responses:
        '200':
          description: Address detail.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Address'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /multiaddr:
    get:
      operationId: getMultiAddress
      summary: Blockchain.com Get Multi-address Summary
      description: Returns balance and recent transactions for up to multiple addresses at once.
      tags: [Addresses]
      parameters:
      - name: active
        in: query
        required: true
        description: Pipe-delimited Bitcoin addresses (e.g. `addr1|addr2|addr3`).
        schema:
          type: string
          example: 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa|3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy
      - name: n
        in: query
        required: false
        description: Number of recent transactions to return across all addresses (max 100).
        schema:
          type: integer
          default: 50
          maximum: 100
      - name: offset
        in: query
        required: false
        description: Number of transactions to skip for pagination.
        schema:
          type: integer
          default: 0
      responses:
        '200':
          description: Multi-address response.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MultiAddressResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /unspent:
    get:
      operationId: getUnspentOutputs
      summary: Blockchain.com Get Unspent Outputs
      description: Returns the unspent transaction outputs (UTXOs) for one or more addresses.
      tags: [Addresses]
      parameters:
      - name: active
        in: query
        required: true
        description: Pipe-delimited Bitcoin addresses.
        schema:
          type: string
          example: 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa|3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy
      - name: limit
        in: query
        required: false
        description: Maximum number of UTXOs to return (default 250, max 1000).
        schema:
          type: integer
          default: 250
          maximum: 1000
      - name: confirmations
        in: query
        required: false
        description: Minimum confirmations a UTXO must have to be returned.
        schema:
          type: integer
          default: 0
      responses:
        '200':
          description: Unspent outputs.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UnspentResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  # --------------------------------------------------------------
  # SIMPLE QUERY API (text responses)
  # --------------------------------------------------------------

  /q/getdifficulty:
    get:
      operationId: getDifficulty
      summary: Blockchain.com Get Current Difficulty
      description: Current mining difficulty target as a decimal number.
      tags: [Network]
      responses:
        '200':
          description: Difficulty value.
          content:
            text/plain:
              schema:
                type: string
                example: "92671248843810.34"
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /q/getblockcount:
    get:
      operationId: getBlockCount
      summary: Blockchain.com Get Current Block Count
      description: Current block height in the longest chain.
      tags: [Network]
      responses:
        '200':
          description: Block height.
          content:
            text/plain:
              schema:
                type: integer
                example: 851234
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /q/latesthash:
    get:
      operationId: getLatestHash
      summary: Blockchain.com Get the Latest Block Hash
      description: Hash of the most recent block on the longest chain.
      tags: [Network]
      responses:
        '200':
          description: Latest block hash.
          content:
            text/plain:
              schema:
                type: string
                example: 00000000000000000004f4e7a1...
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /q/bcperblock:
    get:
      operationId: getBcPerBlock
      summary: Blockchain.com Get the Current Block Reward
      description: Current block reward in BTC.
      tags: [Network]
      responses:
        '200':
          description: Block reward in BTC.
          content:
            text/plain:
              schema:
                type: number
                example: 3.125
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /q/totalbc:
    get:
      operationId: getTotalBc
      summary: Blockchain.com Get Total Bitcoins in Circulation
      description: Total Bitcoins in circulation (delayed by up to 1 hour), in Satoshi.
      tags: [Network]
      responses:
        '200':
          description: Total supply in Satoshi.
          content:
            text/plain:
              schema:
                type: integer
                format: int64
                example: 1968000000000000
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /q/probability:
    get:
      operationId: getProbability
      summary: Blockchain.com Get Block Solve Probability
      description: Probability of a single hash attempt solving the next block.
      tags: [Network]
      responses:
        '200':
          description: Probability value.
          content:
            text/plain:
              schema:
                type: number
                example: 1.0e-23
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /q/hashestowin:
    get:
      operationId: getHashesToWin
      summary: Blockchain.com Get Hashes Needed to Solve a Block
      description: Average number of hashes required to solve a single block.
      tags: [Network]
      responses:
        '200':
          description: Hashes-to-win value.
          content:
            text/plain:
              schema:
                type: integer
                format: int64
                example: 100000000000000000000000
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /q/nextretarget:
    get:
      operationId: getNextRetarget
      summary: Blockchain.com Get Next Difficulty Retarget Block
      description: Block height of the next difficulty re-target event.
      tags: [Network]
      responses:
        '200':
          description: Block height.
          content:
            text/plain:
              schema:
                type: integer
                example: 851840
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /q/avgtxsize:
    get:
      operationId: getAverageTxSize
      summary: Blockchain.com Get Average Transaction Size
      description: Average transaction size in bytes across the most recent blocks (configurable).
      tags: [Network]
      parameters:
      - name: blocks
        in: query
        required: false
        description: Number of trailing blocks to average over.
        schema:
          type: integer
          default: 1000
      responses:
        '200':
          description: Average transaction size in bytes.
          content:
            text/plain:
              schema:
                type: integer
                example: 412
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /q/avgtxvalue:
    get:
      operationId: getAverageTxValue
      summary: Blockchain.com Get Average Transaction Value
      description: Average transaction value in Satoshi across the most recent blocks (configurable).
      tags: [Network]
      parameters:
      - name: blocks
        in: query
        required: false
        description: Number of trailing blocks to average over (default 1000).
        schema:
          type: integer
          default: 1000
      responses:
        '200':
          description: Average transaction value in Satoshi.
          content:
            text/plain:
              schema:
                type: integer
                format: int64
                example: 18400000
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /q/interval:
    get:
      operationId: getBlockInterval
      summary: Blockchain.com Get Average Interval Between Blocks
      description: Average time between blocks in seconds.
      tags: [Network]
      responses:
        '200':
          description: Interval in seconds.
          content:
            text/plain:
              schema:
                type: number
                example: 612.4
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /q/eta:
    get:
      operationId: getEta
      summary: Blockchain.com Get ETA of the Next Block
      description: Estimated number of seconds until the next block is mined.
      tags: [Network]
      responses:
        '200':
          description: ETA in seconds.
          content:
            text/plain:
              schema:
                type: number
                example: 235.0
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

  /q/avgtxnumber:
    get:
      operationId: getAverageTxNumber
      summary: Blockchain.com Get Average Transactions Per Block
      description: Average number of transactions per block over the most recent blocks.
      tags: [Network]
      parameters:
      - name: blocks
        in: query
        required: false
        description: Number of trailing blocks to average over.
        schema:
          type: integer
          default: 1000
      responses:
        '200':
          description: Average transactions per block.
          content:
            text/plain:
              schema:
                type: integer
                example: 2840
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

components:
  schemas:

    Block:
      type: object
      description: A Bitcoin block including its transactions, header, and chain status.
      properties:
        hash:
          type: string
          description: Block hash.
          example: 00000000000000000004f4e7a1...
        ver:
          type: integer
          description: Block version.
          example: 536870912
        prev_block:
          type: string
          description: Previous block hash.
        mrkl_root:
          type: string
          description: Merkle root.
        time:
          type: integer
          format: int64
          description: Block timestamp (Unix seconds).
          example: 1748609400000
        bits:
          type: integer
          description: Difficulty bits.
          example: 1
        nonce:
          type: integer
          format: int64
          description: Nonce used to mine the block.
          example: 1
        n_tx:
          type: integer
          description: Number of transactions in the block.
          example: 1
        size:
          type: integer
          description: Block size in bytes.
          example: 1
        block_index:
          type: integer
          format: int64
          description: Internal block index.
          example: 1
        main_chain:
          type: boolean
          description: True if this block is part of the main chain.
          example: true
        height:
          type: integer
          description: Block height.
          example: 851234
        tx:
          type: array
          description: List of transactions included in the block.
          items:
            $ref: '#/components/schemas/Transaction'

    BlockListResponse:
      type: object
      description: Wrapper used by `block-height/{height}` returning an array of `Block` objects.
      properties:
        blocks:
          type: array
          items:
            $ref: '#/components/schemas/Block'

    LatestBlock:
      type: object
      description: Lightweight summary of the most recent block.
      properties:
        hash:
          type: string
          description: Block hash.
          example: 00000000000000000004f4e7a18a09b1f8e96d6fb01d9b6fce4d12cb3f8a7e21
        time:
          type: integer
          format: int64
          description: Block timestamp (Unix seconds).
          example: 1748609400000
        block_index:
          type: integer
          format: int64
          description: Internal block index.
          example: 1
        height:
          type: integer
          description: Block height.
          example: 851234
        txIndexes:
          type: array
          description: Internal transaction indexes for transactions in this block.
          items:
            type: integer
            format: int64

            example: 1
    Transaction:
      type: object
      description: A Bitcoin transaction with its inputs and outputs.
      properties:
        hash:
          type: string
          description: Transaction hash.
          example: 00000000000000000004f4e7a18a09b1f8e96d6fb01d9b6fce4d12cb3f8a7e21
        ver:
          type: integer
          description: Transaction version.
          example: 1
        vin_sz:
          type: integer
          description: Number of inputs.
          example: 1
        vout_sz:
          type: integer
          description: Number of outputs.
          example: 1
        size:
          type: integer
          description: Serialized transaction size in bytes.
          example: 1
        weight:
          type: integer
          description: Transaction weight (BIP141).
          example: 1
        fee:
          type: integer
          format: int64
          description: Fee paid in Satoshi.
          example: 1
        relayed_by:
          type: string
          description: IP address that relayed the transaction.
        lock_time:
          type: integer
          format: int64
          description: Lock time (block height or Unix seconds).
          example: 1748609400000
        tx_index:
          type: integer
          format: int64
          description: Internal transaction index.
          example: 1
        double_spend:
          type: boolean
          description: True if the transaction is a known double-spend.
          example: true
        time:
          type: integer
          format: int64
          description: First-seen time (Unix seconds).
          example: 1748609400000
        block_index:
          type: integer
          format: int64
          description: Block index containing the transaction (null if unconfirmed).
          example: 1
        block_height:
          type: integer
          description: Block height containing the transaction (null if unconfirmed).
          example: 851234
        inputs:
          type: array
          description: Transaction inputs.
          items:
            $ref: '#/components/schemas/TxInput'
        out:
          type: array
          description: Transaction outputs.
          items:
            $ref: '#/components/schemas/TxOutput'

    TxInput:
      type: object
      description: A single Bitcoin transaction input.
      properties:
        sequence:
          type: integer
          format: int64
          description: Sequence number.
          example: 1
        witness:
          type: string
          description: SegWit witness data.
        script:
          type: string
          description: Input script (scriptSig) as hex.
        prev_out:
          $ref: '#/components/schemas/TxOutput'

    TxOutput:
      type: object
      description: A single Bitcoin transaction output (a UTXO before it is spent).
      properties:
        type:
          type: integer
          description: Output type indicator.
          example: 1
        spent:
          type: boolean
          description: True if the output has been spent.
          example: true
        value:
          type: integer
          format: int64
          description: Value in Satoshi.
          example: 100000
        spending_outpoints:
          type: array
          description: Outpoints that spent this output (when spent).
          items:
            type: object
            properties:
              tx_index:
                type: integer
                format: int64
              n:
                type: integer
        n:
          type: integer
          description: Output index within the transaction.
          example: 1
        tx_index:
          type: integer
          format: int64
          description: Internal transaction index.
          example: 1
        script:
          type: string
          description: Output script (scriptPubKey) as hex.
        addr:
          type: string
          description: Destination address (when derivable).

    Address:
      type: object
      description: Address summary including balances and transaction history.
      properties:
        hash160:
          type: string
          description: Hash160 representation of the address.
          example: 00000000000000000004f4e7a18a09b1f8e96d6fb01d9b6fce4d12cb3f8a7e21
        address:
          type: string
          description: Bitcoin address.
          example: 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa
        n_tx:
          type: integer
          description: Number of transactions involving this address.
          example: 1
        n_unredeemed:
          type: integer
          description: Number of unredeemed outputs.
          example: 1
        total_received:
          type: integer
          format: int64
          description: Total received in Satoshi.
          example: 1
        total_sent:
          type: integer
          format: int64
          description: Total sent in Satoshi.
          example: 1
        final_balance:
          type: integer
          format: int64
          description: Current balance in Satoshi.
          example: 100000
        txs:
          type: array
          description: Recent transactions involving the address (paginated).
          items:
            $ref: '#/components/schemas/Transaction'

    MultiAddressResponse:
      type: object
      description: Multi-address summary plus recent transactions across all addresses.
      properties:
        addresses:
          type: array
          description: Per-address summary entries.
          items:
            type: object
            properties:
              address:
                type: string
              n_tx:
                type: integer
              total_received:
                type: integer
                format: int64
              total_sent:
                type: integer
                format: int64
              final_balance:
                type: integer
                format: int64
              change_index:
                type: integer
              account_index:
                type: integer
        wallet:
          type: object
          description: Aggregate balances across the supplied addresses.
          properties:
            n_tx:
              type: integer
            n_tx_filtered:
              type: integer
            total_received:
              type: integer
              format: int64
            total_sent:
              type: integer
              format: int64
            final_balance:
              type: integer
              format: int64
        txs:
          type: array
          description: Most recent transactions across all addresses.
          items:
            $ref: '#/components/schemas/Transaction'

    UnspentResponse:
      type: object
      description: Unspent outputs for the requested addresses.
      properties:
        notice:
          type: string
          description: Optional explanatory notice.
        unspent_outputs:
          type: array
          description: List of UTXOs.
          items:
            $ref: '#/components/schemas/UnspentOutput'

    UnspentOutput:
      type: object
      description: A single UTXO owned by one of the requested addresses.
      properties:
        tx_hash:
          type: string
          description: Hash of the funding transaction (little-endian).
          example: 00000000000000000004f4e7a18a09b1f8e96d6fb01d9b6fce4d12cb3f8a7e21
        tx_hash_big_endian:
          type: string
          description: Hash of the funding transaction (big-endian).
          example: 00000000000000000004f4e7a18a09b1f8e96d6fb01d9b6fce4d12cb3f8a7e21
        tx_output_n:
          type: integer
          description: Output index within the funding transaction.
          example: 1
        script:
          type: string
          description: Output script (scriptPubKey) as hex.
        value:
          type: integer
          format: int64
          description: Output value in Satoshi.
          example: 100000
        value_hex:
          type: string
          description: Output value in hex.
        confirmations:
          type: integer
          description: Number of confirmations.
          example: 1
        tx_index:
          type: integer
          format: int64
          description: Internal transaction index.
          example: 1