How to send value in an external contract call with Vyper

Vyper supports parameters for setting both gas and value in your function calls to external contracts. This is provided via thevalue= and gas= kwargs.

For example, here’s one way to call a function on a Uniswap exchange and send value (note: you’ll need to create an interface to reference the external contract first).

If you need to cast your value into wei, there’s the as_wei_value built-in function:

FYI, these code examples use vyper version: 0.1.0b10

Happy coding! Leave a comment if you have any thoughts or questions.