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Base contract event logs

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Full response envelope

What you receive

Demonstration data only. The paid endpoint returns a fresh result and settlement receipt.

{
  "request_id": "018f1f54-7f38-7ba2-8dc3-5f90272d9f1a",
  "service": "crypto.base-event-logs",
  "version": "1",
  "data": {
    "network": "eip155:8453",
    "filter": {
      "contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "topics": [
        "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"
      ]
    },
    "blockRange": {
      "requestedTag": "safe",
      "fromBlock": 34567791,
      "toBlock": 34567890,
      "toBlockHash": "0x1111111111111111111111111111111111111111111111111111111111111111",
      "toBlockTimestamp": "2026-08-10T16:00:00+00:00",
      "requestedLookbackBlocks": 100,
      "scannedBlocks": 100
    },
    "queriedLogCount": 1,
    "detected": 1,
    "returned": 1,
    "truncated": false,
    "duplicatesRemoved": 0,
    "removedSkipped": 0,
    "logs": [
      {
        "contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "topics": [
          "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
          "0x0000000000000000000000002222222222222222222222222222222222222222",
          "0x0000000000000000000000001111111111111111111111111111111111111111"
        ],
        "data": {
          "hex": "0x0000000000000000000000000000000000000000000000000000000000bebc20",
          "bytes": 32,
          "returnedBytes": 32,
          "truncated": false,
          "sha256": "1075ad1aeb25e2412faa67043b490dd6375967f6502d383f5a8a85b4e56e92d0"
        },
        "blockNumber": 34567800,
        "blockHash": "0x2222222222222222222222222222222222222222222222222222222222222222",
        "transactionHash": "0x3333333333333333333333333333333333333333333333333333333333333333",
        "transactionIndex": 4,
        "logIndex": 7,
        "explorerUrl": "https://basescan.org/tx/0x3333333333333333333333333333333333333333333333333333333333333333"
      }
    ],
    "networkRequestsMade": 51,
    "rpcCallsMade": 51,
    "readOnly": true,
    "transactionBroadcast": false,
    "warnings": [],
    "limitations": [
      "Signature-only scans use newest-first 2-block chunks and may stop after the result limit; indexed-topic scans can cover up to 2,000 blocks in one query.",
      "Covers only the resolved block range, not full contract history.",
      "Payload is ABI-encoded; finality and freshness depend on the tag and RPC provider."
    ],
    "contractExplorerUrl": "https://basescan.org/address/0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "source": "https://docs.base.org/base-chain/api-reference/ethereum-json-rpc-api/eth_getLogs",
    "disclaimer": "Public logs do not prove identity, ownership, authorization, or state."
  },
  "meta": {
    "duration_ms": 42,
    "cached": false,
    "sources": [],
    "warnings": [],
    "next_actions": []
  }
}

Example request

Input JSON

{
  "contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "topics": [
    "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"
  ],
  "lookback_blocks": 100,
  "limit": 25,
  "block_tag": "safe"
}

Delivery contract

One paid POST

Query validated eth_getLogs events from one Base mainnet contract using a required event signature and optional indexed topic filters across a bounded resolved block range.

POST /v1/crypto/base-event-logs

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