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state_getStorageAt - JSON-RPC Method

Description​

Returns the SCALE-encoded value under a storage key at the given block hash. Use this for historical queries and deterministic reads.

Parameters​

ParameterTypeRequiredDescription
keystringYesHex-encoded storage key
atstringYesBlock hash to query at

Returns​

Hex-encoded SCALE value, or null if the key does not exist.

Request Example​

Query the :code key (runtime Wasm) at a finalized block:

curl -s https://api-moonriver.n.dwellir.com/YOUR_API_KEY \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc":"2.0",
    "id":1,
    "method":"state_getStorageAt",
    "params":["0x3a636f6465", "0x1849c7bc2c547b315fef716c6f2fb6f5e256da60482a013286caf975d035f766"]
  }'

Tip: Replace the block hash with the current finalized head from chain_getFinalizedHead.