state_getKeys - JSON-RPC Method

Description

Returns a list of storage keys that share a given prefix. This method is helpful when you need to discover child keys beneath a map, such as iterating through all system accounts or fuel tank records in Enjin Matrix.

Parameters

Parameter	Type	Required	Description
prefix	string	Yes	Hex-encoded storage prefix (typically twox128(module) + hasher(storage))
blockHash	string | null	No	Block hash for historical queries; null uses the best block

Returns

An array of hex-encoded storage keys matching the supplied prefix.

Request Example

{
  "jsonrpc": "2.0",
  "method": "state_getKeys",
  "params": [
    "0x26aa394eea5630e07c48ae0c9558cef7",
    null
  ],
  "id": 1
}

Response Example (truncated)

{
  "jsonrpc": "2.0",
  "result": [
    "0x26aa394eea5630e07c48ae0c9558cef702a5c1b19ab7a04f536c519aca4983ac",
    "0x26aa394eea5630e07c48ae0c9558cef70a98fdbe9ce6c55837576c60c7af3850",
    "0x26aa394eea5630e07c48ae0c9558cef734abf5cb34d6244378cddbf18e849d96",
    "…"
  ],
  "id": 1
}

Code Examples

cURL

curl https://api-enjin-matrixchain.n.dwellir.com/YOUR_API_KEY \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "state_getKeys",
    "params": ["0x26aa394eea5630e07c48ae0c9558cef7", null],
    "id": 1
  }'

Python

import json
import requests

prefix = "0x26aa394eea5630e07c48ae0c9558cef7"  # twox128("System")

response = requests.post(
    "https://api-enjin-matrixchain.n.dwellir.com/YOUR_API_KEY",
    headers={"Content-Type": "application/json"},
    data=json.dumps({
        "jsonrpc": "2.0",
        "method": "state_getKeys",
        "params": [prefix, None],
        "id": 1,
    }),
    timeout=10,
)

keys = response.json()["result"]
print(f"Returned {len(keys)} keys")

JavaScript

const prefix = '0x26aa394eea5630e07c48ae0c9558cef7'; // Module: System
const body = {
  jsonrpc: '2.0',
  method: 'state_getKeys',
  params: [prefix, null],
  id: 1
};

const keys = await fetch('https://api-enjin-matrixchain.n.dwellir.com/YOUR_API_KEY', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify(body)
}).then((r) => r.json());

console.log(keys.result.length);

Tips

• Use state_getKeysPaged for large datasets; it adds pagination controls to avoid heavy responses.
• Combine with state_getStorage to fetch the associated values for each discovered key.
• Remember that map storage keys append hashes and encoded keys (e.g., Blake2_128Concat(AccountId)), so you may need to post-process the suffix.