Chains API

The transaction at a given position in a block

The transaction at one index of an EVM block named by number or hash: sender, recipient, value, nonce, type, gas limit, fee caps and method, plus the block's transaction count.

GET/api/external/chain-analysis/block-transaction/{chain}

Get a free API key Try it in the API reference

What it returns

The transaction at position index (from 0) of one block named by height or hash, as the block records it: hash, sender, recipient, value, nonce, type, gas limit and fee caps, and the method called. It is the signed transaction, not its outcome: no status, gas used or events. The answer also gives how many transactions the block holds, so a caller can walk the block. transaction is null when the block holds fewer, and both fields are null when the chain has no such block. Ethereum keeps blocks from 15,500,000, Base keeps transactions from 50,000,000 and Stable about the last two million blocks (some two weeks); an older block is a 400, naming the oldest one kept when the chain says. On Stable an older hash reads as unknown: both null.

Chains

BNB Chain BNB
Ethereum ETH
Stable STABLE
Base BASE
Robinhood Chain RHC
Arc ARC

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/block-transaction/BNB?index=<index>"

Parameters
Parameter	Description
`blockNumber` query · integer · optional	The block height. Give this or `blockHash`, not both.
`blockHash` query · string · optional	The block hash, 0x followed by 64 hexadecimal characters. Give this or `blockNumber`, not both.
`index` query · integer · required	The position in the block, from 0: 0 to 99999.
`chain` path · string · required	ETH, BNB, BASE, STABLE, ARC or RHC; 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 The transaction at a given position in a block
Field	Type	Description
`transactionCount`	integer \| null	How many transactions the block holds; 0 is a real empty block. null when the chain has no such block.
`transaction`	object \| null	The transaction at `index`, or null when the block does not exist or holds fewer.
`transaction.hash`	string	The transaction hash, lowercase.
`transaction.index`	integer	Its position in the block, the `index` asked for.
`transaction.blockNumber`	integer	The block height.
`transaction.blockHash`	string	The block hash, lowercase.
`transaction.blockTimestamp`	integer \| null	Unix seconds the block was produced at; null when the chain does not attach it to the transaction.
`transaction.from`	string	The sender, lowercase.
`transaction.to`	string \| null	The recipient or contract called, lowercase; null when the transaction creates a contract.
`transaction.valueWei`	string	Native coin sent, in wei, as a decimal string. "0" is a real value.
`transaction.nonce`	integer	The sender's nonce.
`transaction.type`	integer \| null	The transaction type: 0 legacy, 1 access list, 2 fee market, 3 blob, 4 set code; other numbers are chain-specific, such as Base's 126 for a deposit.
`transaction.gasLimit`	string	The gas limit the sender set, as a decimal string.
`transaction.gasPriceWei`	string \| null	The gas price the chain reports for it, in wei, as a decimal string; null when none is reported.
`transaction.maxFeePerGasWei`	string \| null	The fee cap of a fee-market transaction, in wei; null for other types.
`transaction.maxPriorityFeePerGasWei`	string \| null	The priority fee cap of a fee-market transaction, in wei; null for other types.
`transaction.methodId`	string \| null	The first four bytes of the call data, the method selector; null when the call data is shorter.
`transaction.inputBytes`	integer	Length of the call data in bytes; 0 for a plain transfer.

Price per call

BNB Chain, Ethereum, Stable, Base, Robinhood Chain, Arc: 1 credit

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

What one transaction did
Take the hash and read the outcome: status, gas used and fee paid.
A block's transactions
Every transaction of the block at once rather than one position.
Look up one block by its number or hash
The block's header: time, gas, base fee and miner.
Which accounts did a block touch, and what did it change?
Every account one ETH or BASE block touched: balance and nonce changes, code changes and storage slots written and read, with totals for the block.
How much stablecoin value sits on this chain, and which stablecoin dominates it?
One chain's total stablecoin supply today in USD, split by peg currency, with the largest stablecoin on the chain and its share.
How have DEX volume, fees and revenue on this chain moved?
One chain's daily DEX trading volume, fees paid or protocol revenue in USD, over 7 to 365 days or its whole history.

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