trace_block on Optimism
Returns trace_* call traces for every transaction in a block — the trace-module equivalent of debug_traceBlockByNumber. Heavy; needs a free API key.
Flat trace_* actions for a whole block. The trace_ namespace is Erigon/OpenEthereum-lineage and not every client exposes it, so confirm support on the specific chain before relying on it.
Optimism endpoint (keyed — free)
https://rpc.nodeflare.app/op/v1/YOUR_KEYMethod
trace_block
Cost
100 CU
Chain ID
10
Block time
~2 s
Finality
~2 s soft · L1-final ~13 min
Tracing on Optimism
debug_ tracing is supported. Pre-Bedrock blocks (before June 2023) come from the legacy system and don't trace like Bedrock blocks; deposit transactions (type 0x7e) trace without a mempool counterpart.
Parameters
[blockNumber|tag]cURL
curl https://rpc.nodeflare.app/op/v1/YOUR_KEY \
-X POST \
-H 'content-type: application/json' \
-d '{"jsonrpc":"2.0","method":"trace_block","params":["latest"],"id":1}'ethers.js
import { ethers } from 'ethers';
const provider = new ethers.JsonRpcProvider(
'https://rpc.nodeflare.app/op/v1/YOUR_KEY'
);
const result = await provider.send('trace_block', ["latest"]);Try it live
Runs the example above against the public Optimism endpoint — straight from your browser.
trace_block on Optimism — FAQ
How do I call trace_block on Optimism?
POST a JSON-RPC 2.0 request with "method": "trace_block" to NodeFlare's Optimism endpoint at https://rpc.nodeflare.app/op/v1/YOUR_KEY. This method requires a free API key — it is not available on the public endpoint.
What does trace_block cost on the free tier?
trace_block is weighted at 100 compute units per call. The free tier includes 2,000,000 CU/month, so that is roughly 20,000 trace_block calls per month — no credit card.
Is trace_block available on the public Optimism endpoint?
No. trace_block 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 trace_block, eth_getLogs, trace_* and debug_*.
Anything Optimism-specific to know when using trace_block?
debug_ tracing is supported. Pre-Bedrock blocks (before June 2023) come from the legacy system and don't trace like Bedrock blocks; deposit transactions (type 0x7e) trace without a mempool counterpart.
Call trace_block on Optimism with a free key
2,000,000 compute units/month, heavy methods unlocked, every chain included. No credit card.
Get your free API key →