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4 arquivos name viem description Use viem for Celo development. Includes fee currency support, transaction signing, and Celo-specific configurations. license Apache-2.0 metadata {"author":"celo-org","version":"1.0.0"}
Viem for Celo
Viem is a lightweight TypeScript library with first-class Celo support. It powers wagmi and RainbowKit.
Source: https://viem.sh/docs/chains/celo
When to Use
Building dApps that interact with Celo
Sending transactions with alternative fee currencies
Reading contract state and blockchain data
Signing messages and transactions
Installation
npm install viem
Chain Configuration
Source: https://github.com/wevm/viem (chain definitions)
Mainnet
import { celo } from "viem/chains" ;
Testnet (Celo Sepolia)
import { celoSepolia } from
"viem/chains"
Custom Chain with Celo Config import { defineChain } from "viem" ;
import { chainConfig } from "viem/celo" ;
export const customCeloChain = defineChain ({
...chainConfig,
id : 42220 ,
name : "Custom Celo" ,
});
Client Setup
Public Client (Read Operations) import { createPublicClient, http } from "viem" ;
import { celo } from "viem/chains" ;
const publicClient = createPublicClient ({
chain : celo,
transport : http (),
});
const balance = await publicClient.getBalance ({
address : "0x..." ,
});
Wallet Client (Write Operations) import { createWalletClient, custom } from "viem" ;
import { celo } from "viem/chains" ;
const walletClient = createWalletClient ({
chain : celo,
transport : custom (window .ethereum ),
});
const [address] = await walletClient.getAddresses ();
Fee Currency Support Celo allows paying gas fees in tokens other than CELO. Use whitelisted fee currency adapters.
Fee Currency Addresses - Mainnet Token Adapter Address USDC 0x2F25deB3848C207fc8E0c34035B3Ba7fC157602B USDT 0x0e2a3e05bc9a16f5292a6170456a710cb89c6f72
Fee Currency Addresses - Celo Sepolia Token Adapter Address USDC 0x4822e58de6f5e485eF90df51C41CE01721331dC0
Serialize Transaction with Fee Currency import { serializeTransaction } from "viem/celo" ;
import { parseGwei, parseEther } from "viem" ;
const serialized = serializeTransaction ({
chainId : 42220 ,
gas : 21001n ,
feeCurrency : "0x2F25deB3848C207fc8E0c34035B3Ba7fC157602B" ,
maxFeePerGas : parseGwei ("20" ),
maxPriorityFeePerGas : parseGwei ("2" ),
nonce : 69 ,
to : "0x1234512345123451234512345123451234512345" ,
value : parseEther ("0.01" ),
});
Send Transaction with Fee Currency import { createWalletClient, custom, parseEther } from "viem" ;
import { celo } from "viem/chains" ;
const USDC_ADAPTER = "0x2F25deB3848C207fc8E0c34035B3Ba7fC157602B" ;
const walletClient = createWalletClient ({
chain : celo,
transport : custom (window .ethereum ),
});
const [address] = await walletClient.getAddresses ();
const hash = await walletClient.sendTransaction ({
account : address,
to : "0x..." ,
value : parseEther ("1" ),
feeCurrency : USDC_ADAPTER ,
});
Contract Call with Fee Currency const hash = await walletClient.writeContract ({
address : CONTRACT_ADDRESS ,
abi : CONTRACT_ABI ,
functionName : "transfer" ,
args : [recipient, amount],
feeCurrency : USDC_ADAPTER ,
});
Celo Utilities
Parse Transaction import { parseTransaction } from "viem/celo" ;
const transaction = parseTransaction ("0x7cf846..." );
Serialize Transaction import { serializeTransaction } from "viem/celo" ;
const serialized = serializeTransaction ({
chainId : 42220 ,
feeCurrency : "0x2F25deB3848C207fc8E0c34035B3Ba7fC157602B" ,
});
Reading Contract Data import { createPublicClient, http } from "viem" ;
import { celo } from "viem/chains" ;
const publicClient = createPublicClient ({
chain : celo,
transport : http (),
});
const ERC20 _ABI = [
{
name : "balanceOf" ,
type : "function" ,
stateMutability : "view" ,
inputs : [{ name : "account" , type : "address" }],
outputs : [{ type : "uint256" }],
},
] as const ;
const balance = await publicClient.readContract ({
address : "0x765de816845861e75a25fca122bb6898b8b1282a" ,
abi : ERC20 _ABI,
functionName : "balanceOf" ,
args : ["0x..." ],
});
Multicall Batch multiple read calls efficiently:
const results = await publicClient.multicall ({
contracts : [
{
address : TOKEN_ADDRESS ,
abi : ERC20 _ABI,
functionName : "balanceOf" ,
args : [userAddress],
},
{
address : TOKEN_ADDRESS ,
abi : ERC20 _ABI,
functionName : "totalSupply" ,
},
],
});
Important Notes
Viem is the recommended library for Celo (ethers.js and web3.js don't support feeCurrency)
Fee currency transactions use type 0x7b (CIP-64)
Transactions with fee currencies incur ~50,000 additional gas
Omitting feeCurrency defaults to paying in CELO
Use viem/celo for Celo-specific utilities (parseTransaction, serializeTransaction)
Dependencies {
"dependencies" : {
"viem" : "^2.0.0"
}
}
Additional Resources 