debug_traceTransaction on Arbitrum One
Re-executes a transaction and returns a full execution trace (opcodes, call tree, or a custom tracer like callTracer). Essential for debugging reverts and MEV analysis. A heavy archive-grade method; needs a free API key.
Pick the tracer deliberately: callTracer gives a compact decoded call/transfer tree (what most people want), while the default struct logger emits opcode-level output that can be enormous. Old txs need archive state — the priciest method we serve.
Arbitrum One endpoint (keyed — free)
https://rpc.nodeflare.app/arb/v1/YOUR_KEYMethod
debug_traceTransaction
Cost
100 CU
Chain ID
42161
Block time
~250 ms
Finality
<1 s sequencer · L1-final ~13 min
Tracing on Arbitrum One
Nitro supports debug_ tracing. Blocks from before the August 2022 Nitro migration ran on the classic stack and may not trace identically.
Parameters
[txHash, { tracer }]cURL
curl https://rpc.nodeflare.app/arb/v1/YOUR_KEY \
-X POST \
-H 'content-type: application/json' \
-d '{"jsonrpc":"2.0","method":"debug_traceTransaction","params":["0x0000000000000000000000000000000000000000000000000000000000000000", {"tracer": "callTracer"}],"id":1}'ethers.js
import { ethers } from 'ethers';
const provider = new ethers.JsonRpcProvider(
'https://rpc.nodeflare.app/arb/v1/YOUR_KEY'
);
const result = await provider.send('debug_traceTransaction', ["0x0000000000000000000000000000000000000000000000000000000000000000", {"tracer": "callTracer"}]);Try it live
Runs the example above against the public Arbitrum One endpoint — straight from your browser.
debug_traceTransaction on Arbitrum One — FAQ
How do I call debug_traceTransaction on Arbitrum One?
POST a JSON-RPC 2.0 request with "method": "debug_traceTransaction" to NodeFlare's Arbitrum One endpoint at https://rpc.nodeflare.app/arb/v1/YOUR_KEY. This method requires a free API key — it is not available on the public endpoint.
What does debug_traceTransaction cost on the free tier?
debug_traceTransaction is weighted at 100 compute units per call. The free tier includes 2,000,000 CU/month, so that is roughly 20,000 debug_traceTransaction calls per month — no credit card.
Is debug_traceTransaction available on the public Arbitrum One endpoint?
No. debug_traceTransaction is a heavy method and requires a free API key. The public no-key endpoint serves standard read methods; create a free key to unlock debug_traceTransaction, eth_getLogs, trace_* and debug_*.
Anything Arbitrum One-specific to know when using debug_traceTransaction?
Nitro supports debug_ tracing. Blocks from before the August 2022 Nitro migration ran on the classic stack and may not trace identically.
Call debug_traceTransaction on Arbitrum One with a free key
2,000,000 compute units/month, heavy methods unlocked, every chain included. No credit card.
Get your free API key →debug_traceTransaction on other chains
Other Arbitrum One methods
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