Some API calls are available with CORS headers if you add a &cors=true paramter to the GET request

Please limit your queries to a maximum of 1 every 10 seconds. All bitcoin values are in Satoshi i.e. divide by 100000000 to get the amount in BTC

Real-Time

• getdifficulty - Current difficulty target as a decimal number
• getblockcount - Current block height in the longest chain
• latesthash - Hash of the latest block
• bcperblock - Current block reward in BTC
• totalbc - Total Bitcoins in circulation (delayed by up to 1 hour])
• probability - Probability of finding a valid block each hash attempt
• hashestowin - Average number of hash attempts needed to solve a block
• nextretarget - Block height of the next difficulty retarget

• avgtxsize - Average transaction size for the past 1000 blocks. Change the number of blocks by passing an integer as the second argument e.g. avgtxsize/2000
• avgtxvalue - Average transaction value (1000 Default)
• interval - average time between blocks in seconds
• eta - estimated time until the next block (in seconds)
• avgtxnumber - Average number of transactions per block (100 Default)

Address Lookups

To filter by x number of confirmations include the confirmations parameter

e.g. /q/addressbalance/1EzwoHtiXB4iFwedPr49iywjZn2nnekhoj?confirmations=6

to only include transactions with 6 or more confirmations. This is extremely important if you are processing valuable transactions.

• getreceivedbyaddress/Address - Get the total number of bitcoins received by an address (in satoshi). Multiple addresses separated by | Do not use to process payments without the confirmations parameter

  Add the parameters start_time and end_time to restrict received by to a specific time period. Provided times should be a unix timestamp in milliseconds. Multiple addresses separated by |

• getsentbyaddress/Address - Get the total number of bitcoins send by an address (in satoshi). Multiple addresses separated by | Do not use to process payments without the confirmations parameter
• addressbalance/Address - Get the balance of an address (in satoshi). Multiple addresses separated by | Do not use to process payments without the confirmations parameter
• addressfirstseen/Address - Timestamp of the block an address was first confirmed in.

Transaction Lookups

• txtotalbtcoutput/TxHash - Get total output value of a transaction (in satoshi)
• txtotalbtcinput/TxHash - Get total input value of a transaction (in satoshi)
• txfee/TxHash - Get fee included in a transaction (in satoshi)
• txresult/TxHash/Address - Calculate the result of a transaction sent or received to Address. Multiple addresses separated by |

Tools

• addresstohash/Address - Converts a bitcoin address to a hash 160
• hashtoaddress/Hash - Converts a hash 160 to a bitcoin address
• hashpubkey/Pubkey - Converts a public key to a hash 160
• addrpubkey/Pubkey - Converts a public key to an Address
• pubkeyaddr/Address - Converts an address to public key (if available)

Misc

• unconfirmedcount - Number of pending unconfirmed transactions
• 24hrprice - 24 hour weighted price from the largest exchanges
• marketcap - USD market cap (based on 24 hour weighted price)
• 24hrtransactioncount - Number of transactions in the past 24 hours
• 24hrbtcsent - Number of btc sent in the last 24 hours (in satoshi)
• hashrate - Estimated network hash rate in gigahash
• rejected - Lookup the reason why the provided tx or block hash was rejected (if any)