trace_replayBlockTransactions

trace_replayBlockTransactions replays every transaction in an Avalanche C-Chain block and returns, for each one, a selectable combination of call-tree trace, opcode-level VM trace, and state diff. The C-Chain is Avalanche's EVM chain, where AVAX pays for gas and Snowman consensus finalizes blocks in roughly one to two seconds. You choose which artifacts to compute through the traceTypes array ("trace", "vmTrace", "stateDiff"), letting you get a full per-block audit in one request. Send the call to https://avalanche.therpc.io/YOUR_API_KEY (chain ID 43114, hex 0xa86a); the result is an array of per-transaction replay objects in block order, each carrying its transactionHash.

Use cases

• Produce a complete stateDiff audit for every transaction in a C-Chain block for an Avalanche analytics pipeline.
• Reconstruct all AVAX and token balance changes in a block for accounting or reconciliation.
• Analyze the full execution flow of every transaction in a known Avalanche MEV block in one pass.

Parameters

Response

Example request

1curl https://avalanche.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 Avalanche playground.

Errors & troubleshooting

Common pitfalls

• This is the heaviest method in the trace namespace — it replays every transaction and computes each requested trace type, so it can time out on a busy Avalanche block.
• It requires a trace-enabled archive node; most public C-Chain endpoints do not expose the trace namespace.
• Combining all three traceTypes on a dense block can produce hundreds of MB of data; request only the artifacts you actually need.

Supported networks

• Mainnet — Chain ID: 43114
• Fuji

See also

• trace_block
• trace_replayTransaction
• trace_call
• debug_traceBlockByNumber

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