Glossary OS

Plain meaning

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The pattern of scheduling and triggering on-chain program instructions based on time intervals, cron expressions, or conditional state changes without manual intervention. On Solana, automation was pioneered by Clockwork (now sunset) using on-chain Thread accounts and has evolved toward off-chain keeper bot architectures where backend services monitor chain state and submit transactions when trigger conditions are met.

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RPCs, validators, snapshots, indexing, and network plumbing.

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Program Automation (program-automation)
Category: Infrastructure
Definition: The pattern of scheduling and triggering on-chain program instructions based on time intervals, cron expressions, or conditional state changes without manual intervention. On Solana, automation was pioneered by Clockwork (now sunset) using on-chain Thread accounts and has evolved toward off-chain keeper bot architectures where backend services monitor chain state and submit transactions when trigger conditions are met.
Related: Clockwork, Cron (Time-Based Scheduling)

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Clockwork

A deprecated Solana on-chain automation protocol (by Clockwork Labs, now sunset) that allowed developers to schedule and trigger smart contract instructions based on time (cron expressions) or on-chain conditions using a network of automation worker threads running alongside validators. Clockwork introduced the concept of Thread accounts that encoded trigger conditions and instruction targets directly on-chain, and while it has been discontinued, it pioneered the automation primitive model later explored by projects like Turbin3 and off-chain keeper bot architectures.

Open term

Branch

Cron (Time-Based Scheduling)

A time-based job scheduling concept originating from Unix systems, where tasks are defined to run at specific intervals using cron expressions (e.g., '0 */6 * * *' for every 6 hours). In blockchain contexts, cron-like scheduling is used to trigger on-chain operations such as reward distributions, oracle updates, and automated rebalancing at regular intervals, typically implemented through off-chain keeper services or on-chain automation protocols.

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Infrastructure

Clockwork

A deprecated Solana on-chain automation protocol (by Clockwork Labs, now sunset) that allowed developers to schedule and trigger smart contract instructions based on time (cron expressions) or on-chain conditions using a network of automation worker threads running alongside validators. Clockwork introduced the concept of Thread accounts that encoded trigger conditions and instruction targets directly on-chain, and while it has been discontinued, it pioneered the automation primitive model later explored by projects like Turbin3 and off-chain keeper bot architectures.

Open term

Programming Fundamentals

Cron (Time-Based Scheduling)

A time-based job scheduling concept originating from Unix systems, where tasks are defined to run at specific intervals using cron expressions (e.g., '0 */6 * * *' for every 6 hours). In blockchain contexts, cron-like scheduling is used to trigger on-chain operations such as reward distributions, oracle updates, and automated rebalancing at regular intervals, typically implemented through off-chain keeper services or on-chain automation protocols.

Open term

Infrastructure

QuickNode

A multi-chain blockchain infrastructure provider that offers globally distributed Solana RPC and WebSocket endpoints, add-on marketplace integrations (including DAS, token APIs, and priority fee estimation), and performance-oriented features like endpoint analytics and dedicated node plans. QuickNode provides Solana developers with low-latency access to mainnet-beta, testnet, and devnet through a SLA-backed managed service model.

Open term

Infrastructure

Priority Fee API

An RPC API (primarily Helius's getPriorityFeeEstimate) that calculates optimal priority fee recommendations based on real-time network congestion and historical fee data. Priority fees are priced in microlamports per compute unit. The API returns tiered estimates (low, medium, high, very high) to help developers balance cost and confirmation speed.

Open term

Related terms

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Infrastructureclockwork

Clockwork

A deprecated Solana on-chain automation protocol (by Clockwork Labs, now sunset) that allowed developers to schedule and trigger smart contract instructions based on time (cron expressions) or on-chain conditions using a network of automation worker threads running alongside validators. Clockwork introduced the concept of Thread accounts that encoded trigger conditions and instruction targets directly on-chain, and while it has been discontinued, it pioneered the automation primitive model later explored by projects like Turbin3 and off-chain keeper bot architectures.

Open term

Programming Fundamentalscron

Cron (Time-Based Scheduling)

A time-based job scheduling concept originating from Unix systems, where tasks are defined to run at specific intervals using cron expressions (e.g., '0 */6 * * *' for every 6 hours). In blockchain contexts, cron-like scheduling is used to trigger on-chain operations such as reward distributions, oracle updates, and automated rebalancing at regular intervals, typically implemented through off-chain keeper services or on-chain automation protocols.

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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