Programming Fundamentals

API (Application Programming Interface)

A defined interface through which software components communicate. REST APIs use HTTP methods (GET, POST) with JSON payloads. Solana uses JSON-RPC APIs where clients send method calls (getAccountInfo, sendTransaction) to validator nodes. GraphQL APIs (used by some indexers) allow clients to request exactly the data they need in a single query.

IDapi-generalAliasAPI

Plain meaning

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A defined interface through which software components communicate. REST APIs use HTTP methods (GET, POST) with JSON payloads. Solana uses JSON-RPC APIs where clients send method calls (getAccountInfo, sendTransaction) to validator nodes. GraphQL APIs (used by some indexers) allow clients to request exactly the data they need in a single query.

Mental model

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Technical context

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Serialization, memory, data structures, and core engineering basics.

Why builders care

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This term unlocks adjacent concepts quickly, so it works best when you treat it as a junction instead of an isolated definition.

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API (Application Programming Interface) (api-general)
Category: Programming Fundamentals
Definition: A defined interface through which software components communicate. REST APIs use HTTP methods (GET, POST) with JSON payloads. Solana uses JSON-RPC APIs where clients send method calls (getAccountInfo, sendTransaction) to validator nodes. GraphQL APIs (used by some indexers) allow clients to request exactly the data they need in a single query.
Aliases: API
Related: RPC (Remote Procedure Call), JSON-RPC
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Concept graph

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Branch

RPC (Remote Procedure Call)

The API interface for interacting with a blockchain node. Clients send JSON-RPC requests to read account state, submit transactions, and subscribe to events. Solana RPC methods include getAccountInfo, getBalance, sendTransaction, and simulateTransaction. Public RPCs have rate limits; production dApps use dedicated providers (Helius, Triton, QuickNode).

Branch

JSON-RPC

A stateless, lightweight remote procedure call protocol using JSON encoding. Clients send a JSON object with method name, params, and id; servers respond with result or error. Solana and Ethereum both expose JSON-RPC APIs for blockchain interaction. Example: {method: 'getBalance', params: ['pubkey...'], id: 1}. WebSocket variants support pub/sub for real-time updates.

Next concepts to explore

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Web3

RPC (Remote Procedure Call)

The API interface for interacting with a blockchain node. Clients send JSON-RPC requests to read account state, submit transactions, and subscribe to events. Solana RPC methods include getAccountInfo, getBalance, sendTransaction, and simulateTransaction. Public RPCs have rate limits; production dApps use dedicated providers (Helius, Triton, QuickNode).

Programming Fundamentals

JSON-RPC

A stateless, lightweight remote procedure call protocol using JSON encoding. Clients send a JSON object with method name, params, and id; servers respond with result or error. Solana and Ethereum both expose JSON-RPC APIs for blockchain interaction. Example: {method: 'getBalance', params: ['pubkey...'], id: 1}. WebSocket variants support pub/sub for real-time updates.

Programming Fundamentals

AVX-512 (SIMD Instructions)

Intel's 512-bit Advanced Vector Extensions enabling single-instruction-multiple-data parallel processing. Firedancer leverages AVX-512 for high-throughput signature verification, hashing, and data processing, executing operations on 16 32-bit values simultaneously. This hardware-level parallelism is key to achieving millions of signature verifications per second.

Programming Fundamentals

Amdahl's Law

Theoretical limit on parallel speedup: if P% of a task is parallelizable, maximum speedup is 1/(1-P + P/N) for N processors. Limits Sealevel's gains — transactions touching the same account must serialize. Solana mitigates this through account-level locking (maximizing P) and local fee markets (pricing serial contention).

Commonly confused with

Terms nearby in vocabulary, acronym, or conceptual neighborhood.

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Programming Fundamentalscli-general

CLI (Command-Line Interface)

A text-based interface for interacting with software through terminal commands. Solana provides the `solana` CLI for account management, transfers, and deployments, plus `anchor` CLI for framework operations. CLIs are scriptable and essential for automation, CI/CD pipelines, and advanced operations not available in GUIs.

AliasCLI
Related terms

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Web3rpc-general

RPC (Remote Procedure Call)

The API interface for interacting with a blockchain node. Clients send JSON-RPC requests to read account state, submit transactions, and subscribe to events. Solana RPC methods include getAccountInfo, getBalance, sendTransaction, and simulateTransaction. Public RPCs have rate limits; production dApps use dedicated providers (Helius, Triton, QuickNode).

Programming Fundamentalsjson-rpc

JSON-RPC

A stateless, lightweight remote procedure call protocol using JSON encoding. Clients send a JSON object with method name, params, and id; servers respond with result or error. Solana and Ethereum both expose JSON-RPC APIs for blockchain interaction. Example: {method: 'getBalance', params: ['pubkey...'], id: 1}. WebSocket variants support pub/sub for real-time updates.

More in category

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Programming Fundamentals

Rust

A systems programming language emphasizing memory safety, zero-cost abstractions, and concurrency without a garbage collector. Rust uses an ownership model with borrow checking at compile time to prevent data races and null pointer bugs. It is the primary language for Solana program development (via Anchor or native solana-program crate) and the Agave validator client.

Programming Fundamentals

TypeScript

A statically typed superset of JavaScript that compiles to plain JavaScript. TypeScript adds type annotations, interfaces, generics, and enums to catch errors at compile time. It is the standard language for Solana client-side development—wallet adapters, dApp frontends, test suites, and SDK interactions (web3.js, Anchor client) are typically written in TypeScript.

Programming Fundamentals

JavaScript

The ubiquitous scripting language for web development, running in browsers and Node.js. JavaScript is dynamically typed and event-driven. Most Solana dApp frontends and scripts use JavaScript/TypeScript with libraries like @solana/web3.js. Node.js enables server-side JS for backend services, indexers, and bot development.

Programming Fundamentals

Node.js

A JavaScript runtime built on Chrome's V8 engine that enables server-side JavaScript execution. Node.js uses an event-driven, non-blocking I/O model. In the Solana ecosystem, Node.js is used for: running Anchor tests (Mocha/Jest), backend services, transaction bots, indexers, and CLI tools. npm/yarn/pnpm manage JavaScript package dependencies.