trace_replayBlockTransactions

trace_replayBlockTransactions replays every transaction in one Arbitrum One block and returns, per transaction, whichever combination of OpenEthereum-style trace (call tree), vmTrace (opcode-level), and stateDiff (balance/nonce/code/storage changes) you ask for in traceTypes. It is the block-wide version of trace_replayTransaction and the richest read in the trace namespace. Arbitrum One is a Nitro Optimistic Rollup (chain ID 42161) settling to Ethereum L1 with gas in ETH, so a full stateDiff for a block captures every L2 ledger change at once. Send requests to https://arbitrum.therpc.io/YOUR_API_KEY.

Use cases

• Produce a complete stateDiff audit for every transaction in an Arbitrum One block to feed a chain analytics or accounting pipeline.
• Reconstruct all ETH and token balance changes in a block for ledger reconciliation across the Arbitrum ecosystem.
• Analyze the full execution flow of every transaction in a known MEV block, for example around Camelot or GMX activity.

Parameters

Response

Example request

1curl https://arbitrum.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H "Content-Type: application/json" \
4  -d '{
5    "jsonrpc": "2.0",
6    "method": "trace_replayBlockTransactions",
7    "params": [
8        "latest",
9        [
10          "trace"
11        ]
12      ],
13    "id": 1
14  }'

Try it live in the Arbitrum One playground.

Errors & troubleshooting

Common pitfalls

• This is the heaviest call in the trace namespace: it replays every transaction in the block and computes each requested trace type, so a busy Arbitrum One block can time out.
• Requires a trace-enabled archive node holding the block's ArbOS state; pruned and most public endpoints will reject it.
• Combining all three traceTypes on a dense Arbitrum One block can return hundreds of MB — request only the trace types you actually consume.

Supported networks

• Mainnet — Chain ID: 42161
• Sepolia — Chain ID: 421614

See also

• trace_block
• trace_replayTransaction
• trace_call
• debug_traceBlockByNumber

1curl https://arbitrum.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H 'Content-Type: application/json' \
4  -d '{"jsonrpc":"2.0","id":1,"method":"trace_replayBlockTransactions","params":["",[]]}'