trace_block

trace_block returns the OpenEthereum-style call-tree traces for every transaction in a single Avalanche C-Chain block, selected by block number or by a tag such as latest. The C-Chain is Avalanche's EVM chain, where AVAX is the gas token and Snowman consensus finalizes blocks in roughly one to two seconds. Unlike the opcode-level debug_* tracers, this returns a flat list of call/create/suicide actions, which is ideal for extracting internal transfers at scale. Send the request to https://avalanche.therpc.io/YOUR_API_KEY (chain ID 43114, hex 0xa86a). Each trace in the flat array carries a transactionPosition so you can tell which transaction it belongs to.

Use cases

• Extract every internal transaction in a C-Chain block for an Avalanche block explorer or analytics pipeline.
• Analyze MEV activity across all transactions in one block on Avalanche DeFi venues like Trader Joe and GMX.
• Track AVAX and token value flowing into and out of a contract across an entire block in a single call.

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_block",
7    "params": ["latest"],
8    "id": 1
9  }'

Try it live in the Avalanche playground.

Errors & troubleshooting

Common pitfalls

• It returns every trace for every transaction, so a busy C-Chain block produces a very large response — plan for the payload size.
• It needs a trace-enabled archive node; the standard debug namespace is not enough, and many public Avalanche endpoints do not expose the trace namespace at all.
• Avoid the pending tag for production data — on a chain that produces a block every second or two, the pending set can change before the block is finalized.

Supported networks

• Mainnet — Chain ID: 43114
• Fuji

See also

• trace_transaction
• trace_filter
• trace_replayBlockTransactions
• 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_block","params":["latest"]}'