JSON-RPC Endpoints

Horizen is fully EVM-compatible and supports the standard Ethereum JSON-RPC API. Use these endpoints to connect wallets, submit transactions, query state, and interact with deployed contracts.

Mainnet

Parameter	Value
Chain ID	26514
RPC (HTTPS)	https://horizen.calderachain.xyz/http
RPC (WebSocket)	wss://horizen.calderachain.xyz/ws
Currency Symbol	ETH
Block Explorer	https://explorer.horizen.io/
Bridge	https://hub.horizen.io/

Testnet (Base Sepolia)

Parameter	Value
Chain ID	2651420
RPC (HTTPS)	https://horizen-testnet.rpc.caldera.xyz/http
RPC (WebSocket)	wss://horizen-testnet.rpc.caldera.xyz/ws
Currency Symbol	ETH
Block Explorer	https://explorer-testnet.horizen.io/
Faucet	https://hub-testnet.horizen.io/

Supported JSON-RPC Methods

Horizen supports the full standard Ethereum JSON-RPC specification. The most commonly used methods are listed below.

Chain & Network

Method	Description
eth_chainId	Returns the current chain ID
net_version	Returns the network ID
eth_blockNumber	Returns the latest block number
eth_gasPrice	Returns the current gas price in wei

Accounts & Balances

Method	Description
eth_accounts	Returns a list of addresses owned by the client
eth_getBalance	Returns the ETH balance of an address
eth_getTransactionCount	Returns the nonce of an address

Blocks

Method	Description
eth_getBlockByHash	Returns block data by hash
eth_getBlockByNumber	Returns block data by block number
eth_getBlockTransactionCountByHash	Returns number of transactions in a block by hash
eth_getBlockTransactionCountByNumber	Returns number of transactions in a block by number

Transactions

Method	Description
eth_sendRawTransaction	Submits a signed transaction
eth_getTransactionByHash	Returns transaction data by hash
eth_getTransactionReceipt	Returns receipt for a mined transaction
eth_estimateGas	Estimates gas required for a transaction
eth_call	Executes a call without creating a transaction

Logs & Events

Method	Description
eth_getLogs	Returns logs matching a filter
eth_newFilter	Creates a new filter for log events
eth_getFilterLogs	Returns logs for an existing filter
eth_uninstallFilter	Removes a filter

Example for Querying Chain ID:

curl -X POST https://horizen.calderachain.xyz/http \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}'

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x6792"
}

0x6792 is 26514 in decimal — Horizen Mainnet's Chain ID.

Example for Querying ETH Balance:

curl -X POST https://horizen.calderachain.xyz/http \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getBalance",
    "params": ["0xYourAddress", "latest"],
    "id": 1
  }'

Example for WebSocket subscription (ethers.js):

import { ethers } from "ethers";

const provider = new ethers.WebSocketProvider(
  "wss://horizen.calderachain.xyz/ws"
);

provider.on("block", (blockNumber) => {
  console.log("New block:", blockNumber);
});