base_transactionStatus

Reports whether a specific transaction is present in the node mempool. Use it to confirm that a submitted transaction has been received before it appears in a Flashblock.

A Base pre-confirmation method served on the standard public endpoints (https://mainnet.base.org / https://sepolia.base.org), which are all Flashblocks-enabled.

Requires base/base minimum client version v0.3.0.

Parameters

Name	Type	Required	Description
transactionHash	string	Yes	The 32-byte transaction hash to query.

Returns

result is the transaction status object:

Field	Type	Description
status	string	"Known" if the transaction is present in the mempool. "Unknown" if the node has not seen it.

Example

Request

curl https://mainnet.base.org \
  -X POST -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"base_transactionStatus","params":["0xabc123..."],"id":1}'

Response (Known)

{"jsonrpc": "2.0", "id": 1, "result": {"status": "Known"}}

Response (Unknown)

{"jsonrpc": "2.0", "id": 1, "result": {"status": "Unknown"}}