Top Sites>Celo: Ethereum Layer 2 for Payments, Stablecoins & DeFi

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# Celo
> Celo is the Ethereum Layer 2 built for the real world, designed for fast, low-cost transactions worldwide.
This documentation provides comprehensive guides, references, and tutorials for developers building on Celo
## AI Agent Resources
- [SKILL.md](https://celo.org/SKILL.md): Comprehensive guide for AI agents to understand and build on Celo
- [Full Documentation](https://celo.org/llms-full.txt): Complete inline documentation with code examples and API reference
## Core Concepts
- [Network Information](https://docs.celo.org/build-on-celo/network-overview): Overview of Celo Mainnet and Celo Sepolia, including RPCs, explorers, and bridge links
- [L2 Architecture](https://docs.celo.org/build-on-celo/cel2-architecture): How Celo works as an Ethereum Layer 2 built on the OP Stack
- [Transactions](https://docs.celo.org/home/protocol/transactions/overview): Transaction types and Celo specific fields like feeCurrency
- [Fee Abstraction](https://docs.celo.org/tooling/overview/fee-abstraction): Pay gas with approved ERC20s by setting feeCurrency
- [Forno](https://docs.celo.org/tooling/nodes/forno): Public HTTP and WebSocket endpoints for querying Celo and broadcasting transactions
- [Bridging](https://docs.celo.org/home/bridged-tokens/bridges): Bridge assets between Celo and other networks, including native L1 to L2 routes
## Getting Started
- [Celo Docs](https://docs.celo.org/): Entry point for building, tooling, and ecosystem resources
- [Build on Celo](https://docs.celo.org/build-on-celo): High level overview of building on Celo as an Ethereum L2
- [Quickstart](https://docs.celo.org/build-on-celo/quickstart): Scaffold a new project using Celo Composer
- [Celo Sepolia](https://docs.celo.org/tooling/testnets/celo-sepolia): Testnet details and developer setup
- [Add Celo Testnet to Metamask](https://docs.celo.org/tooling/wallets/metamask/add-celo-testnet-to-metamask): Configure MetaMask for Celo Sepolia
## Tokens
- [Build with Local Stablecoins](https://docs.celo.org/build-on-celo/build-with-local-stablecoin): Overview of Mento stablecoins and local currency assets on Celo
- [Token Contracts](https://docs.celo.org/tooling/contracts/token-contracts): Token addresses for key Celo assets on Mainnet and Celo Sepolia
- [Bridging](https://docs.celo.org/home/bridged-tokens/bridges): Move tokens across chains and understand bridged asset options
## Frontend
- [@Celo/Composer Kit UI](https://docs.celo.org/tooling/libraries-sdks/composer-kit): React component library for wallet connections, balances, payments, and common dApp flows
- [@Celo/Celo Libraries & SDKS](https://docs.celo.org/tooling/libraries-sdks/celo-sdks): Recommended client libraries and wallet tooling for Celo apps
- [Build with Portal](https://docs.celo.org/tooling/libraries-sdks/portal): Embedded wallet flows and SDK guidance for Celo
## Client SDKs
- [Contract Kit](https://docs.celo.org/tooling/libraries-sdks/contractkit/usage): JavaScript SDK for interacting with Celo core contracts and custom contracts
- [Celo CLI](https://docs.celo.org/tooling/libraries-sdks/cli): Command line tooling for accounts, governance, validators, and protocol utilities
- [Using thirdweb](https://docs.celo.org/tooling/dev-environments/thirdweb/thirdweb): Build and deploy contracts and apps using thirdweb on Celo
## References
- [Nodes and Services](https://docs.celo.org/tooling/nodes/overview): Node options including Forno and hosted RPC providers
- [Explorer Overview](https://docs.celo.org/tooling/explorers/overview): Explore transactions, contracts, and ecosystem activity
- [Block Explores](https://docs.celo.org/tooling/explorers/block-explorers): Celo explorers like Blockscout and Celoscan
- [Data Indexers](https://docs.celo.org/tooling/indexers/overview): Indexing and data providers for historical and real time onchain data
- [Oracles](https://docs.celo.org/tooling/oracles): Oracle providers available on Celo
## RPC API
- [Forno RPC](https://docs.celo.org/tooling/nodes/forno): Public RPC endpoints (HTTP and WebSocket)
- [Transactions](https://docs.celo.org/home/protocol/transactions/overview): Transaction fields, types, and Celo specific behavior
- [Fee Abstraction](https://docs.celo.org/tooling/overview/fee-abstraction): How wallets and clients set feeCurrency for stablecoin gas
## Payments
- [Build for MiniPay](https://docs.celo.org/build-on-celo/build-on-minipay/quickstart): Build and test MiniPay Mini Apps end to end
- [Build with Local Stablecoins](https://docs.celo.org/build-on-celo/build-with-local-stablecoin): Stablecoin rails for payments, remittances, and FX
- [Fee Abstraction](https://docs.celo.org/tooling/overview/fee-abstraction): How wallets and clients set feeCurrency for stablecoin gas
## Learn
- [What is Celo](https://docs.celo.org/home): Overview of Celo, key concepts, and how the network works
- [What is an Ethereum L2](https://docs.celo.org/build-on-celo/cel2-architecture): Understand the Celo stack and its relationship to Ethereum
## Cookbook
- [Deploy on Celo with Hardhat](https://docs.celo.org/tooling/dev-environments/hardhat): Compile, deploy, and verify contracts using Hardhat
- [Deploy on Celo with Foundry](https://docs.celo.org/tooling/dev-environments/foundry): Deploy and interact with contracts using Foundry
- [Bridging](https://docs.celo.org/tooling/bridges/bridges): Practical guidance on bridges and cross-chain workflows
- [Data Indexers](https://docs.celo.org/tooling/indexers/overview): Add subgraphs or indexers for app data needs
## Guides
- [Build with AI on Celo](https://docs.celo.org/build-on-celo/build-with-ai/overview): Overview of agentic activity, tools, and use cases on Celo
- [ERC-8004: Agent Trust Protocol](https://docs.celo.org/build-on-celo/build-with-ai/8004): Trust registries for agent identity, reputation, and validation
- [x402: Agent Payments](https://docs.celo.org/build-on-celo/build-with-ai/x402): Trust registries for agent identity, reputation, and validation
- [Agent Skills](https://docs.celo.org/build-on-celo/build-with-ai/agent-skills): Modular capabilities for building and shipping AI agents on Celo
- [Build with DeFi](https://docs.celo.org/build-on-celo/build-with-defi): Tooling and infrastructure for building DeFi apps on Celo