Blockchain Data API

Some API calls are available with

if you add a &cors=true parameter to the GET request

Single Block

https://blockchain.info/rawblock/$block_hash
You can also request the block to return in binary form (Hex encoded) using ?format=hex

{
  "hash": "0000000000000bae09a7a393a8acded75aa67e46cb81f7acaa5ad94f9eacd103",
  "ver": 1,
  "prev_block": "00000000000007d0f98d9edca880a6c124e25095712df8952e0439ac7409738a",
  "mrkl_root": "935aa0ed2e29a4b81e0c995c39e06995ecce7ddbebb26ed32d550a72e8200bf5",
  "time": 1322131230,
  "bits": 437129626,
  "nonce": 2964215930,
  "n_tx": 22,
  "size": 9195,
  "block_index": 818044,
  "main_chain": true,
  "height": 154595,
  "received_time": 1322131301,
  "relayed_by": "108.60.208.156",
  "tx": [
    "--Array of Transactions--"
  ]
}

Single Transaction

https://blockchain.info/rawtx/$tx_hash
You can also request the transaction to return in binary form (Hex encoded) using ?format=hex

{
  "hash": "b6f6991d03df0e2e04dafffcd6bc418aac66049e2cd74b80f14ac86db1e3f0da",
  "ver": 1,
  "vin_sz": 1,
  "vout_sz": 2,
  "lock_time": "Unavailable",
  "size": 258,
  "relayed_by": "64.179.201.80",
  "block_height": 12200,
  "tx_index": "12563028",
  "inputs": [
    {
      "prev_out": {
        "hash": "a3e2bcc9a5f776112497a32b05f4b9e5b2405ed9",
        "value": "100000000",
        "tx_index": "12554260",
        "n": "2"
      },
      "script": "76a914641ad5051edd97029a003fe9efb29359fcee409d88ac"
    }
  ],
  "out": [
    {
      "value": "98000000",
      "hash": "29d6a3540acfa0a950bef2bfdc75cd51c24390fd",
      "script": "76a914641ad5051edd97029a003fe9efb29359fcee409d88ac"
    },
    {
      "value": "2000000",
      "hash": "17b5038a413f5c5ee288caa64cfab35a0c01914e",
      "script": "76a914641ad5051edd97029a003fe9efb29359fcee409d88ac"
    }
  ]
}

Chart Data

https://blockchain.info/charts/$chart-type?format=json

{
  "values": [
    {
      "x": 1290602498,
      "y": 1309696.2116000003
    }
  ]
}

Block Height

https://blockchain.info/block-height/$block_height?format=json

{
  "blocks": [
    "--Array Of Blocks at the specified height--"
  ]
}

Single Address

https://blockchain.info/rawaddr/$bitcoin_address
Address can be base58 or hash160
Optional limit parameter to show n transactions e.g. &limit=50 (Default: 50, Max: 50)
Optional offset parameter to skip the first n transactions e.g. &offset=100 (Page 2 for limit 50)

{
  "hash160": "660d4ef3a743e3e696ad990364e555c271ad504b",
  "address": "1AJbsFZ64EpEfS5UAjAfcUG8pH8Jn3rn1F",
  "n_tx": 17,
  "n_unredeemed": 2,
  "total_received": 1031350000,
  "total_sent": 931250000,
  "final_balance": 100100000,
  "txs": [
    "--Array of Transactions--"
  ]
}

Multi Address

https://blockchain.info/multiaddr?active=$address|$address
Multiple Addresses Allowed separated by "|"
Address can be base58 or xpub
Optional limit parameter to show n transactions e.g. &n=50 (Default: 50, Max: 100)
Optional offset parameter to skip the first n transactions e.g. &offset=100 (Page 2 for limit 50)

{
  "addresses": [
    {
      "hash160": "641ad5051edd97029a003fe9efb29359fcee409d",
      "address": "1A8JiWcwvpY7tAopUkSnGuEYHmzGYfZPiq",
      "n_tx": 4,
      "total_received": 1401000000,
      "total_sent": 1000000,
      "final_balance": 1400000000
    },
    {
      "hash160": "ddbeb8b1a5d54975ee5779cf64573081a89710e5",
      "address": "1MDUoxL1bGvMxhuoDYx6i11ePytECAk9QK",
      "n_tx": 0,
      "total_received": 0,
      "total_sent": 0,
      "final_balance": 0
    }
  ],
  "txs": [
    "--Latest 50 Transactions--"
  ]
}

Unspent Outputs

https://blockchain.info/unspent?active=$address
Multiple Addresses Allowed separated by "|"
Address can be base58 or xpub
Optional limit parameter to show n transactions e.g. &limit=50 (Default: 250, Max: 1000)
Optional confirmations parameter to limit the minimum confirmations e.g. &confirmations=6

The tx hash is in reverse byte order. What this means is that in order to get the html transaction hash from the JSON tx hash for the following transaction, you need to decode the hex. This will produce a binary output, which you need to reverse (the last 8bits/1byte move to the front, second to last 8bits/1byte needs to be moved to second, etc.). Then once the reversed bytes are decoded, you will get the html transaction hash.

{
  "unspent_outputs": [
    {
      "tx_age": "1322659106",
      "tx_hash": "e6452a2cb71aa864aaa959e647e7a4726a22e640560f199f79b56b5502114c37",
      "tx_index": "12790219",
      "tx_output_n": "0",
      "script": "76a914641ad5051edd97029a003fe9efb29359fcee409d88ac",
      "value": "5000661330"
    }
  ]
}

Balance

https://blockchain.info/balance?active=$address
Multiple Addresses Allowed separated by "|"
Address can be base58 or xpub

List the balance summary of each address listed.

{
  "1MDUoxL1bGvMxhuoDYx6i11ePytECAk9QK": {
    "final_balance": 0,
    "n_tx": 0,
    "total_received": 0
  },
  "15EW3AMRm2yP6LEF5YKKLYwvphy3DmMqN6": {
    "final_balance": 0,
    "n_tx": 2,
    "total_received": 310630609
  }
}

Latest Block

https://blockchain.info/latestblock

{
  "hash": "0000000000000538200a48202ca6340e983646ca088c7618ae82d68e0c76ef5a",
  "time": 1325794737,
  "block_index": 841841,
  "height": 160778,
  "txIndexes": [
    13950369,
    13950510,
    13951472
  ]
}

Unconfirmed Transactions

https://blockchain.info/unconfirmed-transactions?format=json

{
  "txs": [
    "--Array of Transactions--"
  ]
}

Blocks

Blocks for one day: https://blockchain.info/blocks/$time_in_milliseconds?format=json
Blocks for specific pool: https://blockchain.info/blocks/$pool_name?format=json

{
  "blocks": [
    {
      "height": 166107,
      "hash": "00000000000003823fa3667d833a354a437bdecf725f1358b17f949c991bfe0a",
      "time": 1328830483
    },
    {
      "height": 166104,
      "hash": "00000000000008a34f292bfe3098b6eb40d9fd40db65d29dc0ee6fe5fa7d7995",
      "time": 1328828041
    }
  ]
}

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