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eth_getLogs

Returns an array of all the logs matching the given filter object. See also the below Constraints section.

Parameters​

A filter object containing the following:

  • address: [optional] Contract address (20 bytes) or a list of addresses from which logs should originate.
  • fromBlock: [optional, default is "latest"] A hexadecimal block number, or one of the string tags latest, earliest, pending, safe, or finalized. See the default block parameter.
  • toBlock: [optional, default is "latest"] A hexadecimal block number, or one of the string tags latest, earliest, pending, safe, or finalized. See the default block parameter.
  • topics: [optional] Array of 32 bytes DATA topics. Topics are order-dependent.
  • blockhash: [optional] Restricts the logs returned to the single block referenced in the 32-byte hash blockHash. Using blockHash is equivalent to setting fromBlock and toBlock to the block number referenced in the blockHash. If blockHash is present in in the filter criteria, then neither fromBlock nor toBlock are allowed.

Returns​

log objects: An array of log objects, or an empty array if nothing has changed since last poll. Log objects contain the following keys and their values:

  • removed: (boolean) true when the log was removed, due to a chain reorganization. false if it's a valid log.
  • logIndex: Hexadecimal of the log index position in the block. Null when it is a pending log.
  • transactionIndex: Hexadecimal of the transactions index position from which the log created. Null when it is a pending log.
  • transactionHash: 32 bytes. Hash of the transactions from which this log was created. Null when it is a pending log.
  • blockHash: 32 bytes. Hash of the block where this log was in. Null when it is a pending log.
  • blockNumber: Block number where this log was in. Null when it is a pending log.
  • address: 20 bytes. Address from which this log originated.
  • data: Contains one or more 32-bytes non-indexed arguments of the log.
  • topics: An array of 0 to 4 indexed log arguments, each 32 bytes. In solidity the first topic is the hash of the signature of the event (e.g. Deposit(address,bytes32,uint256)), except when you declared the event with the anonymous specifier.

Example​

Replace YOUR-API-KEY with an API key from your Infura dashboard.

Request​

curl https://celo-alfajores.infura.io/v3/YOUR-API-KEY \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_getLogs","params":[{"blockHash": "0x7c5a35e9cb3e8ae0e221ab470abae9d446c3a5626ce6689fc777dcffcab52c70", "topics":["0x241ea03ca20251805084d27d4440371c34a0b85ff108f6bb5611248f73818b80"]}],"id":1}'

Response​

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "address": "0x1a94fce7ef36bc90959e206ba569a12afbc91ca1",
      "blockHash": "0x7c5a35e9cb3e8ae0e221ab470abae9d446c3a5626ce6689fc777dcffcab52c70",
      "blockNumber": "0x5c29fb",
      "data": "0x0000000000000000000000003e3310720058c51f0de456e273c626cdd35065700000000000000000000000000000000000000000000000000000000000003185000000000000000000000000000000000000000000000000000000000000318200000000000000000000000000000000000000000000000000000000005c2a23",
      "logIndex": "0x1d",
      "removed": false,
      "topics": [
        "0x241ea03ca20251805084d27d4440371c34a0b85ff108f6bb5611248f73818b80"
      ],
      "transactionHash": "0x3dc91b98249fa9f2c5c37486a2427a3a7825be240c1c84961dfb3063d9c04d50",
      "transactionIndex": "0x1d"
    },
    {
      "address": "0x06012c8cf97bead5deae237070f9587f8e7a266d",
      "blockHash": "0x7c5a35e9cb3e8ae0e221ab470abae9d446c3a5626ce6689fc777dcffcab52c70",
      "blockNumber": "0x5c29fb",
      "data": "0x00000000000000000000000077ea137625739598666ded665953d26b3d8e374400000000000000000000000000000000000000000000000000000000000749ff00000000000000000000000000000000000000000000000000000000000a749d00000000000000000000000000000000000000000000000000000000005c2a0f",
      "logIndex": "0x57",
      "removed": false,
      "topics": [
        "0x241ea03ca20251805084d27d4440371c34a0b85ff108f6bb5611248f73818b80"
      ],
      "transactionHash": "0x788b1442414cb9c9a36dba2abe250763161a6f6395788a2e808f1b34e92beec1",
      "transactionIndex": "0x54"
    }
  ]
}

Constraints​

The following constraints apply:

To prevent queries from consuming too many resources, eth_getLogs requests are currently limited by three constraints:

  • A maximum of 5,000 parameters in a single request
  • A maximum of 10,000 results can be returned by a single query
  • Query duration must not exceed 10 seconds

If a query returns too many results or exceeds the max query duration, one of the following errors is returned:

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32005,
    "message": "query returned more than 10000 results"
  }
}

or

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32005,
    "message": "query timeout exceeded"
  }
}

If this happens:

  • Limit your query to a smaller number of blocks using fromBlock and toBlock.
  • If querying for commonly used topics, consider limiting to a single smart contract address.