Execution

qc_call

Executes a message call immediately without creating a transaction on the blockchain. Commonly used to read data from smart contracts.

Parameter	Type	Description
`txObject`	`object`	Transaction call object
`blockNumber`	`string`	Block number (hex) or tag

The transaction call object supports these fields:

Field	Type	Required	Description
`from`	`string`	No	Sender address
`to`	`string`	Yes	Contract address
`gas`	`string`	No	Gas limit (hex)
`gasPrice`	`string`	No	Gas price (hex)
`value`	`string`	No	Value in wei (hex)
`data`	`string`	No	ABI-encoded call data (hex)

curl -X POST https://api.quantumapi.io/v1/rpc \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "qc_call",
    "params": [{
      "to": "0x1234567890abcdef1234567890abcdef12345678",
      "data": "0x70a08231000000000000000000000000ff81e5c74e14db5b4ee407d66b1b063c8f305c51"
    }, "latest"],
    "id": 1
  }'

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x00000000000000000000000000000000000000000000000000000000000003e8"
}

The data field above is an ABI-encoded balanceOf(address) call. Use cast calldata or an ABI encoder to build these.

qc_createAccessList

Creates an EIP-2930 access list for a transaction. The access list identifies storage slots and addresses the transaction will access, which can reduce gas costs.

Parameter	Type	Description
`txObject`	`object`	Transaction call object
`blockNumber`	`string`	Block number (hex) or tag

curl -X POST https://api.quantumapi.io/v1/rpc \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "qc_createAccessList",
    "params": [{
      "from": "0xff81e5c74e14db5b4ee407d66b1b063c8f305c51",
      "to": "0x1234567890abcdef1234567890abcdef12345678",
      "data": "0x70a08231000000000000000000000000ff81e5c74e14db5b4ee407d66b1b063c8f305c51"
    }, "latest"],
    "id": 1
  }'

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "accessList": [
      {
        "address": "0x1234567890abcdef1234567890abcdef12345678",
        "storageKeys": [
          "0x0000000000000000000000000000000000000000000000000000000000000001"
        ]
      }
    ],
    "gasUsed": "0x5c68"
  }
}

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JSON-RPC reference

qc_call

qc_createAccessList

​qc_call

​qc_createAccessList

qc_call

qc_createAccessList