curl --request POST \
  --url https://api.example.com/api/v1/transactions/estimate-gas \
  --header 'Content-Type: application/json' \
  --data '
{
  "chainId": 8453,
  "from": "0xabc1230000000000000000000000000000000000",
  "to": "0xdef4560000000000000000000000000000000000",
  "amount": "0.1"
}
'

{
  "code": 0,
  "msg": "ok",
  "data": {
    "chainId": 8453,
    "gasLimit": 21000,
    "gasPriceGwei": 1.2,
    "estimatedFeeNative": 0.0000252,
    "estimatedFeeUsd": 0.09,
    "confidence": "high",
    "updatedAt": "2026-05-11T10:00:00.000Z"
  }
}