RPC method

eth_getTransactionCount on Unichain

Supported on SwiftNodes

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

What eth_getTransactionCount does

Returns the number of transactions an address has sent, which is the nonce its next transaction must use. With the pending tag it also counts the address's transactions waiting in the node's mempool.

eth_getTransactionCount on Unichain: what we measured

On an address that had just sent a transaction in the latest block (0xcabba9e7f4b3a885c5aa069f88469ac711dd4acc):

"latest"	200,687,989
"pending"	200,688,024

Which tag to use

"pending" was 35 ahead of "latest": the address had transactions waiting. Use "pending" for the next nonce, or you will reuse a nonce and replace a queued transaction.

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_getTransactionCount","params":["0xcabba9e7f4b3a885c5aa069f88469ac711dd4acc","pending"]}'

import { createPublicClient, http } from "viem";

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

const nonce = await client.getTransactionCount({ address, blockTag: "pending" });

// Sending several transactions: let viem track nonces locally
import { nonceManager, privateKeyToAccount } from "viem/accounts";
const account = privateKeyToAccount(key, { nonceManager });

Other methods on Unichain

eth_getTransactionCount on other chains

Frequently asked questions

Does Unichain support eth_getTransactionCount?

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

How do I get the next nonce on Unichain?

eth_getTransactionCount(address, "pending"). For several transactions in a row, increment locally.

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

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