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JSON-RPC Interface
The headless daemon bitcoind has the JSON-RPC API enabled by default, the GUI
bitcoin-qt has it disabled by default. This can be changed with the -server
option. In the GUI it is possible to execute RPC methods in the Debug Console
Dialog.
RPC consistency guarantees
State that can be queried via RPCs is guaranteed to be at least up-to-date with the chain state immediately prior to the call's execution. However, the state returned by RPCs that reflect the mempool may not be up-to-date with the current mempool state.
Transaction Pool
The mempool state returned via an RPC is consistent with itself and with the chain state at the time of the call. Thus, the mempool state only encompasses transactions that are considered mine-able by the node at the time of the RPC.
The mempool state returned via an RPC reflects all effects of mempool and chain state related RPCs that returned prior to this call.
Wallet
The wallet state returned via an RPC is consistent with itself and with the chain state at the time of the call.
Wallet RPCs will return the latest chain state consistent with prior non-wallet RPCs. The effects of all blocks (and transactions in blocks) at the time of the call is reflected in the state of all wallet transactions. For example, if a block contains transactions that conflicted with mempool transactions, the wallet would reflect the removal of these mempool transactions in the state.
However, the wallet may not be up-to-date with the current state of the mempool or the state of the mempool by an RPC that returned before this RPC. For example, a wallet transaction that was BIP-125-replaced in the mempool prior to this RPC may not yet be reflected as such in this RPC response.