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:
- High reliability – globally distributed infrastructure designed to minimize downtime
- Enhanced performance – optimized latency and request handling for production applications
- Integrated ecosystem – additional functionality through Quicknode add-ons and products like Streams
Visit the QuickStart page to create your endpoint and send your first request.
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 以及增強的 API 功能，以建構功能強大的應用程式。
附加元件
Discover endpoint add-ons that extend your Flow development workflow.
Endpoint
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.