EVM Chains

Beyond the Hedera relay, Hgraph serves standard Ethereum JSON-RPC across a growing set of EVM mainnets and testnets. Every chain follows the JSON-RPC 2.0 Specification and implements the Ethereum JSON-RPC APIs.

API Endpoints

All endpoints are served at https://<chain>.hgraph.com/rpc.

Network	Mainnet	Testnet
Ethereum	https://ethereum.hgraph.com/rpc	https://ethereum-sepolia.hgraph.com/rpc, https://ethereum-hoodi.hgraph.com/rpc
Optimism	https://optimism.hgraph.com/rpc	https://optimism-sepolia.hgraph.com/rpc
Base	https://base.hgraph.com/rpc	https://base-sepolia.hgraph.com/rpc
Arbitrum	https://arbitrum.hgraph.com/rpc	https://arbitrum-sepolia.hgraph.com/rpc
Avalanche	https://avalanche.hgraph.com/rpc	https://avalanche-fuji.hgraph.com/rpc
Polygon	https://polygon.hgraph.com/rpc	https://polygon-amoy.hgraph.com/rpc
Fraxtal	https://fraxtal.hgraph.com/rpc	—
Ink	https://ink.hgraph.com/rpc	—
Lisk	https://lisk.hgraph.com/rpc	—
Mode	https://mode.hgraph.com/rpc	—
Soneium	https://soneium.hgraph.com/rpc	—
Unichain	https://unichain.hgraph.com/rpc	—
Worldchain	https://worldchain.hgraph.com/rpc	—
Zora	https://zora.hgraph.com/rpc	—

Authentication

API requests require an API key. Create an account to obtain one — production keys start with pk_prod_.

Provide the key by any of:

• Header: X-API-KEY: <YOUR_API_KEY>
• Bearer: Authorization: Bearer <YOUR_API_KEY>
• Path: https://<chain>.hgraph.com/v1/<YOUR_API_KEY>/rpc

Example Request

curl -X POST \
-H "Content-Type: application/json" \
-H "X-API-KEY: <YOUR_API_KEY>" \
-d '{"jsonrpc":"2.0","id":"1","method":"eth_chainId","params":[]}' \
https://base.hgraph.com/rpc

Response — the hex result decodes to Base mainnet's chain ID, 8453:

{
  "result": "0x2105",
  "jsonrpc": "2.0",
  "id": "1"
}

Support

For any issues or questions, contact support.