Glossary
Allow List
A list of smart contract recipients that are authorized to be run by the Lockup protocol upon withdraw and cancel.
Asset
Digital assets can exist in various forms, but the Sablier Protocols exclusively supports the streaming of ERC-20 assets.
The stream itself is represented as an NFT (ERC-721).
Broker
A third-party entity that interacts with the Sablier Protocols on behalf of its users, who may charge service fees for facilitating these interactions.
Broker fees
The fees collected by the broker upon creating a stream for their users.
Cliff
The cut-off point for releasing assets. Prior to the cliff, the recipient cannot withdraw, though assets continue to accrue in the stream.
DeFi
Short for Decentralized Finance: an ecosystem of financial applications and services built on blockchain networks, primarily Ethereum, that leverage smart contracts to enable trustless, permissionless, and transparent financial transactions without relying on traditional intermediaries like banks or financial institutions.
End time
The time when a stream is scheduled to end.
ERC-20
ERC-20 tokens are fungible tokens on Ethereum. Sablier supports all standard ERC-20 implementations, including those with the missing return value bug.
ERC-721
ERC-721 tokens are non-fungible tokens ("NFTs") on Ethereum. Sablier streams are represented as NFTs.
Ethereum
A global, open-source platform for decentralized applications.
Ethereum Virtual Machine
The technical architecture of Ethereum, which many other blockchains have appropriated.
Foundry
Foundry is the application development toolkit that has been used to develop the Sablier Protocols.
Gas Fee
Gas fees are transaction fees paid to the blockchain validators in native tokens such as ETH. Sablier Labs does not take any cut from this.
Gas is paid only when streams are created, canceled, transferred, or withdrawn from. It does not accrue in real-time.
Lockup
A term coined by us to refer to the requirement of locking up assets in order to create a stream.
Lockup Core
Smart contracts that are considered foundational, and are essential for Lockup to exist. Upgrading to a new version of lockup would require deploying an entirely new set of smart contracts, and would be considered a new version of the Lockup Protocol.
Lockup Periphery
Sablier contracts that are useful, but not required for Lockup to exist. New periphery contracts can always be deployed without migrating streams.
Lockup Dynamic
A Lockup stream with a payment rate per second that can vary over time.
Lockup Linear
A Lockup stream with a constant payment rate per second.
Lockup Tranched
A Lockup stream with payments in discrete tranches.
Monotonicity
A protocol invariant that states that the total amount of assets released by the stream can only increase over time and never decrease.
Protocol Admin
An entity with exclusive access to specific functions of the protocol.
Renounce
A renounced stream is a stream that cannot be canceled anymore.
PRBMath
PRBMath is fixed-point arithmetic library used by Sablier Core to compute percentage values and the exponents used in Lockup Dynamic.
Real-time finance
A term coined by us in 2019 to emphasize the wide-ranging use cases for the Sablier Protocols.
Since the withdrawable amounts in streams are updated every second, they embody the concept of real-time financial transactions.
Segment
A data object that encapsulates these three properties:
- Amount
- Exponent
- Timestamp
Segments are an essential component of Lockup Dynamic, as they facilitate the calculation of the custom streaming curve.
Start time
The time when a stream is scheduled to start.
Status
A stream can have one out of six possible statuses:
- Null
- Pending
- Streaming
- Settled
- Canceled
- Depleted
Stream
A new financial primitive that permits by-the-second payments.
Currently, the Sablier Protocols offer two types of stream called lockup and flow. In Lockup strean, creator has to lock up a specified amount of assets whereas in Flow streams, creator is not required to lock up any amount of assets.
Streaming
By-the-second payments.
Timestamp
A timestamp is the time component of a stream. In Lockup Linear, it represents start time, cliff time and end time whereas in lockup dynamic and lockup tranched, it plays a crucial role in the calculation of streaming curves.
Tranche
A data object that encapsulates these two properties:
- Amount
- Timestamp
Tranches are an essential component of Lockup Tranched, as they facilitate the calculation of the custom streaming curve.
Vesting
One of the most popular use cases for streaming today.
The purpose of vesting is to delay gratification. Founders, investors, and employees must wait a certain amount of time before being able to access tokens.