trace_replayBlockTransactions

trace_replayBlockTransactions replays every transaction in a Base block and returns, for each one, a selectable combination of call-tree trace, opcode-level VM trace, and state diff. Base is Coinbase's OP Stack optimistic rollup that meters gas in ETH and settles to Ethereum L1. Send the request to https://base.therpc.io/YOUR_API_KEY (chain ID 8453, hex 0x2105) with a block specifier and a traceTypes array choosing trace, vmTrace, stateDiff, or any mix. The response is one replay result per transaction in block order, each carrying its transactionHash. It is the block-wide counterpart to trace_replayTransaction: where that method replays a single transaction, this one rebuilds the full execution and state changes for an entire Base block at once.

Use cases

• Produce a complete stateDiff audit for every transaction in a Base block, feeding a chain-analytics pipeline that needs precise per-block storage and balance changes.
• Reconstruct all ETH and token balance changes in a Base block for accounting or reconciliation, capturing transfers that never emitted an event.
• Analyze the full execution flow of all transactions in a known MEV-heavy Base block, combining trace and stateDiff to see how value moved through Aerodrome and Uniswap pools.

Parameters

Response

Example request

1curl https://base.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 Base playground.

Errors & troubleshooting

Common pitfalls

• This is the heaviest method in the trace namespace — it replays every transaction in the block and computes each requested trace type for all of them, so it can time out on a busy Base block.
• It requires a trace-enabled archive node; a pruned or non-trace node cannot serve it.
• Combining all three trace types on a dense Base block (the chain regularly packs blocks with consumer-app traffic) can produce hundreds of megabytes — request only the types you need.

Supported networks

• Mainnet — Chain ID: 8453
• Sepolia — Chain ID: 84532

See also

• trace_block
• trace_replayTransaction
• trace_call
• debug_traceBlockByNumber

1curl https://base.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":["",[]]}'