POST
https://starknet-mainnet.core.chainstack.com
/
365cf697a3ad6d950b4c4a911e2e4f4d
curl --request POST \
  --url https://starknet-mainnet.core.chainstack.com/365cf697a3ad6d950b4c4a911e2e4f4d \
  --header 'Content-Type: application/json' \
  --data '{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "starknet_getClassHashAt",
  "params": [
    {
      "block_number": 385940
    },
    "0x073314940630fd6dcda0d772d4c972c4e0a9946bef9dabf4ef84eda8ef542b82"
  ]
}'

Starknet OpenRPC spec

For the latest version of the publicly maintained OpenRPC spec, see the Starknet specs GitHub repo.

Starknet API method that returns the hash of the class at a given address.

It provides the hash of the class at the specified address. This can be useful for verifying the type of contract deployed at a given address.

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​
Parameters

  • address — the address of the contract.

  • block_id — the hash of the requested block, or number (height) of the requested block, or a block tag:

    • latest — the most recent block in the blockchain and the current state of the blockchain at the most recent block. A chain reorganization is to be expected.
    • safe — the block that received justification from the beacon chain. Although this block could be involved in a chain reorganization, it would necessitate either a coordinated attack by the majority of validators or an instance of severe propagation latency.
    • finalized — the block accepted as canonical by more than 2/3 of the validators. A chain reorganization is extremely unlikely, and it would require at least 1/3 of the staked ETH to be burned.
    • earliest — the earliest available or genesis block
    • pending — the pending state and transactions block. The current state of transactions that have been broadcast to the network but have not yet been included in a block.

​
Response

  • result — the hash of the class at the given address, represented as a hexadecimal string.

​
Use case

A practical use case for starknet_getClassHashAt is to verify the type of contract deployed at a given address. This can be useful for developers to ensure that the correct contract has been deployed at the expected address.

​
Deprecated feeder gateway method

The feeder gateway was deprecated on December 11, 2023.

Example of the call you had to make to the feeder gateway before the deprecation:

Shell
curl 'https://alpha-mainnet.starknet.io/feeder_gateway/get_class_hash_at?contractAddress=0x073314940630fd6dcda0d772d4c972c4e0a9946bef9dabf4ef84eda8ef542b82'

Body

application/json

Response

200

Successful response