eth_feeHistory on Unichain

Measured 2026-10-04 by our weekly probe, which calls eth_feeHistory through the same Unichain endpoint customers use.

What eth_feeHistory does

Returns base fees, gas-used ratios and optional priority-fee percentiles for a range of recent blocks. Wallets and SDKs use it to set maxFeePerGas and maxPriorityFeePerGas instead of guessing from eth_gasPrice.

eth_feeHistory on Unichain: what we measured

• With 1.0 s blocks, a 20-block window covers about 20 seconds of Unichain fee history.

Example request

curl -s https://rpc.swiftnodes.io/rpc/unichain?key=YOUR_API_KEY \
  -X POST -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_feeHistory","params":["0x14","latest",[25,50,75]]}'

import { createPublicClient, http } from "viem";

const client = createPublicClient({ transport: http("https://rpc.swiftnodes.io/rpc/unichain?key=YOUR_API_KEY") });

// Any JSON-RPC method, typed loosely: eth_feeHistory on Unichain
const result = await client.request({
  method: "eth_feeHistory",
  params: ["0x14","latest",[25,50,75]],
});

Other methods on Unichain

• eth_getLogsSupported
• eth_getBlockReceiptsSupported
• eth_getProofSupported
• eth_createAccessListSupported
• debug_traceCallSupported
• trace_blockSupported
• trace_transactionSupported

eth_feeHistory on other chains

Support differs by chain; the full measured table is on the eth_feeHistory reference.

• Ethereum
• Base
• Arbitrum
• Optimism
• Polygon
• BNB Smart Chain
• Avalanche
• Sonic
• Linea
• Scroll
• zkSync Era
• Blast
• Mantle
• Gnosis
• Celo
• Berachain
• Monad
• Kaia
• PulseChain

Frequently asked questions