sendgrid

[progrium]

https://github.com/APIs-guru/openapi-directory/blob/main/APIs/sendgrid.com/1.0.0/openapi.yaml

[lritter79]

Twilio Version from their archived repo: https://github.com/sendgrid/sendgrid-oai/blob/main/oai.yaml

[progrium]

Looks pretty equivalent, I'm guessing apis-guru made it openapi 3.0 compatible and otherwise left it as is. Either should work, but in cases where they're this close, I think I'm preferring the apis-guru version.