Supported Chains

HelloTrade runs on Monad. Each network maps to a deployment environment: mainnet → production, testnet → staging. Use the parameters, endpoints, and EIP-712 domains for the network you are targeting.

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Mainnet (Monad)

Production environment.

Network Parameters

Parameter	Value
Chain ID	143
Vault contract	0xe52B14240514E7A05DddA336cFF0D99ce8bB7230
Collateral token	0x754704bc059f8c67012fed69bc8a327a5aafb603

Endpoints

Service	Endpoint	Authentication
REST API	https://api.app.hello.trade/api	EIP-712
WebSocket Trading	wss://api.app.hello.trade/ws	EIP-191/EIP-712
WebSocket Market Data	wss://marketdata.app.hello.trade/ws	Public token
Public Chain RPC	https://rpc.monad.xyz	None

EIP-712 Domains

Vault Domain (Orders, Withdrawals, Leverage, Cancels):

{
  "name": "HelloVault",
  "version": "1",
  "chainId": 143,
  "verifyingContract": "0xe52B14240514E7A05DddA336cFF0D99ce8bB7230"
}

Token Domain (Deposits via ERC-2612):

{
  "name": "USDC",
  "version": "2",
  "chainId": 143,
  "verifyingContract": "0x754704bc059f8c67012fed69bc8a327a5aafb603"
}

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Testnet (Monad)

Staging environment.

Network Parameters

Parameter	Value
Chain ID	10143
Vault contract	0xfA6fcb77ACA7F941861F8Ee0Fb40662A5B28B77b
Collateral token	0xd1eC521d1A49A1590b6ed06ed7d96dabA24E28C1

Endpoints

Service	Endpoint	Authentication
REST API	https://api.staging.hello.trade/api	EIP-712
WebSocket Trading	wss://api.staging.hello.trade/ws	EIP-191/EIP-712
WebSocket Market Data	wss://marketdata.staging.hello.trade/ws	Public token
Public Chain RPC	https://rpc-testnet.monad.xyz	None

EIP-712 Domains

Vault Domain (Orders, Withdrawals, Leverage, Cancels):

{
  "name": "HelloVault",
  "version": "1",
  "chainId": 10143,
  "verifyingContract": "0xfA6fcb77ACA7F941861F8Ee0Fb40662A5B28B77b"
}

Token Domain (Deposits via ERC-2612):

{
  "name": "UsdcMock",
  "version": "1",
  "chainId": 10143,
  "verifyingContract": "0xd1eC521d1A49A1590b6ed06ed7d96dabA24E28C1"
}

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Verifying the On-Chain EIP-712 Domain

Both Vault contracts implement EIP-5267 and expose an eip712Domain() view function that returns the canonical domain fields (name, version, chainId, verifyingContract, …) straight from the deployment. Use it to confirm the values above against the live contract.

Query it through the public chain RPC with a single eth_call (the eip712Domain() selector is 0x84b0196e):

curl -s https://rpc.monad.xyz \
  -X POST -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "eth_call",
    "params": [
      { "to": "0xe52B14240514E7A05DddA336cFF0D99ce8bB7230", "data": "0x84b0196e" },
      "latest"
    ]
  }'

The ABI-encoded result decodes to (bytes1 fields, string name, string version, uint256 chainId, address verifyingContract, bytes32 salt, uint256[] extensions). For testnet, send the same call to https://rpc-testnet.monad.xyz with the testnet vault address (0xfA6fcb77ACA7F941861F8Ee0Fb40662A5B28B77b).

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See Signatures for signature construction details.