Chains API

Which contracts emitted this event in a block range?

Undecoded event logs from any contract on a chain in a block range, found by indexed topic: an event signature, or a wallet in an indexed argument.

GET/api/external/chain-analysis/event-log-search/{chain}

Get a free API key Try it in the API reference

What it returns

Raw, undecoded EVM logs any contract on the chain emitted between fromBlock and toBlock (inclusive) that carry the asked indexed topics, oldest first. At least one topic is required; several are ANDed. topic0 is the event signature hash; an address in topic1–topic3 is left-padded to 32 bytes, so topic2 set to a padded wallet and topic0 to the ERC-20 Transfer hash finds every token transfer into that wallet. At most 1000 logs: truncated means more logs match, and the ones listed are then not necessarily the earliest of the range — ask a narrower range to read them all. An empty logs means no log in the range matched.

Chains

BNB Chain BNB
Ethereum ETH
Stable STABLE
Base BASE

Request

Send your key in the x-dex-data-key header. Replace each <placeholder> with a real value.

curl -H "x-dex-data-key: $DEXDATA_API_KEY" \
  "https://api.dexdata.io/api/external/chain-analysis/event-log-search/BNB?fromBlock=<fromBlock>&toBlock=<toBlock>"

Parameters
Parameter	Description
`fromBlock` query · integer · required	Range start, inclusive.
`toBlock` query · integer · required	Range end, inclusive.
`topic0` query · string · optional	The event signature hash. 0x followed by 64 hexadecimal characters.
`topic1` query · string · optional	The first indexed argument. 0x followed by 64 hexadecimal characters.
`topic2` query · string · optional	The second indexed argument. 0x followed by 64 hexadecimal characters.
`topic3` query · string · optional	The third indexed argument. 0x followed by 64 hexadecimal characters.
`chain` path · string · required	ETH, BNB, BASE or STABLE; every other chain returns 400.

Response fields

A JSON response. Every field is always present; null means the value could not be established, never zero.

Response fields of Which contracts emitted this event in a block range?
Field	Type	Description
`logs`	object[]	Oldest first, by block then by position in the block.
`logs[].address`	string \| null	The contract that emitted the log.
`logs[].topics`	string[]	`topics[0]` is the event signature hash; the rest are indexed arguments.
`logs[].data`	string \| null	Raw ABI-encoded, non-indexed arguments. NOT decoded.
`logs[].block`	integer \| null
`logs[].blockHash`	string \| null
`logs[].at`	integer \| null	When its block was mined, Unix seconds.
`logs[].gasPriceRaw`	string \| null	The transaction's gas price, RAW wei, decimal string.
`logs[].gasUsedRaw`	string \| null	The gas the transaction used, decimal string.
`logs[].logIndex`	integer \| null	Position of the log in its block.
`logs[].transactionHash`	string \| null
`logs[].transactionIndex`	integer \| null
`truncated`	boolean	`true` when 1000 logs came back: more match, and the listed ones are not necessarily the earliest.

Price per call

BNB Chain, Ethereum, Stable, Base: 14 credits

Charged only when the call succeeds. Prices as of 2026-10-30; the current ones are always in the API reference.

Event log search brief: which contracts emitted an event, counted
The same answer in a compact response
Raw event logs emitted by a contract
The logs of one contract, rather than of every contract matching a topic.
What does this transaction payload call?
The logs come undecoded; decoding needs the event's ABI.
Current gas prices and confirmation time
Safe/Propose/Fast gas-price tiers for a chain and (Ethereum only) seconds each tier takes to confirm; on ARC and RHC the propose price and base fee only.
The newest blocks on a chain
The newest blocks one EVM chain has produced, head first, with hash, time, transaction count, gas, base fee and miner.
The block at a given time
Which block one chain was on at a Unix timestamp: the last block at or before it and the first after it, with number (the slot on SOL), hash and time.

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