{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_feeHistory",
  "params": ["0x5", "latest", [20, 70]]
}

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": {
    "oldestBlock": "0x1",
    "baseFeePerGas": [
      "0x3b9aca00",
      "0x3ba1f3e2",
      "0x3a6db1e6"
    ],
    "gasUsedRatio": [
      0.5265,
      0.4858,
      0.6124
    ],
    "reward": [
      [
        "0x3b9aca00",
        "0x3b9aca00"
      ],
      [
        "0x3ba1f3e2",
        "0x3b9aca00"
      ],
      [
        "0x3a6db1e6",
        "0x3b9aca00"
      ]
    ]
  }
}