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 Name

Description

Example

name

Decoded event log name.

Swap

params

Decoded parameters in JSON format.

{ "amount0In": "0", "amount0Out": "10000000000000000000000", "amount1In": "16962444212633508", "amount1Out": "0", "sender": "0xc6265979793435b496e28e61af1500c22c3ba277", "to": "0xb77dc27d092d2ee46043a7f70ff869533c44082f" }

signature

Event log signature.

Swap(address,uint256,uint256,uint256,uint256,address)

transaction_hash

Unique identifier of the transaction that contains this log.

0xb67e3832a67dc9626479acb092e61c878d14b3744bbf90803a3ca6efd7107da7

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.

210

address

The address of the contract that emitted this log.

0x7c564421de1fa9fc10cba2a392451e6b72d2557f

data

Unindexed data containing further information of the event, encoded in hex.

0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003c4340cdd0ffa400000000000000000000000000000000000000000000021e19e0c9bab24000000000000000000000000000000000000000000000000000000000000000000000

topic0

The keccak256 hash of a flattened event signature string.

0xd78ad95fa46c994b6551d0da85fc275fe613ce37657fb8d5e3d130840159d822

topic1

First indexed topic of the event.

0x000000000000000000000000c6265979793435b496e28e61af1500c22c3ba277

topic2

Second indexed topic of the event.

0x000000000000000000000000b77dc27d092d2ee46043a7f70ff869533c44082f

topic3

Third indexed topic of the event.

transaction_from_address

The address of the sending party of this transaction.

0xb77dc27d092d2ee46043a7f70ff869533c44082f

transaction_to_address

The address of the receiving party of this transaction.

0xdb5889e35e379ef0498aae126fc2cce1fbd23216

interface_id

Interface ID.

3b0281affe1a62ff1ca7c26385e1105a

params_keys_mapping

Mapping of parameter keys in decoding.

[ "sender", "amount0In", "amount1In", "amount0Out", "amount1Out", "to" ]

block_timestamp

The time when the block that contains this log was included on the blockchain.

2023-12-03 20:23:11.000

block_number

The length of the chain, in blocks.

18708213

block_hash

Unique identifier of the block that includes this log.

0xbcde8785ea4c6d4acffc84c344230b6a1eeb1b6f0d91ce66993c4d251d278545

_created_at

Timestamp of the entry creation.

2023-12-03 20:29:35.910

_updated_at

Timestamp of the entry update.

2023-12-03 20:29:35.910

Last updated 3 months ago