A web based interface to the Bitcoin API JSON-RPC

Command: sendmany

The sendmany RPC creates and broadcasts a transaction which sends outputs to multiple addresses.

Parameter #1—from account
Parameter #2—the addresses and amounts to pay
Parameter #3—minimum confirmations
Parameter #4—a comment
Parameter #5-subtractfeefromamount is missing from the bitcoin RPC GitHub Issue #6500
Result—a TXID of the sent transaction

Blank for default account. The name of the account from which the bitcoins should be spent. Use an empty string (“”) for the default account. Bitcoin Core will ensure the account has sufficient bitcoins to pay the total amount in the outputs field described below (but the transaction fee paid is not included in the calculation, so an account can spend a total of its balance plus the transaction fee).
Click "+" to add more outputs. A key/value pair with a base58check-encoded string containing the P2PKH or P2SH address to pay as the key, and an amount of bitcoins to pay as the value.
 
The minimum number of confirmations an incoming transaction must have for its outputs to be credited to this account’s balance. Outgoing transactions are always counted, as are move transactions made with the move RPC. If an account doesn’t have a balance high enough to pay for this transaction, the payment will be rejected. Use 0 to spend unconfirmed incoming payments. Default is 1.
A locally-stored (not broadcast) comment assigned to this transaction. Default is no comment.
null
sendmany "fromaccount" {"address":amount,...} ( minconf "comment" ["address",...] )

Send multiple times. Amounts are double-precision floating point numbers.
Requires wallet passphrase to be set with walletpassphrase call.

Arguments:
1. "fromaccount"         (string, required) DEPRECATED. The account to send the funds from. Should be "" for the default account
2. "amounts"             (string, required) A json object with addresses and amounts
    {
      "address":amount   (numeric or string) The bitcoin address is the key, the numeric amount (can be string) in BTC is the value
      ,...
    }
3. minconf                 (numeric, optional, default=1) Only use the balance confirmed at least this many times.
4. "comment"             (string, optional) A comment
5. subtractfeefrom         (array, optional) A json array with addresses.
                           The fee will be equally deducted from the amount of each selected address.
                           Those recipients will receive less bitcoins than you enter in their corresponding amount field.
                           If no addresses are specified here, the sender pays the fee.
    [
      "address"          (string) Subtract fee from this address
      ,...
    ]

Result:
"txid"                   (string) The transaction id for the send. Only 1 transaction is created regardless of 
                                    the number of addresses.

Examples:

Send two amounts to two different addresses:
> bitcoin-cli sendmany "" "{\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\":0.01,\"1353tsE8YMTA4EuV7dgUXGjNFf9KpVvKHz\":0.02}"

Send two amounts to two different addresses setting the confirmation and comment:
> bitcoin-cli sendmany "" "{\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\":0.01,\"1353tsE8YMTA4EuV7dgUXGjNFf9KpVvKHz\":0.02}" 6 "testing"

Send two amounts to two different addresses, subtract fee from amount:
> bitcoin-cli sendmany "" "{\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\":0.01,\"1353tsE8YMTA4EuV7dgUXGjNFf9KpVvKHz\":0.02}" 1 "" "[\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\",\"1353tsE8YMTA4EuV7dgUXGjNFf9KpVvKHz\"]"

As a json rpc call
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "sendmany", "params": ["", "{\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\":0.01,\"1353tsE8YMTA4EuV7dgUXGjNFf9KpVvKHz\":0.02}", 6, "testing"] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/