system_accountNextIndex

Description

Return the next valid account nonce. Use to construct signed extrinsics and avoid “future proof” or “bad nonce” errors.

Returns the next valid transaction index (nonce) for an account.

Parameters

Parameter	Type	Required	Description
accountId	string	Yes	Hex-encoded AccountId (32 bytes typical); example uses ${S.accountId}

Code Examples

cURL

curl -X POST https://api-bittensor-mainnet.n.dwellir.com/YOUR_API_KEY \
+  -H 'Content-Type: application/json' \
+  -d '{"jsonrpc":"2.0","method":"system_accountNextIndex","params":["0x0000000000000000000000000000000000000000000000000000000000000000"],"id":1}'

Python

import requests, json

url = 'https://api-bittensor-mainnet.n.dwellir.com/YOUR_API_KEY'
headers = {'Content-Type': 'application/json'}
payload = {
  "jsonrpc": "2.0",
  "method": "system_accountNextIndex",
  "params": [
    "0x0000000000000000000000000000000000000000000000000000000000000000"
  ],
  "id": 1
}
res = requests.post(url, headers=headers, data=json.dumps(payload))
print(res.json()['result'])

JavaScript

const res = await fetch('https://api-bittensor-mainnet.n.dwellir.com/YOUR_API_KEY', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
  "jsonrpc": "2.0",
  "method": "system_accountNextIndex",
  "params": [
    "0x0000000000000000000000000000000000000000000000000000000000000000"
  ],
  "id": 1
})
});
const data = await res.json();
console.log(data.result);