Flow REST API, RPC & gRPC (Access API)
Flow Overview
Flow is a Layer 1 blockchain built for consumer applications and digital assets. Flow supports two execution environments:
- Cadence: Flow's native smart contract language with resource-oriented programming for managing digital assets
- EVM (Flow EVM): Full EVM equivalence introduced with the Crescendo upgrade in September 2024, allowing Ethereum contracts to run on Flow without code changes
Flow uses FLOW as its native token for transaction fees, staking, and network governance.
Interacting with Flow APIs
Flow provides three API options for developers:
- Flow REST API: HTTP-based API for querying blockchain data and submitting transactions
- Flow gRPC (Access API): High-performance gRPC interface for accessing Flow network data
- Ethereum JSON-RPC API (Beta): EVM-compatible JSON-RPC endpoints for Ethereum tooling and smart contracts
The EVM compatibility means developers can use standard Ethereum tools like Hardhat, Foundry, Web3.js, and Ethers.js. Cadence developers can interact with EVM contracts, and EVM contracts can access Cadence functionality through the VM Bridge, enabling cross-environment composability.
The Quicknode Flow documentation is continuously evolving as the chain undergoes upgrades and changes, so we highly recommend cross-referencing with the official Flow documentation for the latest updates and features.
Make Flow API Calls
The quickest way to start building on Flow is to create a Quicknode endpoint and send your first API request.
Quicknode provides managed Flow endpoints, giving you immediate access to Flow Mainnet and Testnet without the overhead of running infrastructure. These endpoints offer:
- 高可靠性——全球佈局的基础設施，旨在將停機時間降至最低
- Enhanced performance – optimized latency and request handling for production applications
- 整合式生態系統——透過 Quicknode Marketplace 上的專用 API（附加元件）以及 Streams 等產品，提供額外功能
請造訪「快速入門」頁面，建立您的端點並發送第一個請求。
支援的網路
Quicknode provides access to the following Flow networks:
Complete reference for developers building on Flow with Quicknode:
快速入門
Get started with Flow quickly. Follow our step-by-step quickstart to set up your endpoint and make your first API request.
供應商端點
Learn how to configure and manage your Flow endpoints for optimal performance and reliability.
API 概覽
探索受支援的 API、網路、Quicknode 產品以及增強的 API 功能，以建置功能強大的應用程式。
市集
探索並整合來自 Quicknode 市集的強大外掛程式與工具，以強化您的 Web3 應用程式。
端點安全
透過身分驗證、白名單機制及最佳安全實務，確保您的端點安全。
錯誤代碼
Understand common error codes and troubleshooting steps for Flow API requests.