Chains API

The recent ERC-4337 bundle transactions on a chain

The chain's account-abstraction bundle transactions, newest first, 50 per page: transaction, block, time, bundler and how many user operations each carried.

GET/api/external/chain-analysis/user-operation-bundles/{chain}

Get a free API key Try it in the API reference

What it returns

The account-abstraction (ERC-4337) bundle transactions on one chain, newest first, 50 per page: the transaction, its block and time, the bundler that submitted it and how many user operations it carried. The operations themselves are in the user-operations resource (which can also filter by bundler). Keep passing nextCursor back as cursor until it is null.

Chains

Ethereum ETH
Robinhood Chain RHC
Optimism OP
Scroll SCROLL

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/user-operation-bundles/ETH"

Parameters
Parameter	Description
`cursor` query · string · optional	An opaque cursor from a previous response's `nextCursor`, for the next page. It only pages the chain it was issued for; an empty one, or one over 512 characters, is a 400 (enforced after the API-key gate).
`chain` path · string · required	RHC, ETH, OP and SCROLL only; 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 recent ERC-4337 bundle transactions on a chain
Field	Type	Description
`bundles`	object[]	Newest block first.
`bundles[].transactionHash`	string	The bundle transaction.
`bundles[].bundleIndex`	integer	Which bundle of that transaction this is; `0` unless one transaction carried several.
`bundles[].blockNumber`	integer	The block it ran in.
`bundles[].timestamp`	integer	Unix seconds of that block.
`bundles[].bundler`	string	The account that submitted the bundle.
`bundles[].totalOperations`	integer	The user operations the bundle carried.
`nextCursor`	string \| null	Pass back as `cursor` for the next page. `null` on the last page.

Price per call

Ethereum, Robinhood Chain, Optimism, Scroll: 1 credit

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

The recent ERC-4337 user operations on a chain
The operations one bundler submitted.
What one transaction did
One bundle transaction in full.
The blocks in a rollup settlement batch
Every rollup block one settlement batch carries, newest first, 50 per page: number, hash, timestamp, transaction count, gas and base fee.
The transactions in a rollup settlement batch
Every rollup transaction one settlement batch carries, newest first, 50 per page: hash, block, position, type, status, sender, recipient, value, fee and gas.
How far an L2's settlement on its parent chain has come
The newest settlement batch number (RHC), the batches committed since launch (SCROLL) or the dispute games created (OP): one exact chain-wide settlement number per L2.
The dispute games an OP-Stack chain settles its state with, newest first
An OP-Stack L2's fault-proof dispute games, newest first, 50 per page: the L2 block each one claims, when it was created and resolved, and whether the claim held.

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