contract-addresses

name: contract-addresses description: Verified contract addresses for major EVM protocols across Ethereum, Arbitrum, Optimism, Base, and Polygon. Covers tokens, DEXes, lending, bridges, and infrastructure. Use as a reference when building integrations — every address is checksummed and should be verified onchain before use in production. license: Apache-2.0 metadata: author: cryptoskills version: "1.0" chain: multichain category: Infrastructure tags: - addresses - contracts - tokens - reference

Contract Addresses

Canonical contract addresses for major EVM protocols. Reference skill for agents building integrations across Ethereum, Arbitrum, Optimism, Base, and Polygon.

Last verified: February 2026 — All addresses verified onchain via cast code. Always re-verify before mainnet use.

What You Probably Got Wrong

• Addresses differ across chains — USDC on Arbitrum is NOT the same address as USDC on Ethereum. Never assume cross-chain address parity except for contracts deployed via CREATE2 at deterministic addresses.
• Bridged vs. native tokens — Many chains have both a bridged USDC (USDC.e) and a native USDC. Using the wrong one causes failed swaps and lost funds. This reference lists the canonical native version where available.
• Checksums matter — EIP-55 mixed-case checksums prevent sending to mistyped addresses. Always use checksummed addresses.
• Proxy vs. implementation — Most protocol addresses listed here are proxies. The implementation behind them can change via governance. Verify the proxy's current implementation if you need the ABI.
• Uniswap has multiple routers — SwapRouter (V3-only), SwapRouter02 (V2+V3), and Universal Router (V2+V3+NFTs) are different contracts. Most integrations should use Universal Router.

Stablecoins

USDC (Circle)

USDC.e (Bridged USDC)

USDT (Tether)

DAI (MakerDAO)

Wrapped Tokens

WETH (Wrapped Ether)

wstETH (Lido Wrapped Staked ETH)

DEX Routers

Uniswap

Uniswap V2 (Ethereum only)

Lending

Aave V3

Compound V3 (Comet)

Oracles

Chainlink Price Feeds

Chainlink Infrastructure

Infrastructure

Multicall

CREATE2 Deployers

ENS (Ethereum Only)

Safe (Gnosis Safe)

Permit2 (Uniswap)

Bridges

Arbitrum Native Bridge

Optimism Native Bridge

Base Native Bridge

Governance

Major Protocol Governance

Governance Tokens

OP Stack Predeploys

Shared across Optimism, Base, and all OP Stack chains at the same addresses.

How to Verify

Always verify addresses onchain before using them in production. Addresses in this reference may become outdated if protocols upgrade their proxies.

Using cast (Foundry)

Check if code exists at an address:

cast code 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 --rpc-url $ETH_RPC_URL

A non-empty response confirms a contract exists. 0x means no contract (EOA or empty).

Verify a token's identity:

cast call 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 "symbol()(string)" --rpc-url $ETH_RPC_URL
cast call 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 "decimals()(uint8)" --rpc-url $ETH_RPC_URL

Check a proxy's implementation:

# EIP-1967 implementation slot
cast storage 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 \
  0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc \
  --rpc-url $ETH_RPC_URL

Using Etherscan API

# Verify contract is verified on Etherscan
curl "https://api.etherscan.io/api?module=contract&action=getabi&address=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48&apikey=$ETHERSCAN_API_KEY"

Chain-specific explorers:

• Ethereum: api.etherscan.io
• Arbitrum: api.arbiscan.io
• Optimism: api-optimistic.etherscan.io
• Base: api.basescan.org
• Polygon: api.polygonscan.com

Checksum Verification

Verify an address is correctly checksummed:

cast to-check-sum-address 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48

Important Caveats

• Proxy upgrades -- Protocol governance can upgrade proxy implementations. The proxy address stays the same, but behavior may change. Monitor governance proposals for protocols you depend on.
• Chain-specific behavior -- Same protocol may behave differently across chains. Aave V3 on Ethereum has different parameters (LTV, liquidation thresholds) than on Arbitrum.
• Deprecated contracts -- USDC.e (bridged) is being phased out in favor of native USDC on L2s. Old router addresses may still work but lack new features.
• Token decimals -- USDC/USDT use 6 decimals. DAI/WETH use 18. Never assume 18 decimals.
• USDT non-standard -- USDT's transfer() and approve() do not return a boolean. Use OpenZeppelin's SafeERC20 or viem's built-in handling.

References

• Circle USDC Addresses
• Uniswap Deployments
• Aave V3 Deployed Contracts
• Compound V3 Deployments
• Chainlink Feed Registry
• Safe Deployments
• OP Stack Predeploys
• Arbitrum Bridge Contracts
• ENS Deployments
• Multicall3