eth_getFilterChanges - Polygon
Polygon API - Polling method for a filter, which returns an array of logs which occurred since last poll.

Parameters

  1. 1.
    QUANTITY - the filter id.
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params: [
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"0xfe704947a3cd3ca12541458a4321c869"
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]
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Returns

Array - Array of log objects, or an empty array if nothing has changed since last poll.
  • For filters created with eth_newBlockFilter the return are block hashes (DATA, 32 Bytes), e.g. ["0x3454645634534..."].
  • For filters created with eth_newPendingTransactionFilter the return are transaction hashes (DATA, 32 Bytes), e.g. ["0x6345343454645..."].
  • For filters created with eth_newFilter logs are objects with following params:
    • removed: TAG - true when the log was removed, due to a chain reorganization. false if its a valid log.
    • logIndex: QUANTITY - integer of the log index position in the block. null when its pending log.
    • transactionIndex: QUANTITY - integer of the transactions index position log was created from. null when its pending log.
    • transactionHash: DATA, 32 Bytes - hash of the transactions this log was created from. null when its pending log.
    • blockHash: DATA, 32 Bytes - hash of the block where this log was in. null when its pending. null when its pending log.
    • blockNumber: QUANTITY - the block number where this log was in. null when its pending. null when its pending log.
    • address: DATA, 20 Bytes - address from which this log originated.
    • data: DATA - contains one or more 32 Bytes non-indexed arguments of the log.
    • topics: Array of DATA - Array of 0 to 4 32 Bytes DATA of indexed log arguments.
      • In solidity: The first topic is the hash of the signature of the event (e.g. Deposit(address,bytes32,uint256)), except you declare the event with the anonymous specifier.

Example

The Alchemy Composer allows you to make a no-code example request via your browser. Try it out above!

Request

Curl
Postman
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curl https://eth-mainnet.alchemyapi.io/v2/your-api-key \
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-X POST \
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-H "Content-Type: application/json" \
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-d '{"jsonrpc":"2.0","method":"eth_getFilterChanges","params":["0xfe704947a3cd3ca12541458a4321c869"],"id":73}'
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URL: https://eth-mainnet.alchemyapi.io/v2/your-api-key
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RequestType: POST
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Body:
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{
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"jsonrpc":"2.0",
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"method":"eth_getFilterChanges",
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"params":["0xfe704947a3cd3ca12541458a4321c869"],
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"id":73
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}
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Result

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{
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"jsonrpc": "2.0",
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"id": 73,
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"result": [{
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"address": "0xb5a5f22694352c15b00323844ad545abb2b11028",
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"blockHash": "0x99e8663c7b6d8bba3c7627a17d774238eae3e793dee30008debb2699666657de",
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"blockNumber": "0x5d12ab",
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"data": "0x0000000000000000000000000000000000000000000000a247d7a2955b61d000",
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"logIndex": "0x0",
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"removed": false,
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"topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef", "0x000000000000000000000000bdc0afe57b8e9468aa95396da2ab2063e595f37e", "0x0000000000000000000000007503e090dc2b64a88f034fb45e247cbd82b8741e"],
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"transactionHash": "0xa74c2432c9cf7dbb875a385a2411fd8f13ca9ec12216864b1a1ead3c99de99cd",
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"transactionIndex": "0x3"
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}, {
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"address": "0xe38165c9f6deb144afc9c32c206b024817e1496d",
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"blockHash": "0x99e8663c7b6d8bba3c7627a17d774238eae3e793dee30008debb2699666657de",
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"blockNumber": "0x5d12ab",
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"data": "0x0000000000000000000000000000000000000000000000000000000025c6b720",
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"logIndex": "0x3",
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"removed": false,
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"topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef", "0x00000000000000000000000080e73e47173b2d00b531bf83bc39e710157125c3", "0x0000000000000000000000008f6cc93795969e5bbbf07c66dfee7d41ad24f1ef"],
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"transactionHash": "0x9e8f1cb1facb9a11a1cf947634053a0b2d557399f926b12127aa10497a2f0153",
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"transactionIndex": "0x5"
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}
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}
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Polygon API
Alchemy Documentation