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:
- 高い信頼性– ダウンタイムを最小限に抑えるよう設計された、世界中に分散したインフラストラクチャ
- Enhanced performance – optimized latency and request handling for production applications
- 統合エコシステム– Quicknode Marketplace上の専用API（アドオン）やStreamsなどの製品を通じて、追加機能を提供
「クイックスタート」ページにアクセスして、エンドポイントを作成し、最初のリクエストを送信してください。
対応ネットワーク
Quicknode provides access to the following Flow networks:
Complete reference for developers building on Flow with Quicknode:
クイックスタート
Get started with Flow quickly. Follow our step-by-step quickstart to set up your endpoint and make your first API request.
プロバイダーのエンドポイント
Learn how to configure and manage your Flow endpoints for optimal performance and reliability.
APIの概要
強力なアプリケーションを構築するために、サポートされているAPI、ネットワーク、Quicknode製品、および強化されたAPI機能についてご覧ください。
マーケットプレイス
Quicknode Marketplaceの強力なアドオンやツールを見つけて導入し、Web3アプリケーションを強化しましょう。
エンドポイントセキュリティ
認証、ホワイトリスト、およびセキュリティのベストプラクティスを活用して、エンドポイントを保護しましょう。
エラーコード
Understand common error codes and troubleshooting steps for Flow API requests.