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Plain meaning

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Optional filter objects passed to getProgramAccounts that narrow results by comparing raw bytes in account data. A memcmp filter specifies a byte offset and an expected bytes value (base58 or base64 encoded), enabling field-level matching such as filtering all token accounts by a specific mint address; a dataSize filter restricts results to accounts whose data length equals an exact byte count. Combining both filters is the standard pattern for efficiently querying discriminated Anchor accounts or specific SPL token account sets.

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Account Filter (memcmp / dataSize) (account-filter)
Category: Infrastructure
Definition: Optional filter objects passed to getProgramAccounts that narrow results by comparing raw bytes in account data. A memcmp filter specifies a byte offset and an expected bytes value (base58 or base64 encoded), enabling field-level matching such as filtering all token accounts by a specific mint address; a dataSize filter restricts results to accounts whose data length equals an exact byte count. Combining both filters is the standard pattern for efficiently querying discriminated Anchor accounts or specific SPL token account sets.
Related: getProgramAccounts (GPA), RPC Methods

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getProgramAccounts (GPA)

An RPC method that scans all accounts owned by a given program and returns those matching optional memcmp (memory compare) and dataSize filters, making it the standard way to discover all state accounts for a protocol (e.g., all open order books, all user positions). GPA is resource-intensive because it performs a full account-store scan on the RPC node; many public endpoints rate-limit or disable it, which is why purpose-built indexers and services like Helius are used in production to serve GPA-equivalent queries at scale.

Program

Open term

Branch

RPC Methods

The enumerated JSON-RPC endpoints exposed by Solana nodes, covering account queries (getAccountInfo, getMultipleAccounts, getProgramAccounts), block and transaction retrieval (getBlock, getTransaction), cluster metadata (getEpochInfo, getSlot, getVersion), and transaction submission (sendTransaction, simulateTransaction). Methods accept a Commitment parameter (processed, confirmed, finalized) to control the recency-vs-safety tradeoff of returned data.

RPC (Remote Procedure Call)getAccountInfo

Open term

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Infrastructure

getProgramAccounts (GPA)

An RPC method that scans all accounts owned by a given program and returns those matching optional memcmp (memory compare) and dataSize filters, making it the standard way to discover all state accounts for a protocol (e.g., all open order books, all user positions). GPA is resource-intensive because it performs a full account-store scan on the RPC node; many public endpoints rate-limit or disable it, which is why purpose-built indexers and services like Helius are used in production to serve GPA-equivalent queries at scale.

Open term

Infrastructure

RPC Methods

The enumerated JSON-RPC endpoints exposed by Solana nodes, covering account queries (getAccountInfo, getMultipleAccounts, getProgramAccounts), block and transaction retrieval (getBlock, getTransaction), cluster metadata (getEpochInfo, getSlot, getVersion), and transaction submission (sendTransaction, simulateTransaction). Methods accept a Commitment parameter (processed, confirmed, finalized) to control the recency-vs-safety tradeoff of returned data.

Open term

Infrastructure

accountSubscribe

A WebSocket subscription method that pushes a notification to the client every time the data or lamport balance of a specified account changes, delivering the updated AccountInfo payload at the configured commitment level. It is commonly used by UIs to reactively update token balances, NFT ownership, or program state without polling, and each subscription is referenced by a numeric subscription ID returned upon successful registration.

Open term

Infrastructure

RPC (Remote Procedure Call)

The JSON-RPC 2.0 protocol interface through which clients communicate with Solana nodes to query chain state, submit transactions, and subscribe to events. Solana exposes a rich set of HTTP and WebSocket endpoints (e.g., getAccountInfo, sendTransaction) that abstract direct peer-to-peer network participation, making RPC the primary integration point for wallets, dApps, and indexers.

Open term

Related terms

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Infrastructureget-program-accounts

getProgramAccounts (GPA)

An RPC method that scans all accounts owned by a given program and returns those matching optional memcmp (memory compare) and dataSize filters, making it the standard way to discover all state accounts for a protocol (e.g., all open order books, all user positions). GPA is resource-intensive because it performs a full account-store scan on the RPC node; many public endpoints rate-limit or disable it, which is why purpose-built indexers and services like Helius are used in production to serve GPA-equivalent queries at scale.

Open term

Infrastructurerpc-methods

RPC Methods

The enumerated JSON-RPC endpoints exposed by Solana nodes, covering account queries (getAccountInfo, getMultipleAccounts, getProgramAccounts), block and transaction retrieval (getBlock, getTransaction), cluster metadata (getEpochInfo, getSlot, getVersion), and transaction submission (sendTransaction, simulateTransaction). Methods accept a Commitment parameter (processed, confirmed, finalized) to control the recency-vs-safety tradeoff of returned data.

Open term

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Infrastructure

RPC (Remote Procedure Call)

The JSON-RPC 2.0 protocol interface through which clients communicate with Solana nodes to query chain state, submit transactions, and subscribe to events. Solana exposes a rich set of HTTP and WebSocket endpoints (e.g., getAccountInfo, sendTransaction) that abstract direct peer-to-peer network participation, making RPC the primary integration point for wallets, dApps, and indexers.

Open term

Infrastructure

RPC Node

A Solana full node that stores ledger state and serves JSON-RPC and WebSocket requests from clients without participating in consensus or voting. RPC nodes must replay every transaction to maintain an accurate account state database, and high-throughput deployments typically run dedicated RPC nodes with large SSDs, high RAM (256 GB+), and high-bandwidth network connections to handle concurrent client load without impacting validator performance.

Open term

Infrastructure

RPC Methods

The enumerated JSON-RPC endpoints exposed by Solana nodes, covering account queries (getAccountInfo, getMultipleAccounts, getProgramAccounts), block and transaction retrieval (getBlock, getTransaction), cluster metadata (getEpochInfo, getSlot, getVersion), and transaction submission (sendTransaction, simulateTransaction). Methods accept a Commitment parameter (processed, confirmed, finalized) to control the recency-vs-safety tradeoff of returned data.

Open term

Infrastructure

getAccountInfo

An RPC method that returns the complete on-chain state of a single account identified by its base-58 public key, including its lamport balance, owner program, executable flag, rent epoch, and raw data payload encoded as base64 or base58. It is the most fundamental read primitive in Solana development and is called at the specified commitment level, with the data field being null if the account does not exist.

Open term