Mhairi
March 2, 2022, 2:01pm
1
The DVM should support price requests for a CONSTANT price identifier. CONSTANT will always return the value, that is specified in the ancillary data passed along with the price request, or default to a value of “1” if no ancillary data is used.
# Headers
| UMIP-83 | |
|---------|-|
| UMIP Title | Add CONSTANT as a price identifier |
| Authors | Sean Brown (@smb2796) |
| Status | Approved |
| Created | 04/21/21 |
| [Discourse](https://discourse.uma.xyz/t/add-constant-price-identifier/1018) | |
# Summary
The DVM should support price requests for a CONSTANT price identifier. CONSTANT will always return the value, that is specified in the ancillary data passed along with the price request, or default to a value of "1" if no ancillary data is used.
# Motivation
For some financial products, it is useful to have a price identifier that simply returns a constant number. As an example, UMA's KPI options always need to be worth 2 UMA before expiry. This can also be accomplished in other ways - like using a financial product library - but for some contract deployers it may be easier to not need to deploy a custom library and instead just set their price by using this price identifier.
This constant identifier will also be the first price identifier to reference ancillary data.
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