POST
/
evm
eth_getStorageAt
curl --request POST \
  --url https://hyperliquid-mainnet.core.chainstack.com/4f8d8f4040bdacd1577bff8058438274/evm \
  --header 'Content-Type: application/json' \
  --data '{
  "jsonrpc": "2.0",
  "method": "eth_getStorageAt",
  "params": [
    "0x5555555555555555555555555555555555555555",
    "0x0",
    "latest"
  ],
  "id": 1
}'
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x000000000000000000000000fc1286eeddf81d6955edad5c8d99b8aa32f3d2aa"
}
The eth_getStorageAt JSON-RPC method returns the value stored at a specific storage position in a smart contract. This method provides direct access to contract storage, enabling contract state inspection, debugging, and advanced contract analysis.
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​
Parameters

The method takes three parameters:
  1. Address - The contract address to read storage from
  2. Storage position - The storage slot position to read
  3. Block parameter - The block at which to read the storage

​
Parameter details

  • address (string, required) — The 20-byte contract address
  • position (string, required) — The storage position as a hexadecimal string
  • block (string, required) — Block identifier: "latest" (only the latest block is supported on Hyperliquid)

​
Response

The method returns the 32-byte value stored at the specified position as a hexadecimal string.

​
Response structure

Storage value:
  • result — The 32-byte storage value as a hexadecimal string with 0x prefix

​
Data interpretation

Storage format:
  • Always returns 32 bytes (64 hex characters + 0x prefix)
  • Values are zero-padded to 32 bytes
  • 0x0000000000000000000000000000000000000000000000000000000000000000 indicates empty/zero storage
  • Actual data may be packed or encoded depending on variable type
Value decoding: 
// Decode different data types
const decodeUint256 = (hex) => parseInt(hex, 16);
const decodeAddress = (hex) => "0x" + hex.slice(-40); // Last 20 bytes
const decodeBool = (hex) => parseInt(hex, 16) !== 0;
const decodeBytes32 = (hex) => hex; // Already in correct format

​
Storage layout

​
Solidity storage rules

Basic types:
  • uint256, int256, bytes32 — Occupy full 32-byte slot
  • uint128, uint64, etc. — Packed into slots when possible
  • address — 20 bytes, often packed with other data
  • bool — 1 byte, packed with other data
Complex types:
  • Arrays — Length at base slot, elements at calculated positions
  • Mappings — Values at keccak256(key, slot) positions
  • Structs — Members packed sequentially starting from base slot

​
Storage slot calculation

Simple variables: 
contract Example {
    uint256 public value1;     // Slot 0
    address public owner;      // Slot 1 (packed with next if possible)
    bool public active;        // Slot 1 (packed with owner)
    uint256 public value2;     // Slot 2
}
Arrays: 
uint256[] public items;        // Length at slot 0
// items[i] at keccak256(0) + i
Mappings: 
mapping(address => uint256) public balances;  // Slot 0
// balances[addr] at keccak256(addr, 0)

​
Contract state inspection

​
Variable reading

Direct variable access:
  • Read public variables directly from their storage slots
  • Decode packed variables using appropriate offsets
  • Handle different data types and encodings
  • Verify variable values against expected ranges
State verification:
  • Compare storage values with expected contract state
  • Verify contract initialization and configuration
  • Check for state corruption or unexpected changes
  • Validate contract upgrade states

​
Current state analysis

State inspection:
  • Read current contract storage values
  • Analyze current contract state and configuration
  • Verify current variable values and settings
  • Inspect current contract initialization state

​
Usage example

​
Basic implementation

// Get storage value from a contract on Hyperliquid
const getStorageAt = async (contractAddress, position) => {
  const response = await fetch('https://hyperliquid-mainnet.core.chainstack.com/YOUR_ENDPOINT/evm', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      jsonrpc: '2.0',
      method: 'eth_getStorageAt',
      params: [contractAddress, position, 'latest'], // Only 'latest' is supported
      id: 1
    })
  });
  
  const data = await response.json();
  return data.result;
};

// Read different data types from storage
const analyzeContractStorage = async (contractAddress) => {
  // Read first few storage slots
  const slot0 = await getStorageAt(contractAddress, '0x0');
  const slot1 = await getStorageAt(contractAddress, '0x1');
  const slot2 = await getStorageAt(contractAddress, '0x2');
  
  return {
    slot0: {
      raw: slot0,
      asUint256: parseInt(slot0, 16),
      asAddress: "0x" + slot0.slice(-40), // Last 20 bytes
      asBool: parseInt(slot0, 16) !== 0
    },
    slot1: {
      raw: slot1,
      asUint256: parseInt(slot1, 16),
      asAddress: "0x" + slot1.slice(-40),
      asBool: parseInt(slot1, 16) !== 0
    },
    slot2: {
      raw: slot2,
      asUint256: parseInt(slot2, 16),
      asAddress: "0x" + slot2.slice(-40),
      asBool: parseInt(slot2, 16) !== 0
    }
  };
};

// Calculate mapping storage position
const getMappingValueSlot = (key, baseSlot) => {
  // This requires a library like ethers.js or web3.js for keccak256
  // Example: mapping(address => uint256) at slot 0
  const encodedKey = ethers.utils.defaultAbiCoder.encode(['address', 'uint256'], [key, baseSlot]);
  return ethers.utils.keccak256(encodedKey);
};

// Read mapping value
const readMappingValue = async (contractAddress, key, baseSlot) => {
  const slot = getMappingValueSlot(key, baseSlot);
  const value = await getStorageAt(contractAddress, slot);
  return parseInt(value, 16);
};

// Calculate array element position
const getArrayElementSlot = (baseSlot, index) => {
  // Array length is at baseSlot, elements start at keccak256(baseSlot)
  const arrayStartSlot = ethers.utils.keccak256(
    ethers.utils.defaultAbiCoder.encode(['uint256'], [baseSlot])
  );
  return (BigInt(arrayStartSlot) + BigInt(index)).toString(16);
};

// Usage examples
const contractAddress = "0x5555555555555555555555555555555555555555";

analyzeContractStorage(contractAddress)
  .then(analysis => console.log('Storage Analysis:', analysis))
  .catch(error => console.error('Error:', error));

// Read a specific storage slot
getStorageAt(contractAddress, '0x0')
  .then(value => console.log('Slot 0 value:', value))
  .catch(error => console.error('Error:', error));

​
Hyperliquid-specific considerations

​
Block limitations

Latest block only:
  • Only the "latest" block parameter is supported
  • Historical storage queries are not available in the default implementation
  • All storage reads are performed against the current state
  • For historical analysis, consider using archive node implementations

​
Storage analysis

Current state inspection:
  • Read contract storage values at current block
  • Analyze current contract configuration and state
  • Verify current variable values and settings
  • Debug current contract behavior and issues
Data interpretation:
  • Storage values are always 32 bytes (64 hex characters + “0x”)
  • Values are zero-padded to 32 bytes
  • Different data types require different decoding approaches
  • Packed variables share storage slots for gas efficiency

​
Example request

Shell
curl -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_getStorageAt","params":["0x5555555555555555555555555555555555555555","0x0","latest"],"id":1}' \
  https://hyperliquid-mainnet.core.chainstack.com/4f8d8f4040bdacd1577bff8058438274/evm

​
Use cases

The eth_getStorageAt method is essential for applications that need to:
  • Contract debugging: Inspect current contract state during development and testing
  • State verification: Verify current contract variables and configuration
  • Security analysis: Analyze current contract storage for security vulnerabilities
  • Contract auditing: Examine current contract state for audit and compliance
  • Development tools: Build contract inspection and debugging tools
  • Reverse engineering: Analyze unknown contracts by examining current storage
  • Testing frameworks: Verify current contract state in automated tests
  • Block explorers: Display current contract storage information
  • Integration services: Provide current contract state data to external systems
On Hyperliquid, eth_getStorageAt only supports the latest block. Storage positions are calculated based on Solidity’s storage layout rules. Complex types like arrays and mappings require specific calculations to determine the correct storage positions.

Body

application/json

Response

200 - application/json

Successful response with the storage value

The response is of type object.