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Zoe API
Zoe v0.24.0. Last updated August 25, 2022.
The Zoe framework provides a way to write smart contracts without having to worry about offer safety. To use Zoe, we put things in terms of "offers". An offer proposal is a statement about what you want and what you're willing to offer. It turns out, many smart contracts (apart from gifts and one-way payments) involve an exchange of digital assets that can be put in terms of offer proposals.
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The Zoe API supports the following objects:
| Object | Description |
|---|---|
| Zoe Service | Deploys and works with smart contracts. |
| UserSeat | Used outside contracts to access or manipulate offers. |
| Zoe Contract Facet | Accesses a running contract instance. |
| ZCFSeat | Used within contracts to access or manipulate offers. |
| ZCFMint | Used by a contract to issue digital assets. |
| Price Authority | Gives quotes for prices. |
The Zoe API provides the following libraries:
| Library | Description |
|---|---|
| ZoeHelpers | Functions that extract common contract code and patterns into reusable helpers. |
| Ratio Math | Functions that let you create and manipulate Ratios. |
The Zoe API introduces and uses the following data types:
| Data Type | Description |
|---|---|
| Allocation | The Amounts to be paid out to each seat upon exiting an Offer. |
| AmountKeywordRecord | A record in which the property names are Keywords and the values are Amounts. |
| Handle | A Far object without any methods whose only useful property is its unique identity. |
| Instance | A handle to an opaque object that represents a contract instance. |
| Invitation | A non-fungible eright that can be held in Payments or Purses, just like any other eright. |
| InvitationIssuer | An Issuer for Invitations, which grant the right to participate in a contract. |
| Keyword | An ASCII identifier string that must begin with an upper case letter. |
| MutableQuote | Statement from a PriceAuthority as to the current price level at a particular time when multiple calls, replacing the trigger value, are expected. |
| ParsableNumber | Defined as a bigint, number, or string. |
| PriceQuote | Statement from a PriceAuthority as to the current price level at a particular time when only a single calls is expected. |
| Ratio | Pass-by-value record that consists of a numerator Amount and a denominator Amount. |
| TransferPart | Allocation changes for one or two existing ZCFSeats. TransferParts are the individual elements of the transfer array passed into the atomicRearrange() function. |