RPC method

eth_estimateGas on Morph

Supported on SwiftNodes

Everything below was measured on 2026-10-13 by calling eth_estimateGas on Morph through the same endpoint customers use, and is re-measured weekly.

What eth_estimateGas does

Runs a transaction against current state and returns the gas it would use, so you can set a gas limit. If the transaction would revert or the sender cannot pay, the node returns an error instead of a number.

eth_estimateGas on Morph: what we measured

Zero-value ETH transfer to an EOA	21,000 gas
Same on Ethereum	21,000 gas
1 wei from an empty account	err: insufficient funds for gas * price + value: address 0x040e52683C4d45c2aeFbb284ff135513811d1931 have 0 want 1 (supplied gas 45000000)

What the numbers mean

A plain transfer estimates at exactly 21,000 gas on Morph, as on Ethereum. Contract calls vary with state, so estimate those rather than hard-coding a limit.

An estimate for a sender that cannot pay fails with: "err: insufficient funds for gas * price + value: address 0x040e52683C4d45c2aeFbb284ff135513811d1931 have 0 want 1 (supplied gas 45000000)". Your app sees this text when a user's balance is too low, so match on it to show a clear message.

Chains where a transfer is not 21,000 gas

Of the 53 chains we measure, 6 estimate a plain transfer at something other than 21,000 gas.

Example request

curl -s https://rpc.swiftnodes.io/rpc/morph?key=YOUR_API_KEY \
  -X POST -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_estimateGas","params":[{"from":"0x0000000000000000000000000000000000000000","to":"0x000000000000000000000000000000000000dEaD","value":"0x0"}]}'

import { createPublicClient, http } from "viem";

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

const gas = await client.estimateGas({ account: from, to, value });
// Add headroom: state can change between estimate and inclusion
const gasLimit = (gas * 120n) / 100n;

Other methods on Morph

eth_estimateGas on other chains

Frequently asked questions

Does Morph support eth_estimateGas?

Yes. eth_estimateGas answered on the SwiftNodes Morph endpoint when our weekly probe called it through the customer path (2026-10-13).

How much gas does a plain transfer use on Morph?

eth_estimateGas returned 21,000 for a plain transfer on 2026-10-13.

What does "insufficient funds for gas * price + value" mean from eth_estimateGas on Morph?

The sender's balance cannot cover the value plus the gas. Fund the account or lower the value; the have and want figures in the message are in wei.

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

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