# Debug and trace APIs

A dedicated Avalanche full or archive node has the debug_* API methods enabled. For the full list of the available debug and trace API methods, see Debug namespace (opens new window).

# Usage examples

You can debug and trace transactions on the Avalanche C-Chain by replaying them in the Ethereum Virtual Machine to get the execution details in the exact same way as they happened on the chain.

Note that to debug and trace transactions, you need to have historical states on the node. Avalanche full nodes keep historical states for the immediately previous 32 blocks. Avalanche archive nodes keep historical states for the entire chain.

# debug_traceBlockByNumber

Trace all transactions included in a block with debug_traceBlockByNumber (opens new window):

curl -H "Content-Type: application/json" -d '{"id": 1, "method": "debug_traceBlockByNumber", "params": ["BLOCK_NUMBER"]}' ENDPOINT

where

  • BLOCK_NUMBER — the number of the block in hex to get the traces of included transactions.
  • ENDPOINT — your node HTTPS endpoint.

See View node access and credentials.

For example, trace all smart contract interactions in block 17473827:

curl -H "Content-Type: application/json" -d '{"id": 1, "method": "debug_traceBlockByNumber", "params": ["0x10AA123", {"tracer": "callTracer"}]}' https://nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d