eth_feeHistory

Returns fee history for a range of blocks on Optimism Layer 2.

Parameters

1. Block Count - QUANTITY
2. Newest Block - QUANTITY|TAG
3. Reward Percentiles - Array of percentile values

Implementation Examples

cURL

curl -X POST https://api-optimism-mainnet-archive.n.dwellir.com/YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_feeHistory",
    "params": ["0x4", "latest", [25, 50, 75]],
    "id": 1
  }'

JavaScript

// Get fee history for last 4 blocks on Optimism
const response = await fetch('https://api-optimism-mainnet-archive.n.dwellir.com/YOUR_API_KEY', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    jsonrpc: '2.0',
    method: 'eth_feeHistory',
    params: ["0x4", "latest", [25, 50, 75]],
    id: 1
  })
});

const data = await response.json();
console.log('Optimism L2 fee history:', data.result);

Response Example

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "oldestBlock": "0x75bcd11",
    "baseFeePerGas": ["0x3b9aca00", "0x3b9aca00"],
    "gasUsedRatio": [0.5, 0.6],
    "reward": [["0x3b9aca00", "0x5d21dba00", "0x746a528800"]]
  }
}

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Need help? Contact our support team or check the Optimism documentation.