Base

Base is a secure, low-cost, developer-friendly Ethereum L2 built on the OP Stack by Coinbase.

Network Details

Property	Value
Chain ID	8453
CAIP-2	`eip155:8453`
Native Token	ETH
Block Time	~2 seconds
Finality	~15 minutes (L1 confirmation)
Stack	OP Stack (Optimistic Rollup)

Why Base?

Low fees: ~$0.001 per transaction
Fast: 2-second block times
Coinbase ecosystem: Direct fiat on/off ramps
EVM compatible: Deploy Ethereum contracts unchanged
Growing DeFi: Uniswap, Aave, and more

RPC Endpoints

Public RPCs

https://mainnet.base.org
https://base.llamarpc.com
https://base.publicnode.com

Provider RPCs (Recommended)

# Alchemy
https://base-mainnet.g.alchemy.com/v2/YOUR_KEY

# Infura
https://base-mainnet.infura.io/v3/YOUR_KEY

# QuickNode
https://YOUR_SUBDOMAIN.base-mainnet.quiknode.pro/YOUR_KEY/

Configuration

import { createPublicClient, http } from 'viem';
import { base } from 'viem/chains';

const client = createPublicClient({
  chain: base,
  transport: http(process.env.BASE_RPC_URL),
});

Common Contract Addresses

Tokens

Token	Address
WETH	`0x4200000000000000000000000000000000000006`
USDC	`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`
USDbC (Bridged)	`0xd9aAEc86B65D86f6A7B5B1b0c42FFA531710b6CA`
DAI	`0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb`
cbETH	`0x2Ae3F1Ec7F1F5012CFEab0185bfc7aa3cf0DEc22`

DeFi Protocols

Protocol	Contract
Uniswap V3 Router	`0x2626664c2603336E57B271c5C0b26F421741e481`
Aave V3 Pool	`0xA238Dd80C259a72e81d7e4664a9801593F98d1c5`
Compound V3 USDC	`0xb125E6687d4313864e53df431d5425969c15Eb2F`

Bridge & Infrastructure

Contract	Address
L1 Standard Bridge	`0x3154Cf16ccdb4C6d922629664174b904d80F2C35`
L2 Standard Bridge	`0x4200000000000000000000000000000000000010`
Multicall3	`0xcA11bde05977b3631167028862bE2a173976CA11`

Bridging

Official Bridge

Use the official Base Bridge for ETH and supported tokens:

import { baseBridge } from '@universal-crypto-mcp/core';

// Bridge ETH from Ethereum to Base
await baseBridge.deposit({
  amount: '0.1', // ETH
  recipient: '0xYourAddress',
});

// Bridge back to Ethereum (7-day withdrawal)
await baseBridge.withdraw({
  amount: '0.1',
  recipient: '0xYourAddress',
});

Third-Party Bridges

For faster withdrawals, use these bridges: - Hop Protocol: ~minutes - Across: ~minutes - Stargate: ~minutes

Gas Optimization

Base has very low gas costs. Typical transaction costs:

Operation	Gas	Cost (approx)
ETH Transfer	21,000	$0.001
ERC20 Transfer	65,000	$0.003
Uniswap Swap	150,000	$0.007
NFT Mint	100,000	$0.005

x402 on Base

Base is the recommended network for x402 payments due to low fees:

const routes = {
  'GET /api/data': {
    accepts: {
      scheme: 'exact',
      network: 'eip155:8453', // Base
      payTo: '0xYourAddress',
      price: '$0.01',
    },
  },
};

Block Explorers

BaseScan: basescan.org
Blockscout: base.blockscout.com

Testnet (Base Sepolia)

Property	Value
Chain ID	84532
CAIP-2	`eip155:84532`
RPC	`https://sepolia.base.org`
Faucet	faucet.quicknode.com/base/sepolia