Transactions API

What one ERC-4337 user operation did

One account-abstraction user operation by hash: its smart account, bundler, paymaster, entry point, bundle transaction, fee and whether it succeeded.

GET/api/external/transaction-analysis/user-operation/{chain}/{hash}

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What it returns

One account-abstraction (ERC-4337) user operation, by its hash: the smart account that sent it, the bundler that submitted it, the paymaster that paid its gas (if any), the factory that deployed the account in it (if any), the entry point, the bundle transaction and block it ran in, what it paid, and whether it succeeded — with the revert reason when it did not. operation is null when the hash is not a known user operation on the chain (never sent, not indexed yet, or a transaction hash rather than an operation hash).

Chains

Ethereum ETH
Robinhood Chain RHC

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/transaction-analysis/user-operation/ETH/<hash>"

Parameters
Parameter	Description
`chain` path · string · required	ETH and RHC only; every other chain returns 400.
`hash` path · string · required	The ERC-4337 user operation hash (0x followed by 64 hexadecimal characters) — the operation's own hash, not the hash of the bundle transaction that carried it.

Response fields

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

Response fields of What one ERC-4337 user operation did
Field	Type	Description
`hash`	string	The operation hash, lowercase.
`operation`	object \| null	The operation, or `null` when the hash is not a known user operation.
`operation.sender`	string	The smart account that sent the operation.
`operation.bundler`	string	The account that submitted the bundle transaction carrying it.
`operation.paymaster`	string \| null	The contract that paid its gas; `null` when the smart account paid for itself.
`operation.factory`	string \| null	The factory that deployed the smart account in this operation; `null` when the account already existed.
`operation.entryPoint`	string	The ERC-4337 entry point contract it went through.
`operation.entryPointVersion`	string \| null	The entry point version, e.g. `"v0.7"`; `null` when not known.
`operation.transactionHash`	string	The bundle transaction the operation ran in.
`operation.blockNumber`	integer	The block it ran in.
`operation.timestamp`	integer	Unix seconds of that block.
`operation.success`	boolean	Whether the operation's own execution succeeded.
`operation.revertReason`	string \| null	Why it failed, as recorded — often the raw revert data in hex. `null` on success, and on a failure with no reason recorded.
`operation.feeWei`	string \| null	What the operation paid, in wei of the chain's native coin, as a decimal string. `"0"` is a real zero — the operation itself was charged nothing and whoever bundled it absorbed the cost, which is common on both served chains and does not mean the chain is free. `null` when not known.
`operation.gasUsed`	string \| null	The gas it used, as a decimal string; `null` when not known.
`operation.callTarget`	string \| null	The contract the smart account called, when it made one call; `null` on a batch of calls or when not known.
`operation.callMethod`	string \| null	The smart-account method the operation invoked, e.g. `"execute(address target, uint256 value, bytes data)"`; `null` when it could not be decoded.

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