Decoded Logs

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 NameDescription

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.

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