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Decoded Logs

The ethereum.decoded.logs table includes additional decoded columns on top of what is in the raw logs table.

Using Decoded Logs

In general, we recommend using this combination of params and params_keys_mapping on all of your production pipelines, since it guarantees that your query won’t break if the field names ever change
Logs are decoded via topic0, but they do not specify the name of the params. As a result, there may be inconsistencies in the decoded params field while the underlying values is correct. Field name changes over time are influenced by contract ABIs used during log decoding. We prioritize contract-specific ABIs but may fallback to generic ABIs. Historical records aren't retroactively updated to maintain query consistency.

Using Params Key Mapping

Using Uniswap v3 Swap() event params as an example, we first reference the params field:
{ "amount0": "-718884554", "amount1": "600000000000000000", "liquidity": "11511633818000282989", "recipient": "0xd034d7e8b27b99b5674f2d412584a2897fc87eae", "sender": "0x68b3465833fb72a70ecdf485e0e4c7bd8665fc45", "sqrtPriceX96": "2285459885189609648572828648093816", "tick": "205405" }
Then look at the params_keys_mapping:
[ "sender", "recipient", "amount0", "amount1", "sqrtPriceX96", "liquidity", "tick" ]
From there, rewrite the query using params[params_keys_mapping[index]] syntax:
select
params[params_keys_mapping[0]] as sender,
params[params_keys_mapping[1]] as recipient,
...

Table Columns

Column Name
Description
block_number
The length of the chain, in blocks.
block_timestamp
The time when the block that contains this log was included on the blockchain.
block_hash
Unique identifier of the block that includes this log.
address
The address of the contract that emitted this log.
name
Log event name.
params
Decoded parameters in JSON format.
data
Unindexed data containing further information of the event, encoded in hex.
topic0
The keccak256 hash of a flattened event signature string.
topic1
First indexed topic of the event.
topic2
Second indexed topic of the event
topic3
Third indexed topic of the event.
transaction_from_address
The address of the sending party of this transaction.
transaction_to_address
The address of the receiving party of this transaction.
transaction_hash
Unique identifier of the transaction that this log belongs to.
transaction_index
The position of this transaction in the block that it belongs to. The first transaction has index 0.
log_index
The position of this log in the block that it belongs to. The first log has index 0.
signature
Event log signature.
params_keys_mapping
Mapping of parameter keys in decoding.
interface_id
Interface ID.
_created_at
Timestamp of the entry creation.
_updated_at
Timestamp of the entry update.
Last modified 28d ago