RPC method

eth_feeHistory on Mode

Supported on SwiftNodes

Measured 2026-10-11 by our weekly probe, which calls eth_feeHistory through the same Mode 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 Mode: what we measured

With 2.0 s blocks, a 20-block window covers about 40 seconds of Mode fee history.

Example request

curl -s https://rpc.swiftnodes.io/rpc/mode?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/mode?key=YOUR_API_KEY") });

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

Other methods on Mode

eth_feeHistory on other chains

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

Frequently asked questions

Does Mode support eth_feeHistory?

Yes. eth_feeHistory answered correctly on the SwiftNodes Mode endpoint in our weekly method probe (2026-10-11), which sends real requests through the customer path.

Are there limits on eth_feeHistory on Mode?

With 2.0 s blocks, a 20-block window covers about 40 seconds of Mode fee history.

Mode endpoints, live block height and WebSocket status are on the Mode RPC page.

One key covers every chain we serve, and SwiftNodes has a free tier.