RPC Calls

There are two types of RPCs available:
​ETH compatible RPCs, where interface and functionalities match the JSON-RPC spec​
​Custom RPCs, which are EVM+ specific RPCs that don't exist in traditional EVM world.
ETH compatible RPCs
web3_clientVersion
net_version
eth_blockNumber
eth_chainId
eth_getTransactionCount
eth_getCode
eth_call
eth_getBalance
eth_getBlockByHash
eth_getBlockByNumber
eth_gasPrice
eth_accounts
eth_getStorageAt
eth_getBlockTransactionCountByHash
eth_getBlockTransactionCountByNumber
eth_sendRawTransaction
eth_estimateGas
eth_getTransactionByHash
eth_getTransactionReceipt
eth_getTransactionByBlockHashAndIndex
eth_getTransactionByBlockNumberAndIndex
eth_getUncleCountByBlockHash
eth_getUncleCountByBlockNumber
eth_getUncleByBlockHashAndIndex
eth_getUncleByBlockNumberAndIndex
eth_getLogs
eth_subscribe
eth_unsubscribe
eth_newFilter
eth_newBlockFilter
eth_getFilterLogs (doesn't support unfinalized logs yet)
eth_getFilterChanges (doesn't support unfinalized logs yet)
eth_uninstallFilter
Custom RPCs
eth_getEthGas: calculate eth transaction gas params from substrate gas params. More details please refer here​
eth_getEthResources: calculate eth transaction gas params from transaction details, params: TransactionRequest​
net_indexer: get subql indexer metadata
net_cacheInfo: get the cache info
net_isSafeMode: check if this RPC is running in safe mode
net_health: check the health of the RPC endpoint
net_runtimeVersion: check the current runtime version of the underlying polkadot.js api
eth_isBlockFinalized: check if a block is finalized, params: BlockTag​
eth_isTransactionFinalized: check if a transaction is finalized, note that it also returns false for non-exist tx, params: string
Example of use
This is an example on how to use the eth_getEthGas call in order to get the gas parameters for the transaction.
So for Truffle, to get the right gas price and limit. Let's ask the RPC:
curl https://eth-rpc-mandala.aca-staging.network \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_getEthGas","params": [], "id": 1}'
You should get this for an answer:
{
  "id": 1,
  "jsonrpc": "2.0",
  "result": {
    "gasPrice": "0x2f955803e9",
    "gasLimit": "0x3293440"
  }
}
So in your truffle-config.js you can adjust the gas parameters with the values returned:
mandala: {
    provider: () => new HDWalletProvider(mnemonic, "https://eth-rpc-mandala.aca-staging.network"),
    network_id: 595,
    gasPrice: 0x2f955803e9,
    gas: 0x3293440
}, 
For more details about the gas params, please refer to the gas params section.
We can also send the RPC call with Postman, so that we can save the calls and reuse them later.
Last modified 3mo ago