trace_transaction on Unichain

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

What trace_transaction does

Returns the Parity-style trace of one transaction: every internal call, creation and value transfer it caused. It is the usual tool for debugging a transaction after it has been mined.

trace_transaction on Unichain: what we measured

• Default Unichain routing keeps state for roughly the last 1,000,000 blocks (about 11.6 days of Unichain history). Tracing a transaction older than that needs historical state. Add &archive=1 to send the request to archive upstreams (paid plans).

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":"trace_transaction","params":["0x0000000000000000000000000000000000000000000000000000000000000000"]}'

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: trace_transaction on Unichain
const result = await client.request({
  method: "trace_transaction",
  params: ["0x0000000000000000000000000000000000000000000000000000000000000000"],
});

Other methods on Unichain

• eth_getLogsSupported
• eth_getBlockReceiptsSupported
• eth_feeHistorySupported
• eth_getProofSupported
• eth_createAccessListSupported
• debug_traceCallSupported
• trace_blockSupported

trace_transaction on other chains

Support differs by chain; the full measured table is on the trace_transaction 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