Looks for the datum hash presence in the mempool.
`Command syntax:`
```actionscript
mempool check
-net <net_name>
-datum <datum_hash>
[-chain <chain_name>]
```
`Options:`
```actionscript
-net - name of the Cellframe Network. The list of networks can be found in the <Config_dir> \ etc \ network folder or received by The Cellframe-Node-CLI using command - net list
-datum - hash of the datum
-chain - name of the chain (optional)
```
### CLI Example
`Command:`
```actionscript
cellframe-node-cli mempool check
-net riemann
-chain main
-datum 0xC203EA5BB6C5C4297B3885549771C2C1526D7475AE6449668BC512B4E119966A
```
`Response:`
```
hash: 0xC203EA5BB6C5C4297B3885549771C2C1526D7475AE6449668BC512B4E119966A
net: riemann
chain: main
find: true
source: mempool
```
### JSON-RPC Example
![[JSON-RPC Request - MEMPOOL CHECK]]