post https://base-mainnet.unifra.io/v1/
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
Request
curl --request POST \
--url https://base-testnet.unifra.io/v1/{your-api-key} \
--header 'accept: application/json' \
--header 'content-type: application/json' \
--data '
{
"jsonrpc": "2.0",
"method": "eth_getStorageAt",
"params": [
"0x9c482da80bcb146d588ae0f13650b2e84d5f709e",
"0x0",
"latest"
],
"id": 1
}
'
Result
{
"jsonrpc": "2.0",
"id": 1,
"result": "0x0000000000000000000000002547aaa4e6a4e67131b5b58dc08b1bedc5bcf642"
}
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://base-testnet.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"
}
Responses