Supported Chains

The Web3 Identity API supports multiple blockchain networks for various data types.

Primary Networks

Chain	Chain ID	ENS	Prices	DeFi	NFTs
Ethereum	1	✅	✅	✅	✅
Base	8453	✅	✅	✅	✅
Optimism	10	—	✅	✅	✅
Arbitrum	42161	—	✅	✅	✅

Chain Parameter

Most endpoints accept a chain parameter:

# Ethereum (default)
curl https://api.web3identity.com/api/gas

# Base
curl https://api.web3identity.com/api/gas?chain=base

# Arbitrum
curl https://api.web3identity.com/api/gas?chain=arbitrum

Valid Chain Values

Value	Network
ethereum or mainnet	Ethereum Mainnet
base	Base
optimism or op	Optimism
arbitrum or arb	Arbitrum One

Chain-Specific Endpoints

Gas Prices

# All chains at once
curl https://api.web3identity.com/api/gas/all

# Specific chain
curl https://api.web3identity.com/api/gas/base

DeFi Data

Most DeFi endpoints support chain filtering:

# TVL on Arbitrum only
curl https://api.web3identity.com/api/defi/tvl?chain=arbitrum

# Yields on Base
curl https://api.web3identity.com/api/yields?chain=base

Wallet Data

# Token balances on Base
curl https://api.web3identity.com/api/wallet/0x.../balances?chain=base

ENS Support

ENS resolution works across chains:

Feature	Ethereum	Base	L2s
Primary names	✅	✅ (via CCIP)	—
Reverse resolution	✅	✅	—
Text records	✅	✅	—
Contenthash	✅	✅	—

Note: ENS names resolve on Ethereum mainnet. L2 queries use CCIP-Read for cross-chain resolution.

Payment Network

x402 payments are processed on Base (Chain ID 8453) using USDC:

{
  "network": "base",
  "chainId": 8453,
  "asset": "USDC",
  "contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
}

Data Sources by Chain

Chain	Price Data	DeFi Data	NFT Data
Ethereum	CoinGecko, DefiLlama	DefiLlama, The Graph	Alchemy, OpenSea
Base	CoinGecko, DefiLlama	DefiLlama	Alchemy
Optimism	CoinGecko, DefiLlama	DefiLlama	Alchemy
Arbitrum	CoinGecko, DefiLlama	DefiLlama	Alchemy

Coming Soon

We're evaluating support for:

• Polygon (MATIC)
• Avalanche (AVAX)
• BNB Chain (BSC)

Request a chain →