eth_getStorageAt - Optimism

GET https://opt-mainnet.unifra.io/v1/{your-api-key}

Returns the value from a storage position at a given address, or in other words, returns the state of the contract's storage, which may not be exposed via the contract's methods.

Parameters

• DATA, 20 Bytes - Address of the storage.
• QUANTITY - Integer of the position in the storage.
• QUANTITY|TAG - Integer block number, or the string "latest", "earliest" or "pending", see the default block parameter.

---

Returns

DATA - The value at this storage position.

---

Example

Calculating the correct position depends on the storage to retrieve. Consider the following contract deployed at 0x295a70b2de5e3953354a6a8344e616ed314d7251 by address 0x391694e7e0b0cce554cb130d723a9d27458f9298.

Solidity

contract Storage {
    uint pos0;
    mapping(address => uint) pos1;

    function Storage() {
        pos0 = 1234;
        pos1[msg.sender] = 5678;
    }
}

Retrieving the value of pos0 is straight forward:

Request

cURL

curl https://opt-mainnet.unifra.io/v1/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0", "method": "eth_getStorageAt", "params": ["0x295a70b2de5e3953354a6a8344e616ed314d7251", "0x0", "latest"], "id": 1}'

Postman

URL: https://opt-mainnet.unifra.io/v1/your-api-key
RequestType: POST
Body:
{
    "jsonrpc":"2.0",
    "method":"eth_getStorageAt",
    "params":["0x295a70b2de5e3953354a6a8344e616ed314d7251", "0x0", "latest"],
    "id":1
}

Result

JSON

{
	"jsonrpc": "2.0",
	"id": 1,
	"result": "0x0000000000000000000000000000000000000000000000000000000000000000"
}