curl https://site1.moralis-nodes.com/optimism/:apiKey \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc": "2.0", "method": "eth_feeHistory", "params": ["0x4", "latest", [25, 75]], "id": 1}'

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "baseFeePerGas": [
      "0x7",
      "0x7",
      "0x7",
      "0x7",
      "0x7"
    ],
    "gasUsedRatio": [
      0.026089875,
      0.406803,
      0.010817,
      0.5
    ],
	"baseFeePerBlobGas": [
		"0x3319eb",
		"0x350c54",
		"0x364072",
		"0x364072",
		"0x32279d"
	],
	"blobGasUsedRatio": [
		0.47619047619047616,
		0.2857142857142857,
		0,
		0.3333333333333333
	],
    "oldestBlock": "0x11b9231",
    "reward": [
      ["0x4a817c800", "0x4a817c800"],
      ["0x773593c0", "0x773593c0"],
      ["0x0", "0x0"],
      ["0x0", "0x0"]
    ]
  }
}