trace_replayTransaction

trace_replayTransaction replays one confirmed Avalanche C-Chain transaction and returns a combination you choose of call-tree trace, opcode-level VM trace, and state diff. The C-Chain is Avalanche's EVM chain, where gas is paid in AVAX and Snowman consensus finalizes blocks in roughly one to two seconds. The stateDiff artifact is the key draw: it shows exactly how each touched account's balance, nonce, code, and storage changed, expressed with Parity's =/+/-/* notation. Send the request to https://avalanche.therpc.io/YOUR_API_KEY (chain ID 43114, hex 0xa86a) with the transaction hash and a traceTypes array selecting "trace", "vmTrace", and/or "stateDiff".

Use cases

• Reconstruct the exact storage changes a historical C-Chain transaction caused for forensic analysis of an Avalanche contract.
• Debug a revert by reading the stateDiff to see which storage slot or balance triggered the failure.
• Produce a complete audit trail of AVAX balance and storage changes for a single transaction for compliance reporting.

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_replayTransaction",
7    "params": [
8        "0x0000000000000000000000000000000000000000000000000000000000000000",
9        [
10          "trace"
11        ]
12      ],
13    "id": 1
14  }'

Try it live in the Avalanche playground.

Errors & troubleshooting

Common pitfalls

• Requesting vmTrace on a complex C-Chain transaction produces enormous output; prefer "trace" or "stateDiff" when you do not need opcode-level detail.
• It requires a trace-enabled archive node; most public Avalanche endpoints do not expose the trace namespace.
• The vmTrace format is Parity-specific — do not confuse it with Geth's debug_traceTransaction structLog format when wiring up tooling.

Supported networks

• Mainnet — Chain ID: 43114
• Fuji

See also

• trace_transaction
• trace_replayBlockTransactions
• trace_call
• debug_traceTransaction

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_replayTransaction","params":["0x0000000000000000000000000000000000000000000000000000000000000000",[]]}'