The polygon.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.

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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,

...

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Table Columns

Column NameDescription
block_numberThe length of the chain, in blocks.
block_timestampThe time when the block that contains this log was included on the blockchain.
block_hashUnique identifier of the block that includes this log.
addressThe address of the contract that emitted this log.
nameLog event name.
paramsDecoded parameters in JSON format.
dataUnindexed data containing further information of the event, encoded in hex.
topic0The keccak256 hash of a flattened event signature string.
topic1First indexed topic of the event.
topic2Second indexed topic of the event
topic3Third indexed topic of the event.
transaction_from_addressThe address of the sending party of this transaction.
transaction_to_addressThe address of the receiving party of this transaction.
transaction_hashUnique identifier of the transaction that this log belongs to.
transaction_indexThe position of this transaction in the block that it belongs to. The first transaction has index 0.
log_indexThe position of this log in the block that it belongs to. The first log has index 0.
signatureEvent log signature.
params_keys_mappingMapping of parameter keys in decoding.
interface_idInterface ID.
_created_atTimestamp of the entry creation.
_updated_atTimestamp of the entry update.