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

Request

curl --location 'https://linea-mainnet.unifra.io/v1/{your-api-key}' \
--header 'Content-Type: application/json' \
--data '{
    "jsonrpc": "2.0",
    "method": "eth_getStorageAt",
    "params": [
        "0xa658742d33ebd2ce2f0bdff73515aa797fd161d9",
        "0x0",
        "latest"
    ],
    "id": 1
}'

Result

{
    "jsonrpc": "2.0",
    "id": 1,
    "result": "0x0000000000000000000000000000000000000000000000000000000000000001"
}

Retrieving an element of the map is harder. The position of an element in the map is calculated with:

keccack(LeftPad32(key, 0), LeftPad32(map position, 0))

This means to retrieve the storage on pos1[“0x391694e7e0b0cce554cb130d723a9d27458f9298”] we need to calculate the position with:

keccak(
	decodeHex(
		"000000000000000000000000391694e7e0b0cce554cb130d723a9d27458f9298" +
			"0000000000000000000000000000000000000000000000000000000000000001"
	)
);

The geth console which comes with the web3 library can be used to make the calculation:

> var key = "000000000000000000000000391694e7e0b0cce554cb130d723a9d27458f9298" + "0000000000000000000000000000000000000000000000000000000000000001"
undefined
> web3.sha3(key, {"encoding": "hex"})
"0x6661e9d6d8b923d5bbaab1b96e1dd51ff6ea2a93520fdc9eb75d059238b8c5e9"

Now to fetch the storage:

Request

curl https://linea-mainnet.unifra.io/v1/{your-api-key} \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0", "method": "eth_getStorageAt", "params": ["0x295a70b2de5e3953354a6a8344e616ed314d7251", "0x6661e9d6d8b923d5bbaab1b96e1dd51ff6ea2a93520fdc9eb75d059238b8c5e9", "latest"], "id": 1}'

Result

{
	"jsonrpc": "2.0",
	"id": 1,
	"result": "0x000000000000000000000000000000000000000000000000000000000000162e"
}