Cancelability
Lockup Streams
When creating a Lockup stream, users have the ability to set the stream as cancelable, or uncancelable.
If cancelable, the stream can be stopped at any time by the stream creator, with the unstreamed funds being returned over to the stream creator.
Example: If you are using Sablier Lockup for Employee Token Vesting, and one of your employees leaves your company, you can cancel the stream and get the tokens back which haven't yet been vested to the ex-employee at that specific time. Any tokens vested out before that are obviously now owned by the recipient.
When a stream is canceled (stopped), there is no way to uncancel it (start it again). You will need to create a new stream in that case.
If uncancelable, there is no way to cancel the stream, and the recipient is guaranteed to receive the funds.
A cancelable stream can be set as uncancelable at any point in time by the stream creator. On the other hand, an uncancelable stream cannot be set as cancelable by the stream creator.
Recipients do not have the ability to cancel a stream.
Merkle Airdrop campaigns
If you have created a merkle campaign and made a mistake, you can recover the funds from the campaign that haven't yet been claimed in the following cases:
- Before any user claimed from the campaign
- Up until 7 days after the first claim took place
- After the claim window ends (assuming it's enabled)
If you haven't set up a claim window, you can only recover the funds you deposited into the campaign up until 7 days after the first claim took place, or as long as you like if there are no claims. Assuming there are claims, after the 7-day period passes, you will not have the ability anymore to recover the funds deposited into the campaign contract. They will stay there forever until claimed by eligible recipients.
If you have set up a claim window, after the claim window ends, you have the ability to get the funds back which haven't yet been claimed by that time.
It's important to mention that the airstreams created through the merkle campaigns can be set as cancelable, the above points are related to the campaign itself, not the streams created through users claiming from the campaign.
Example: you create an Airstream campaign. You deposit 1000 USDC in it. You set up the streams as cancelable, but there is no claim window. All eligible users claim from the campaign at the same time, and 8 days later, you realize you made a mistake. While you cannot recover the funds through the campaign as the 7-day period has passed, you can cancel the streams that were created and get the funds back which haven't been paid out at that specific time to the recipients.
Ranged Airstreams
In case of Ranged Airstreams, the vesting begins and ends at the same time for all the recipients, provided by the campaign creator.
If campaign creator wishes to cancel unclaimed Ranged Airstreams before the campaign expiry, the creator would have to trigger claims on behalf of the recipients and then cancel the Lockup streams.
On the other hand, to cancel claimed Ranged Airstreams, campaign creator can simply cancel them through the Sablier interface, provided they were set as cancelable during campaign launch.
Non-Ranged Airstreams
For all the claimed Non-Ranged Airstreams, campaign creator can cancel them through the Sablier interface, provided they were set as cancelable during campaign launch.
For all non-claimed Non-Ranged Airstreams, because the vesting does not begin until the user claims, campaign creator can wait until the campaign expiry to recover the unclaimed funds.
Flow Streams
Flow Streams do not offer the ability to cancel the stream. However, the stream creator can pause a Flow stream at any time and resume it at any time making it a more flexible option for payments.